From a5c14044ba4bb0c35f79e376373113d9da8e5708 Mon Sep 17 00:00:00 2001 From: Jan Eitzinger Date: Fri, 27 Mar 2026 07:01:00 +0100 Subject: [PATCH] Checkpoint: 3f4d366b037c Entire-Session: be491009-4de6-4152-bb5c-e5bb34ff496e Entire-Strategy: manual-commit Entire-Agent: Claude Code Ephemeral-branch: entire/71fc9ef-e3b0c4 --- 3f/4d366b037c/0/content_hash.txt | 1 + 3f/4d366b037c/0/full.jsonl | 117 +++++++++++++++++++++++++++++++ 3f/4d366b037c/0/metadata.json | 35 +++++++++ 3f/4d366b037c/metadata.json | 27 +++++++ 4 files changed, 180 insertions(+) create mode 100644 3f/4d366b037c/0/content_hash.txt create mode 100644 3f/4d366b037c/0/full.jsonl create mode 100644 3f/4d366b037c/0/metadata.json create mode 100644 3f/4d366b037c/metadata.json diff --git a/3f/4d366b037c/0/content_hash.txt b/3f/4d366b037c/0/content_hash.txt new file mode 100644 index 00000000..4f76121d --- /dev/null +++ b/3f/4d366b037c/0/content_hash.txt @@ -0,0 +1 @@ +sha256:ef6b71f45879127fb47970d704d6fb0caf034595a0ce8f2e8c6e2e47b7c6c004 \ No newline at end of file diff --git a/3f/4d366b037c/0/full.jsonl b/3f/4d366b037c/0/full.jsonl new file mode 100644 index 00000000..f6336d88 --- /dev/null +++ b/3f/4d366b037c/0/full.jsonl @@ -0,0 +1,117 @@ +{"type":"file-history-snapshot","messageId":"bb5f87e3-8441-4923-a8f8-bd65d5319e3d","snapshot":{"messageId":"bb5f87e3-8441-4923-a8f8-bd65d5319e3d","trackedFileBackups":{},"timestamp":"2026-03-27T05:49:00.537Z"},"isSnapshotUpdate":false} +{"parentUuid":null,"isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"SessionStart","hookName":"SessionStart:clear","command":"entire hooks claude-code session-start"},"parentToolUseID":"bc79d927-5f1f-47cf-9b64-0244bcff4ec6","toolUseID":"bc79d927-5f1f-47cf-9b64-0244bcff4ec6","timestamp":"2026-03-27T05:49:00.494Z","uuid":"e77be5ab-6b85-4f4e-9165-0ea766d7c355","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"e77be5ab-6b85-4f4e-9165-0ea766d7c355","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":"Implement the following plan:\n\n# Checkpoint Correctness Analysis (Updated Code)\n\n## Context\n\nAnalyzing data preservation when the application shuts down shortly after a periodic checkpoint. The shutdown checkpoint covers only a short duration (minutes), not the full retention period. On next startup, the system incorrectly assumes old checkpoint files will remain available indefinitely.\n\n---\n\n## Primary Bug: False assumption about checkpoint coverage after restart\n\n### The Problem\n\nThe shutdown checkpoint covers `[lastCheckpoint, shutdown_time]` — potentially just a few minutes. The rest of the retention window depends on older checkpoint files. After restart, the system sets `lastCheckpoint = time.Now()` and marks all loaded data as `archived: true`, effectively \"forgetting\" that old checkpoint files are the **only** persistent copy of most of the retention window. New periodic checkpoints only cover data from restart onward — they never re-persist the loaded data. When `CleanUp` eventually deletes the old files, data within the retention window is permanently lost from disk.\n\n### Root Cause\n\n**`checkpoint.go:95-96`** — `lastCheckpoint` set to restart time, not to the start of loaded data:\n```go\nlastCheckpoint = time.Now() // Should be restoreFrom instead\n```\n\n**`checkpoint.go:473`** — Loaded buffers marked as archived, preventing re-checkpointing:\n```go\narchived: true // Should be false so data gets re-persisted\n```\n\n**`checkpoint.go:280-291`** — `toCheckpointFile` skips all-archived metrics:\n```go\nif allArchived {\n continue // Loaded data never re-checkpointed\n}\n```\n\n### Timeline Showing the Gap\n\n```\nRetention = 48h, CheckpointInterval = 12h\n\nT-12h: Periodic checkpoint → {T-12h}.bin [T-12h, T]\nT: Shutdown checkpoint → {T}.bin [T, T+5min] ← SHORT\nT+1h: Restart. Loads both files. lastCheckpoint = T+1h.\n All loaded buffers: archived=true\n\nT+13h: Checkpoint → {T+1h}.bin [T+1h, T+13h] ← only NEW data\n Old data [T-12h, T+5min]? SKIPPED (archived=true, from=T+1h)\n\nT+49h: CleanUp deletes {T-12h}.bin, {T}.bin, {T+1h}.bin\n Data [T-12h, T+13h] now ONLY in memory.\n CRASH → data permanently lost. 12h gap in retention window.\n```\n\n### Fix\n\n**`pkg/metricstore/metricstore.go`** — Pass `restoreFrom` to `Checkpointing()` so `lastCheckpoint` is initialized to the start of loaded data, not `time.Now()`.\n\n**`pkg/metricstore/checkpoint.go`**:\n1. `Checkpointing()`: Accept `restoreFrom` parameter, set `lastCheckpoint = restoreFrom`\n2. `loadFile()`: Set `archived: false` on loaded buffers (or remove the archived check from `toCheckpointFile`)\n\nThis ensures the first periodic checkpoint after restart re-persists the entire loaded retention window, creating new checkpoint files that replace the old ones before CleanUp deletes them.\n\n**Trade-off**: The first checkpoint after restart will be larger (covers full retention window instead of just 12h). This is acceptable — it's a one-time cost for data safety.\n\n---\n\n## Secondary Bugs\n\n### Bug 2: Partial checkpoint failure doesn't update `lastCheckpoint` (Medium)\n\n**File**: `checkpoint.go:128-139`\n\nWhen `ToCheckpointWAL` returns an error (some hosts failed), `lastCheckpoint` is not updated. Next checkpoint re-writes ALL hosts from the old `from` time. WAL deletion per-host inside workers (line 699-703) partially mitigates WAL growth, but redundant snapshot writes remain.\n\n### Bug 3: JSON format non-atomic writes (Low)\n\n**File**: `checkpoint.go:340-358`\n\nJSON checkpoints write directly to final filename without temp+rename. Binary format correctly uses `.bin.tmp` + `os.Rename`. Crash during JSON write can corrupt the file.\n\n### Bug 4: CleanUp uses `from` timestamp for age, not `to` (Low)\n\n**File**: `archive.go:66` via `findFiles(entries, from, false)`\n\nFiles named `{from}.bin` are deleted when `from <= now - retention`. But a file covering [T-12h, T] contains data up to T. If T is still within retention but T-12h is not, the file is deleted prematurely. This widens the gap from Bug 1.\n\n---\n\n## Resolved Issues (fixed in current code vs. initial analysis)\n\n| Issue | Fix |\n|-------|-----|\n| WAL goroutines not awaited during Shutdown | `WaitForWALStagingDrain()` at `metricstore.go:294` |\n| WAL file deletion separated from checkpoint success | Per-host inside `ToCheckpointWAL` workers (`walCheckpoint.go:699-703`) |\n| Send-on-closed-channel panic | `walShuttingDown` atomic bool (`walCheckpoint.go:100`) |\n| `RotateWALFiles` could deadlock | Non-blocking sends + 30s timeout (`walCheckpoint.go:338-353`) |\n\n\nIf you need specific details from before exiting plan mode (like exact code snippets, error messages, or content you generated), read the full transcript at: /Users/jan/.claude/projects/-Users-jan-tmp-cc-backend/c8e0adf0-46c9-4661-bee9-670810ce1e34.jsonl"},"uuid":"bb5f87e3-8441-4923-a8f8-bd65d5319e3d","timestamp":"2026-03-27T05:49:00.270Z","planContent":"# Checkpoint Correctness Analysis (Updated Code)\n\n## Context\n\nAnalyzing data preservation when the application shuts down shortly after a periodic checkpoint. The shutdown checkpoint covers only a short duration (minutes), not the full retention period. On next startup, the system incorrectly assumes old checkpoint files will remain available indefinitely.\n\n---\n\n## Primary Bug: False assumption about checkpoint coverage after restart\n\n### The Problem\n\nThe shutdown checkpoint covers `[lastCheckpoint, shutdown_time]` — potentially just a few minutes. The rest of the retention window depends on older checkpoint files. After restart, the system sets `lastCheckpoint = time.Now()` and marks all loaded data as `archived: true`, effectively \"forgetting\" that old checkpoint files are the **only** persistent copy of most of the retention window. New periodic checkpoints only cover data from restart onward — they never re-persist the loaded data. When `CleanUp` eventually deletes the old files, data within the retention window is permanently lost from disk.\n\n### Root Cause\n\n**`checkpoint.go:95-96`** — `lastCheckpoint` set to restart time, not to the start of loaded data:\n```go\nlastCheckpoint = time.Now() // Should be restoreFrom instead\n```\n\n**`checkpoint.go:473`** — Loaded buffers marked as archived, preventing re-checkpointing:\n```go\narchived: true // Should be false so data gets re-persisted\n```\n\n**`checkpoint.go:280-291`** — `toCheckpointFile` skips all-archived metrics:\n```go\nif allArchived {\n continue // Loaded data never re-checkpointed\n}\n```\n\n### Timeline Showing the Gap\n\n```\nRetention = 48h, CheckpointInterval = 12h\n\nT-12h: Periodic checkpoint → {T-12h}.bin [T-12h, T]\nT: Shutdown checkpoint → {T}.bin [T, T+5min] ← SHORT\nT+1h: Restart. Loads both files. lastCheckpoint = T+1h.\n All loaded buffers: archived=true\n\nT+13h: Checkpoint → {T+1h}.bin [T+1h, T+13h] ← only NEW data\n Old data [T-12h, T+5min]? SKIPPED (archived=true, from=T+1h)\n\nT+49h: CleanUp deletes {T-12h}.bin, {T}.bin, {T+1h}.bin\n Data [T-12h, T+13h] now ONLY in memory.\n CRASH → data permanently lost. 12h gap in retention window.\n```\n\n### Fix\n\n**`pkg/metricstore/metricstore.go`** — Pass `restoreFrom` to `Checkpointing()` so `lastCheckpoint` is initialized to the start of loaded data, not `time.Now()`.\n\n**`pkg/metricstore/checkpoint.go`**:\n1. `Checkpointing()`: Accept `restoreFrom` parameter, set `lastCheckpoint = restoreFrom`\n2. `loadFile()`: Set `archived: false` on loaded buffers (or remove the archived check from `toCheckpointFile`)\n\nThis ensures the first periodic checkpoint after restart re-persists the entire loaded retention window, creating new checkpoint files that replace the old ones before CleanUp deletes them.\n\n**Trade-off**: The first checkpoint after restart will be larger (covers full retention window instead of just 12h). This is acceptable — it's a one-time cost for data safety.\n\n---\n\n## Secondary Bugs\n\n### Bug 2: Partial checkpoint failure doesn't update `lastCheckpoint` (Medium)\n\n**File**: `checkpoint.go:128-139`\n\nWhen `ToCheckpointWAL` returns an error (some hosts failed), `lastCheckpoint` is not updated. Next checkpoint re-writes ALL hosts from the old `from` time. WAL deletion per-host inside workers (line 699-703) partially mitigates WAL growth, but redundant snapshot writes remain.\n\n### Bug 3: JSON format non-atomic writes (Low)\n\n**File**: `checkpoint.go:340-358`\n\nJSON checkpoints write directly to final filename without temp+rename. Binary format correctly uses `.bin.tmp` + `os.Rename`. Crash during JSON write can corrupt the file.\n\n### Bug 4: CleanUp uses `from` timestamp for age, not `to` (Low)\n\n**File**: `archive.go:66` via `findFiles(entries, from, false)`\n\nFiles named `{from}.bin` are deleted when `from <= now - retention`. But a file covering [T-12h, T] contains data up to T. If T is still within retention but T-12h is not, the file is deleted prematurely. This widens the gap from Bug 1.\n\n---\n\n## Resolved Issues (fixed in current code vs. initial analysis)\n\n| Issue | Fix |\n|-------|-----|\n| WAL goroutines not awaited during Shutdown | `WaitForWALStagingDrain()` at `metricstore.go:294` |\n| WAL file deletion separated from checkpoint success | Per-host inside `ToCheckpointWAL` workers (`walCheckpoint.go:699-703`) |\n| Send-on-closed-channel panic | `walShuttingDown` atomic bool (`walCheckpoint.go:100`) |\n| `RotateWALFiles` could deadlock | Non-blocking sends + 30s timeout (`walCheckpoint.go:338-353`) |\n","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"type":"custom-title","customTitle":"checkpoint-coverage-bug-fix","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e"} +{"type":"agent-name","agentName":"checkpoint-coverage-bug-fix","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e"} 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This file is part of cc-backend.\n 3→// Use of this source code is governed by a MIT-style\n 4→// license that can be found in the LICENSE file.\n 5→\n 6→// This file implements checkpoint persistence for the in-memory metric store.\n 7→//\n 8→// Checkpoints enable graceful restarts by periodically saving in-memory metric\n 9→// data to disk in JSON or binary format. The checkpoint system:\n 10→//\n 11→// Key Features:\n 12→// - Periodic background checkpointing via the Checkpointing() worker\n 13→// - Two format families: JSON (human-readable) and WAL+binary (compact, crash-safe)\n 14→// - Parallel checkpoint creation and loading using worker pools\n 15→// - Hierarchical file organization: checkpoint_dir/cluster/host/timestamp.{json|bin}\n 16→// - WAL file: checkpoint_dir/cluster/host/current.wal (append-only, per-entry)\n 17→// - Only saves unarchived data (archived data is already persisted elsewhere)\n 18→// - GC optimization during loading to prevent excessive heap growth\n 19→//\n 20→// Checkpoint Workflow:\n 21→// 1. Init() loads checkpoints within retention window at startup\n 22→// 2. Checkpointing() worker periodically saves new data\n 23→// 3. Shutdown() writes final checkpoint before exit\n 24→//\n 25→// File Organization:\n 26→//\n 27→//\tcheckpoints/\n 28→//\t cluster1/\n 29→//\t host001/\n 30→//\t 1234567890.json (JSON format: full subtree snapshot)\n 31→//\t 1234567890.bin (binary format: full subtree snapshot)\n 32→//\t current.wal (WAL format: append-only per-entry log)\n 33→//\t host002/\n 34→//\t ...\n 35→package metricstore\n 36→\n 37→import (\n 38→\t\"bufio\"\n 39→\t\"context\"\n 40→\t\"encoding/json\"\n 41→\t\"errors\"\n 42→\t\"fmt\"\n 43→\t\"io/fs\"\n 44→\t\"os\"\n 45→\t\"path\"\n 46→\t\"path/filepath\"\n 47→\t\"sort\"\n 48→\t\"strconv\"\n 49→\t\"strings\"\n 50→\t\"sync\"\n 51→\t\"sync/atomic\"\n 52→\t\"time\"\n 53→\n 54→\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n 55→\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n 56→)\n 57→\n 58→const (\n 59→\tCheckpointFilePerms = 0o644 // File permissions for checkpoint files\n 60→\tCheckpointDirPerms = 0o755 // Directory permissions for checkpoint directories\n 61→\tGCTriggerInterval = DefaultGCTriggerInterval // Interval for triggering GC during checkpoint loading\n 62→)\n 63→\n 64→// CheckpointMetrics represents metric data in a checkpoint file.\n 65→// Whenever the structure changes, update MarshalJSON as well!\n 66→type CheckpointMetrics struct {\n 67→\tData []schema.Float `json:\"data\"`\n 68→\tFrequency int64 `json:\"frequency\"`\n 69→\tStart int64 `json:\"start\"`\n 70→}\n 71→\n 72→// CheckpointFile represents the hierarchical structure of a checkpoint file.\n 73→// It mirrors the Level tree structure from the MemoryStore.\n 74→type CheckpointFile struct {\n 75→\tMetrics map[string]*CheckpointMetrics `json:\"metrics\"`\n 76→\tChildren map[string]*CheckpointFile `json:\"children\"`\n 77→\tFrom int64 `json:\"from\"`\n 78→\tTo int64 `json:\"to\"`\n 79→}\n 80→\n 81→// lastCheckpoint tracks the timestamp of the last checkpoint creation.\n 82→var (\n 83→\tlastCheckpoint time.Time\n 84→\tlastCheckpointMu sync.Mutex\n 85→)\n 86→\n 87→// Checkpointing starts a background worker that periodically saves metric data to disk.\n 88→//\n 89→// Checkpoints are written every 12 hours (hardcoded).\n 90→//\n 91→// Format behaviour:\n 92→// - \"json\": Periodic checkpointing every checkpointInterval\n 93→// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\n 94→func Checkpointing(wg *sync.WaitGroup, ctx context.Context) {\n 95→\tlastCheckpointMu.Lock()\n 96→\tlastCheckpoint = time.Now()\n 97→\tlastCheckpointMu.Unlock()\n 98→\n 99→\tms := GetMemoryStore()\n 100→"}]},"uuid":"dfab3091-7acf-4285-8cf4-c1d7c299d365","timestamp":"2026-03-27T05:49:05.587Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","content":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// This file implements checkpoint persistence for the in-memory metric store.\n//\n// Checkpoints enable graceful restarts by periodically saving in-memory metric\n// data to disk in JSON or binary format. The checkpoint system:\n//\n// Key Features:\n// - Periodic background checkpointing via the Checkpointing() worker\n// - Two format families: JSON (human-readable) and WAL+binary (compact, crash-safe)\n// - Parallel checkpoint creation and loading using worker pools\n// - Hierarchical file organization: checkpoint_dir/cluster/host/timestamp.{json|bin}\n// - WAL file: checkpoint_dir/cluster/host/current.wal (append-only, per-entry)\n// - Only saves unarchived data (archived data is already persisted elsewhere)\n// - GC optimization during loading to prevent excessive heap growth\n//\n// Checkpoint Workflow:\n// 1. Init() loads checkpoints within retention window at startup\n// 2. Checkpointing() worker periodically saves new data\n// 3. Shutdown() writes final checkpoint before exit\n//\n// File Organization:\n//\n//\tcheckpoints/\n//\t cluster1/\n//\t host001/\n//\t 1234567890.json (JSON format: full subtree snapshot)\n//\t 1234567890.bin (binary format: full subtree snapshot)\n//\t current.wal (WAL format: append-only per-entry log)\n//\t host002/\n//\t ...\npackage metricstore\n\nimport (\n\t\"bufio\"\n\t\"context\"\n\t\"encoding/json\"\n\t\"errors\"\n\t\"fmt\"\n\t\"io/fs\"\n\t\"os\"\n\t\"path\"\n\t\"path/filepath\"\n\t\"sort\"\n\t\"strconv\"\n\t\"strings\"\n\t\"sync\"\n\t\"sync/atomic\"\n\t\"time\"\n\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n)\n\nconst (\n\tCheckpointFilePerms = 0o644 // File permissions for checkpoint files\n\tCheckpointDirPerms = 0o755 // Directory permissions for checkpoint directories\n\tGCTriggerInterval = DefaultGCTriggerInterval // Interval for triggering GC during checkpoint loading\n)\n\n// CheckpointMetrics represents metric data in a checkpoint file.\n// Whenever the structure changes, update MarshalJSON as well!\ntype CheckpointMetrics struct {\n\tData []schema.Float `json:\"data\"`\n\tFrequency int64 `json:\"frequency\"`\n\tStart int64 `json:\"start\"`\n}\n\n// CheckpointFile represents the hierarchical structure of a checkpoint file.\n// It mirrors the Level tree structure from the MemoryStore.\ntype CheckpointFile struct {\n\tMetrics map[string]*CheckpointMetrics `json:\"metrics\"`\n\tChildren map[string]*CheckpointFile `json:\"children\"`\n\tFrom int64 `json:\"from\"`\n\tTo int64 `json:\"to\"`\n}\n\n// lastCheckpoint tracks the timestamp of the last checkpoint creation.\nvar (\n\tlastCheckpoint time.Time\n\tlastCheckpointMu sync.Mutex\n)\n\n// Checkpointing starts a background worker that periodically saves metric data to disk.\n//\n// Checkpoints are written every 12 hours (hardcoded).\n//\n// Format behaviour:\n// - \"json\": Periodic checkpointing every checkpointInterval\n// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\nfunc Checkpointing(wg *sync.WaitGroup, ctx context.Context) {\n\tlastCheckpointMu.Lock()\n\tlastCheckpoint = time.Now()\n\tlastCheckpointMu.Unlock()\n\n\tms := GetMemoryStore()\n","numLines":100,"startLine":1,"totalLines":670}},"sourceToolAssistantUUID":"b0c5f333-760d-489f-a790-e77a6740fc95","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"dfab3091-7acf-4285-8cf4-c1d7c299d365","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_011zV5YHCmkiAp8fJuPw9bDv","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01HshKASKCFThDGy47p6xgzp","name":"Read","input":{"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/metricstore.go","limit":100},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":13060,"cache_read_input_tokens":6405,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":13060},"output_tokens":34,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4Rd6pGEZ1kWrQHvwBZ","type":"assistant","uuid":"c85adc86-b354-45e6-91e7-f966d31954a5","timestamp":"2026-03-27T05:49:06.014Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"c85adc86-b354-45e6-91e7-f966d31954a5","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01HshKASKCFThDGy47p6xgzp","toolUseID":"toolu_01HshKASKCFThDGy47p6xgzp","timestamp":"2026-03-27T05:49:06.037Z","uuid":"59048fb3-5591-4bd4-a5e1-8ec6cd06786a","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"c85adc86-b354-45e6-91e7-f966d31954a5","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01HshKASKCFThDGy47p6xgzp","type":"tool_result","content":" 1→// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n 2→// All rights reserved. This file is part of cc-backend.\n 3→// Use of this source code is governed by a MIT-style\n 4→// license that can be found in the LICENSE file.\n 5→\n 6→// Package metricstore provides an efficient in-memory time-series metric storage system\n 7→// with support for hierarchical data organization, checkpointing, and archiving.\n 8→//\n 9→// The package organizes metrics in a tree structure (cluster → host → component) and\n 10→// provides concurrent read/write access to metric data with configurable aggregation strategies.\n 11→// Background goroutines handle periodic checkpointing (JSON or Avro format), archiving old data,\n 12→// and enforcing retention policies.\n 13→//\n 14→// Key features:\n 15→// - In-memory metric storage with configurable retention\n 16→// - Hierarchical data organization (selectors)\n 17→// - Concurrent checkpoint/archive workers\n 18→// - Support for sum and average aggregation\n 19→// - NATS integration for metric ingestion\n 20→package metricstore\n 21→\n 22→import (\n 23→\t\"bytes\"\n 24→\t\"context\"\n 25→\t\"encoding/json\"\n 26→\t\"errors\"\n 27→\t\"fmt\"\n 28→\t\"runtime\"\n 29→\t\"runtime/debug\"\n 30→\t\"slices\"\n 31→\t\"sync\"\n 32→\t\"time\"\n 33→\n 34→\t\"github.com/ClusterCockpit/cc-backend/internal/config\"\n 35→\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n 36→\t\"github.com/ClusterCockpit/cc-lib/v2/resampler\"\n 37→\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n 38→\t\"github.com/ClusterCockpit/cc-lib/v2/util\"\n 39→)\n 40→\n 41→// GlobalState holds the global state for the metric store with thread-safe access.\n 42→type GlobalState struct {\n 43→\tmu sync.RWMutex\n 44→\tlastRetentionTime int64\n 45→\tselectorsExcluded bool\n 46→}\n 47→\n 48→var (\n 49→\tsingleton sync.Once\n 50→\tmsInstance *MemoryStore\n 51→\t// shutdownFunc stores the context cancellation function created in Init\n 52→\t// and is called during Shutdown to cancel all background goroutines\n 53→\tshutdownFunc context.CancelFunc\n 54→\tshutdownFuncMu sync.Mutex // Protects shutdownFunc from concurrent access\n 55→\t// Create a global instance\n 56→\tstate = &GlobalState{}\n 57→)\n 58→\n 59→// NodeProvider provides information about nodes currently in use by running jobs.\n 60→//\n 61→// This interface allows metricstore to query job information without directly\n 62→// depending on the repository package, breaking the import cycle.\n 63→//\n 64→// Implementations should return nodes that are actively processing jobs started\n 65→// before the given timestamp. These nodes will be excluded from retention-based\n 66→// garbage collection to prevent data loss for jobs that are still running or\n 67→// recently completed.\n 68→type NodeProvider interface {\n 69→\t// GetUsedNodes returns a map of cluster names to sorted lists of unique hostnames\n 70→\t// that are currently in use by jobs that started before the given timestamp.\n 71→\t//\n 72→\t// Parameters:\n 73→\t// - ts: Unix timestamp threshold - returns nodes with jobs started before this time\n 74→\t//\n 75→\t// Returns:\n 76→\t// - Map of cluster names to lists of node hostnames that should be excluded from garbage collection\n 77→\t// - Error if the query fails\n 78→\tGetUsedNodes(ts int64) (map[string][]string, error)\n 79→}\n 80→\n 81→// Metric represents a single metric data point to be written to the store.\n 82→type Metric struct {\n 83→\tName string\n 84→\tValue schema.Float\n 85→\t// MetricConfig contains frequency and aggregation settings for this metric.\n 86→\t// If Frequency is 0, configuration will be looked up from MemoryStore.Metrics during Write().\n 87→\tMetricConfig MetricConfig\n 88→}\n 89→\n 90→// MemoryStore is the main in-memory time-series metric storage implementation.\n 91→//\n 92→// It organizes metrics in a hierarchical tree structure where each level represents\n 93→// a component of the system hierarchy (e.g., cluster → host → CPU). Each level can\n 94→// store multiple metrics as time-series buffers.\n 95→//\n 96→// The store is initialized as a singleton via InitMetrics() and accessed via GetMemoryStore().\n 97→// All public methods are safe for concurrent use.\n 98→type MemoryStore struct {\n 99→\tMetrics map[string]MetricConfig\n 100→\troot Level"}]},"uuid":"e530e7f1-7f03-4811-9c77-f56c06ca3f49","timestamp":"2026-03-27T05:49:06.037Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/metricstore.go","content":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// Package metricstore provides an efficient in-memory time-series metric storage system\n// with support for hierarchical data organization, checkpointing, and archiving.\n//\n// The package organizes metrics in a tree structure (cluster → host → component) and\n// provides concurrent read/write access to metric data with configurable aggregation strategies.\n// Background goroutines handle periodic checkpointing (JSON or Avro format), archiving old data,\n// and enforcing retention policies.\n//\n// Key features:\n// - In-memory metric storage with configurable retention\n// - Hierarchical data organization (selectors)\n// - Concurrent checkpoint/archive workers\n// - Support for sum and average aggregation\n// - NATS integration for metric ingestion\npackage metricstore\n\nimport (\n\t\"bytes\"\n\t\"context\"\n\t\"encoding/json\"\n\t\"errors\"\n\t\"fmt\"\n\t\"runtime\"\n\t\"runtime/debug\"\n\t\"slices\"\n\t\"sync\"\n\t\"time\"\n\n\t\"github.com/ClusterCockpit/cc-backend/internal/config\"\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/resampler\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/util\"\n)\n\n// GlobalState holds the global state for the metric store with thread-safe access.\ntype GlobalState struct {\n\tmu sync.RWMutex\n\tlastRetentionTime int64\n\tselectorsExcluded bool\n}\n\nvar (\n\tsingleton sync.Once\n\tmsInstance *MemoryStore\n\t// shutdownFunc stores the context cancellation function created in Init\n\t// and is called during Shutdown to cancel all background goroutines\n\tshutdownFunc context.CancelFunc\n\tshutdownFuncMu sync.Mutex // Protects shutdownFunc from concurrent access\n\t// Create a global instance\n\tstate = &GlobalState{}\n)\n\n// NodeProvider provides information about nodes currently in use by running jobs.\n//\n// This interface allows metricstore to query job information without directly\n// depending on the repository package, breaking the import cycle.\n//\n// Implementations should return nodes that are actively processing jobs started\n// before the given timestamp. These nodes will be excluded from retention-based\n// garbage collection to prevent data loss for jobs that are still running or\n// recently completed.\ntype NodeProvider interface {\n\t// GetUsedNodes returns a map of cluster names to sorted lists of unique hostnames\n\t// that are currently in use by jobs that started before the given timestamp.\n\t//\n\t// Parameters:\n\t// - ts: Unix timestamp threshold - returns nodes with jobs started before this time\n\t//\n\t// Returns:\n\t// - Map of cluster names to lists of node hostnames that should be excluded from garbage collection\n\t// - Error if the query fails\n\tGetUsedNodes(ts int64) (map[string][]string, error)\n}\n\n// Metric represents a single metric data point to be written to the store.\ntype Metric struct {\n\tName string\n\tValue schema.Float\n\t// MetricConfig contains frequency and aggregation settings for this metric.\n\t// If Frequency is 0, configuration will be looked up from MemoryStore.Metrics during Write().\n\tMetricConfig MetricConfig\n}\n\n// MemoryStore is the main in-memory time-series metric storage implementation.\n//\n// It organizes metrics in a hierarchical tree structure where each level represents\n// a component of the system hierarchy (e.g., cluster → host → CPU). Each level can\n// store multiple metrics as time-series buffers.\n//\n// The store is initialized as a singleton via InitMetrics() and accessed via GetMemoryStore().\n// All public methods are safe for concurrent use.\ntype MemoryStore struct {\n\tMetrics map[string]MetricConfig\n\troot Level","numLines":100,"startLine":1,"totalLines":814}},"sourceToolAssistantUUID":"c85adc86-b354-45e6-91e7-f966d31954a5","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"e530e7f1-7f03-4811-9c77-f56c06ca3f49","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_011zV5YHCmkiAp8fJuPw9bDv","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_012Gup5GbTYXLGhmQuBCTLkS","name":"Read","input":{"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/archive.go","limit":100},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":13060,"cache_read_input_tokens":6405,"output_tokens":277,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":13060,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4Rd6pGEZ1kWrQHvwBZ","type":"assistant","uuid":"4502be71-c4cf-42e4-af6c-882a071fc8bc","timestamp":"2026-03-27T05:49:06.461Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"4502be71-c4cf-42e4-af6c-882a071fc8bc","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_012Gup5GbTYXLGhmQuBCTLkS","toolUseID":"toolu_012Gup5GbTYXLGhmQuBCTLkS","timestamp":"2026-03-27T05:49:06.477Z","uuid":"59b05f59-dd36-4ac5-be57-53091c7a7b3a","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"4502be71-c4cf-42e4-af6c-882a071fc8bc","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_012Gup5GbTYXLGhmQuBCTLkS","type":"tool_result","content":" 1→// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n 2→// All rights reserved. This file is part of cc-backend.\n 3→// Use of this source code is governed by a MIT-style\n 4→// license that can be found in the LICENSE file.\n 5→\n 6→package metricstore\n 7→\n 8→import (\n 9→\t\"context\"\n 10→\t\"errors\"\n 11→\t\"fmt\"\n 12→\t\"os\"\n 13→\t\"path/filepath\"\n 14→\t\"strings\"\n 15→\t\"sync\"\n 16→\t\"sync/atomic\"\n 17→\t\"time\"\n 18→\n 19→\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n 20→)\n 21→\n 22→// Worker for either Archiving or Deleting files\n 23→\n 24→func CleanUp(wg *sync.WaitGroup, ctx context.Context) {\n 25→\tif Keys.Cleanup.Mode == \"archive\" {\n 26→\t\tcclog.Info(\"[METRICSTORE]> enable archive cleanup to parquet\")\n 27→\t\t// Run as Archiver\n 28→\t\tcleanUpWorker(wg, ctx,\n 29→\t\t\tKeys.RetentionInMemory,\n 30→\t\t\t\"archiving\",\n 31→\t\t\tKeys.Cleanup.RootDir,\n 32→\t\t\tfalse,\n 33→\t\t)\n 34→\t} else {\n 35→\t\t// Run as Deleter\n 36→\t\tcleanUpWorker(wg, ctx,\n 37→\t\t\tKeys.RetentionInMemory,\n 38→\t\t\t\"deleting\",\n 39→\t\t\t\"\",\n 40→\t\t\ttrue,\n 41→\t\t)\n 42→\t}\n 43→}\n 44→\n 45→// cleanUpWorker takes simple values to configure what it does\n 46→func cleanUpWorker(wg *sync.WaitGroup, ctx context.Context, interval string, mode string, cleanupDir string, delete bool) {\n 47→\twg.Go(func() {\n 48→\t\td, err := time.ParseDuration(interval)\n 49→\t\tif err != nil {\n 50→\t\t\tcclog.Fatalf(\"[METRICSTORE]> error parsing %s interval duration: %v\\n\", mode, err)\n 51→\t\t}\n 52→\t\tif d <= 0 {\n 53→\t\t\treturn\n 54→\t\t}\n 55→\n 56→\t\tticker := time.NewTicker(d)\n 57→\t\tdefer ticker.Stop()\n 58→\n 59→\t\tfor {\n 60→\t\t\tselect {\n 61→\t\t\tcase <-ctx.Done():\n 62→\t\t\t\treturn\n 63→\t\t\tcase <-ticker.C:\n 64→\t\t\t\tt := time.Now().Add(-d)\n 65→\t\t\t\tcclog.Infof(\"[METRICSTORE]> start %s checkpoints (older than %s)...\", mode, t.Format(time.RFC3339))\n 66→\n 67→\t\t\t\tn, err := CleanupCheckpoints(Keys.Checkpoints.RootDir, cleanupDir, t.Unix(), delete)\n 68→\n 69→\t\t\t\tif err != nil {\n 70→\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> %s failed: %s\", mode, err.Error())\n 71→\t\t\t\t} else {\n 72→\t\t\t\t\tif delete {\n 73→\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoints deleted\", n)\n 74→\t\t\t\t\t} else {\n 75→\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files archived to parquet\", n)\n 76→\t\t\t\t\t}\n 77→\t\t\t\t}\n 78→\t\t\t}\n 79→\t\t}\n 80→\t})\n 81→}\n 82→\n 83→var ErrNoNewArchiveData error = errors.New(\"all data already archived\")\n 84→\n 85→// CleanupCheckpoints deletes or archives all checkpoint files older than `from`.\n 86→// When archiving, consolidates all hosts per cluster into a single Parquet file.\n 87→func CleanupCheckpoints(checkpointsDir, cleanupDir string, from int64, deleteInstead bool) (int, error) {\n 88→\tif deleteInstead {\n 89→\t\treturn deleteCheckpoints(checkpointsDir, from)\n 90→\t}\n 91→\n 92→\treturn archiveCheckpoints(checkpointsDir, cleanupDir, from)\n 93→}\n 94→\n 95→// deleteCheckpoints removes checkpoint files older than `from` across all clusters/hosts.\n 96→func deleteCheckpoints(checkpointsDir string, from int64) (int, error) {\n 97→\tentries1, err := os.ReadDir(checkpointsDir)\n 98→\tif err != nil {\n 99→\t\treturn 0, err\n 100→\t}"}]},"uuid":"27f9be12-f344-4cd0-a96f-c01b1b8b2eac","timestamp":"2026-03-27T05:49:06.476Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/archive.go","content":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\npackage metricstore\n\nimport (\n\t\"context\"\n\t\"errors\"\n\t\"fmt\"\n\t\"os\"\n\t\"path/filepath\"\n\t\"strings\"\n\t\"sync\"\n\t\"sync/atomic\"\n\t\"time\"\n\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n)\n\n// Worker for either Archiving or Deleting files\n\nfunc CleanUp(wg *sync.WaitGroup, ctx context.Context) {\n\tif Keys.Cleanup.Mode == \"archive\" {\n\t\tcclog.Info(\"[METRICSTORE]> enable archive cleanup to parquet\")\n\t\t// Run as Archiver\n\t\tcleanUpWorker(wg, ctx,\n\t\t\tKeys.RetentionInMemory,\n\t\t\t\"archiving\",\n\t\t\tKeys.Cleanup.RootDir,\n\t\t\tfalse,\n\t\t)\n\t} else {\n\t\t// Run as Deleter\n\t\tcleanUpWorker(wg, ctx,\n\t\t\tKeys.RetentionInMemory,\n\t\t\t\"deleting\",\n\t\t\t\"\",\n\t\t\ttrue,\n\t\t)\n\t}\n}\n\n// cleanUpWorker takes simple values to configure what it does\nfunc cleanUpWorker(wg *sync.WaitGroup, ctx context.Context, interval string, mode string, cleanupDir string, delete bool) {\n\twg.Go(func() {\n\t\td, err := time.ParseDuration(interval)\n\t\tif err != nil {\n\t\t\tcclog.Fatalf(\"[METRICSTORE]> error parsing %s interval duration: %v\\n\", mode, err)\n\t\t}\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tt := time.Now().Add(-d)\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start %s checkpoints (older than %s)...\", mode, t.Format(time.RFC3339))\n\n\t\t\t\tn, err := CleanupCheckpoints(Keys.Checkpoints.RootDir, cleanupDir, t.Unix(), delete)\n\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> %s failed: %s\", mode, err.Error())\n\t\t\t\t} else {\n\t\t\t\t\tif delete {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoints deleted\", n)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files archived to parquet\", n)\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}\n\nvar ErrNoNewArchiveData error = errors.New(\"all data already archived\")\n\n// CleanupCheckpoints deletes or archives all checkpoint files older than `from`.\n// When archiving, consolidates all hosts per cluster into a single Parquet file.\nfunc CleanupCheckpoints(checkpointsDir, cleanupDir string, from int64, deleteInstead bool) (int, error) {\n\tif deleteInstead {\n\t\treturn deleteCheckpoints(checkpointsDir, from)\n\t}\n\n\treturn archiveCheckpoints(checkpointsDir, cleanupDir, from)\n}\n\n// deleteCheckpoints removes checkpoint files older than `from` across all clusters/hosts.\nfunc deleteCheckpoints(checkpointsDir string, from int64) (int, error) {\n\tentries1, err := os.ReadDir(checkpointsDir)\n\tif err != nil {\n\t\treturn 0, err\n\t}","numLines":100,"startLine":1,"totalLines":343}},"sourceToolAssistantUUID":"4502be71-c4cf-42e4-af6c-882a071fc8bc","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} 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+{"parentUuid":"7a5e77a6-71ea-43c4-b23d-a6cefda6723b","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_014xGfPPKiYzvQxRVw9VAbvz","toolUseID":"toolu_014xGfPPKiYzvQxRVw9VAbvz","timestamp":"2026-03-27T05:49:11.089Z","uuid":"39a0e5f5-5a2a-4142-9dda-c1d736e27ab7","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"7a5e77a6-71ea-43c4-b23d-a6cefda6723b","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_014xGfPPKiYzvQxRVw9VAbvz","type":"tool_result","content":" 87→// Checkpointing starts a background worker that periodically saves metric data to disk.\n 88→//\n 89→// Checkpoints are written every 12 hours (hardcoded).\n 90→//\n 91→// Format behaviour:\n 92→// - \"json\": Periodic checkpointing every checkpointInterval\n 93→// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\n 94→func Checkpointing(wg *sync.WaitGroup, ctx context.Context) {\n 95→\tlastCheckpointMu.Lock()\n 96→\tlastCheckpoint = time.Now()\n 97→\tlastCheckpointMu.Unlock()\n 98→\n 99→\tms := GetMemoryStore()\n 100→\n 101→\twg.Go(func() {\n 102→\n 103→\t\td := 12 * time.Hour // default checkpoint interval\n 104→\t\tif Keys.CheckpointInterval != \"\" {\n 105→\t\t\tparsed, err := time.ParseDuration(Keys.CheckpointInterval)\n 106→\t\t\tif err != nil {\n 107→\t\t\t\tcclog.Errorf(\"[METRICSTORE]> invalid checkpoint-interval %q: %s, using default 12h\", Keys.CheckpointInterval, err)\n 108→\t\t\t} else {\n 109→\t\t\t\td = parsed\n 110→\t\t\t}\n 111→\t\t}\n 112→\n 113→\t\tticker := time.NewTicker(d)\n 114→\t\tdefer ticker.Stop()\n 115→\n 116→\t\tfor {\n 117→\t\t\tselect {\n 118→\t\t\tcase <-ctx.Done():\n 119→\t\t\t\treturn\n 120→\t\t\tcase <-ticker.C:\n 121→\t\t\t\tlastCheckpointMu.Lock()\n 122→\t\t\t\tfrom := lastCheckpoint\n 123→\t\t\t\tlastCheckpointMu.Unlock()\n 124→\n 125→\t\t\t\tnow := time.Now()\n 126→\t\t\t\tcclog.Infof(\"[METRICSTORE]> start checkpointing (starting at %s)...\", from.Format(time.RFC3339))\n 127→\n 128→\t\t\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n 129→\t\t\t\t\tn, hostDirs, err := ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n 130→\t\t\t\t\tif err != nil {\n 131→\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> binary checkpointing failed: %s\", err.Error())\n 132→\t\t\t\t\t} else {\n 133→\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d binary snapshot files created\", n)\n 134→\t\t\t\t\t\tlastCheckpointMu.Lock()\n 135→\t\t\t\t\t\tlastCheckpoint = now\n 136→\t\t\t\t\t\tlastCheckpointMu.Unlock()\n 137→\t\t\t\t\t\t// Rotate WAL files for successfully checkpointed hosts.\n 138→\t\t\t\t\t\tRotateWALFiles(hostDirs)\n 139→\t\t\t\t\t}\n 140→\t\t\t\t} else {\n 141→\t\t\t\t\tn, err := ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n 142→\t\t\t\t\tif err != nil {\n 143→\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> checkpointing failed: %s\", err.Error())\n 144→\t\t\t\t\t} else {\n 145→\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files created\", n)\n 146→\t\t\t\t\t\tlastCheckpointMu.Lock()\n 147→\t\t\t\t\t\tlastCheckpoint = now\n 148→\t\t\t\t\t\tlastCheckpointMu.Unlock()\n 149→\t\t\t\t\t}\n 150→\t\t\t\t}\n 151→\t\t\t}\n 152→\t\t}\n 153→\t})\n 154→}\n 155→\n 156→// MarshalJSON provides optimized JSON encoding for CheckpointMetrics.\n 157→//\n 158→// Since schema.Float has custom MarshalJSON, serializing []Float has significant overhead.\n 159→// This method manually constructs JSON to avoid allocations and interface conversions.\n 160→func (cm *CheckpointMetrics) MarshalJSON() ([]byte, error) {\n 161→\tbuf := make([]byte, 0, 128+len(cm.Data)*8)\n 162→\tbuf = append(buf, `{\"frequency\":`...)\n 163→\tbuf = strconv.AppendInt(buf, cm.Frequency, 10)\n 164→\tbuf = append(buf, `,\"start\":`...)\n 165→\tbuf = strconv.AppendInt(buf, cm.Start, 10)\n 166→\tbuf = append(buf, `,\"data\":[`...)"}]},"uuid":"141ceeec-58c7-44f9-8835-3e6eee598784","timestamp":"2026-03-27T05:49:11.089Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","content":"// Checkpointing starts a background worker that periodically saves metric data to disk.\n//\n// Checkpoints are written every 12 hours (hardcoded).\n//\n// Format behaviour:\n// - \"json\": Periodic checkpointing every checkpointInterval\n// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\nfunc Checkpointing(wg *sync.WaitGroup, ctx context.Context) {\n\tlastCheckpointMu.Lock()\n\tlastCheckpoint = time.Now()\n\tlastCheckpointMu.Unlock()\n\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\n\t\td := 12 * time.Hour // default checkpoint interval\n\t\tif Keys.CheckpointInterval != \"\" {\n\t\t\tparsed, err := time.ParseDuration(Keys.CheckpointInterval)\n\t\t\tif err != nil {\n\t\t\t\tcclog.Errorf(\"[METRICSTORE]> invalid checkpoint-interval %q: %s, using default 12h\", Keys.CheckpointInterval, err)\n\t\t\t} else {\n\t\t\t\td = parsed\n\t\t\t}\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\tfrom := lastCheckpoint\n\t\t\t\tlastCheckpointMu.Unlock()\n\n\t\t\t\tnow := time.Now()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start checkpointing (starting at %s)...\", from.Format(time.RFC3339))\n\n\t\t\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\t\t\t\tn, hostDirs, err := ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> binary checkpointing failed: %s\", err.Error())\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d binary snapshot files created\", n)\n\t\t\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\t\t\tlastCheckpoint = now\n\t\t\t\t\t\tlastCheckpointMu.Unlock()\n\t\t\t\t\t\t// Rotate WAL files for successfully checkpointed hosts.\n\t\t\t\t\t\tRotateWALFiles(hostDirs)\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\tn, err := ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> checkpointing failed: %s\", err.Error())\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files created\", n)\n\t\t\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\t\t\tlastCheckpoint = now\n\t\t\t\t\t\tlastCheckpointMu.Unlock()\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}\n\n// MarshalJSON provides optimized JSON encoding for CheckpointMetrics.\n//\n// Since schema.Float has custom MarshalJSON, serializing []Float has significant overhead.\n// This method manually constructs JSON to avoid allocations and interface conversions.\nfunc (cm *CheckpointMetrics) MarshalJSON() ([]byte, error) {\n\tbuf := make([]byte, 0, 128+len(cm.Data)*8)\n\tbuf = append(buf, `{\"frequency\":`...)\n\tbuf = strconv.AppendInt(buf, cm.Frequency, 10)\n\tbuf = append(buf, `,\"start\":`...)\n\tbuf = strconv.AppendInt(buf, cm.Start, 10)\n\tbuf = append(buf, `,\"data\":[`...)","numLines":80,"startLine":87,"totalLines":670}},"sourceToolAssistantUUID":"7a5e77a6-71ea-43c4-b23d-a6cefda6723b","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"141ceeec-58c7-44f9-8835-3e6eee598784","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_013vJuE44UCYFZWXcxH8qeY4","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01PEXr93ss3fs4aoDJp7V1jh","name":"Read","input":{"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/metricstore.go","offset":100,"limit":250},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":4837,"cache_read_input_tokens":19465,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":4837},"output_tokens":34,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4S3V1saLRtZ3oMoZJC","type":"assistant","uuid":"b0f2450d-2643-417a-9c6f-f6ccf7382948","timestamp":"2026-03-27T05:49:11.931Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"b0f2450d-2643-417a-9c6f-f6ccf7382948","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01PEXr93ss3fs4aoDJp7V1jh","toolUseID":"toolu_01PEXr93ss3fs4aoDJp7V1jh","timestamp":"2026-03-27T05:49:11.942Z","uuid":"f171c800-8fa6-4542-be46-05aed221b389","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"b0f2450d-2643-417a-9c6f-f6ccf7382948","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01PEXr93ss3fs4aoDJp7V1jh","type":"tool_result","content":" 100→\troot Level\n 101→\tnodeProvider NodeProvider\n 102→}\n 103→\n 104→// Init initializes the metric store from configuration and starts background workers.\n 105→//\n 106→// This function must be called exactly once before any other metricstore operations.\n 107→// It performs the following initialization steps:\n 108→// 1. Validates and decodes the metric store configuration\n 109→// 2. Configures worker pool size (defaults to NumCPU/2+1, max 10)\n 110→// 3. Loads metric configurations from all registered clusters\n 111→// 4. Restores checkpoints within the retention window\n 112→// 5. Starts background workers for retention, checkpointing, archiving, and monitoring\n 113→// 6. Optionally subscribes to NATS for real-time metric ingestion\n 114→//\n 115→// Parameters:\n 116→// - rawConfig: JSON configuration for the metric store (see MetricStoreConfig)\n 117→// - wg: WaitGroup that will be incremented for each background goroutine started\n 118→//\n 119→// The function will call cclog.Fatal on critical errors during initialization.\n 120→// Use Shutdown() to cleanly stop all background workers started by Init().\n 121→//\n 122→// Note: Signal handling must be implemented by the caller. Call Shutdown() when\n 123→// receiving termination signals to ensure checkpoint data is persisted.\n 124→func Init(rawConfig json.RawMessage, metrics map[string]MetricConfig, wg *sync.WaitGroup) {\n 125→\tstartupTime := time.Now()\n 126→\n 127→\tif rawConfig != nil {\n 128→\t\tconfig.Validate(configSchema, rawConfig)\n 129→\t\tdec := json.NewDecoder(bytes.NewReader(rawConfig))\n 130→\t\tdec.DisallowUnknownFields()\n 131→\t\tif err := dec.Decode(&Keys); err != nil {\n 132→\t\t\tcclog.Abortf(\"[METRICSTORE]> Metric Store Config Init: Could not decode config file '%s'.\\nError: %s\\n\", rawConfig, err.Error())\n 133→\t\t}\n 134→\t}\n 135→\n 136→\t// Set NumWorkers from config or use default\n 137→\tif Keys.NumWorkers <= 0 {\n 138→\t\tKeys.NumWorkers = min(runtime.NumCPU()/2+1, DefaultMaxWorkers)\n 139→\t}\n 140→\tcclog.Debugf(\"[METRICSTORE]> Using %d workers for checkpoint/archive operations\\n\", Keys.NumWorkers)\n 141→\n 142→\t// Pass the config.MetricStoreKeys\n 143→\tInitMetrics(metrics)\n 144→\n 145→\tms := GetMemoryStore()\n 146→\n 147→\td, err := time.ParseDuration(Keys.RetentionInMemory)\n 148→\tif err != nil {\n 149→\t\tcclog.Fatal(err)\n 150→\t}\n 151→\n 152→\trestoreFrom := startupTime.Add(-d)\n 153→\tcclog.Infof(\"[METRICSTORE]> Loading checkpoints newer than %s\\n\", restoreFrom.Format(time.RFC3339))\n 154→\tfiles, err := ms.FromCheckpointFiles(Keys.Checkpoints.RootDir, restoreFrom.Unix())\n 155→\tloadedData := ms.SizeInBytes() / 1024 / 1024 // In MB\n 156→\tif err != nil {\n 157→\t\tcclog.Fatalf(\"[METRICSTORE]> Loading checkpoints failed: %s\\n\", err.Error())\n 158→\t} else {\n 159→\t\tcclog.Infof(\"[METRICSTORE]> Checkpoints loaded (%d files, %d MB, that took %fs)\\n\", files, loadedData, time.Since(startupTime).Seconds())\n 160→\t}\n 161→\n 162→\t// Try to use less memory by forcing a GC run here and then\n 163→\t// lowering the target percentage. The default of 100 means\n 164→\t// that only once the ratio of new allocations execeds the\n 165→\t// previously active heap, a GC is triggered.\n 166→\t// Forcing a GC here will set the \"previously active heap\"\n 167→\t// to a minumum.\n 168→\t// runtime.GC()\n 169→\n 170→\tctx, shutdown := context.WithCancel(context.Background())\n 171→\n 172→\tRetention(wg, ctx)\n 173→\tCheckpointing(wg, ctx)\n 174→\tCleanUp(wg, ctx)\n 175→\tWALStaging(wg, ctx)\n 176→\tMemoryUsageTracker(wg, ctx)\n 177→\n 178→\t// Note: Signal handling has been removed from this function.\n 179→\t// The caller is responsible for handling shutdown signals and calling\n 180→\t// the shutdown() function when appropriate.\n 181→\t// Store the shutdown function for later use by Shutdown()\n 182→\tshutdownFuncMu.Lock()\n 183→\tshutdownFunc = shutdown\n 184→\tshutdownFuncMu.Unlock()\n 185→\n 186→\tif Keys.Subscriptions != nil {\n 187→\t\twg.Go(func() {\n 188→\t\t\tif err := ReceiveNats(ms, Keys.NumWorkers, ctx); err != nil {\n 189→\t\t\t\tcclog.Fatal(err)\n 190→\t\t\t}\n 191→\t\t})\n 192→\t}\n 193→}\n 194→\n 195→// InitMetrics initializes the singleton MemoryStore instance with the given metric configurations.\n 196→//\n 197→// This function must be called before GetMemoryStore() and can only be called once due to\n 198→// the singleton pattern. It assigns each metric an internal offset for efficient buffer indexing.\n 199→//\n 200→// Parameters:\n 201→// - metrics: Map of metric names to their configurations (frequency and aggregation strategy)\n 202→//\n 203→// Panics if any metric has Frequency == 0, which indicates an invalid configuration.\n 204→//\n 205→// After this call, the global msInstance is ready for use via GetMemoryStore().\n 206→func InitMetrics(metrics map[string]MetricConfig) {\n 207→\tsingleton.Do(func() {\n 208→\t\toffset := 0\n 209→\t\tfor key, cfg := range metrics {\n 210→\t\t\tif cfg.Frequency == 0 {\n 211→\t\t\t\tpanic(\"[METRICSTORE]> invalid frequency\")\n 212→\t\t\t}\n 213→\n 214→\t\t\tmetrics[key] = MetricConfig{\n 215→\t\t\t\tFrequency: cfg.Frequency,\n 216→\t\t\t\tAggregation: cfg.Aggregation,\n 217→\t\t\t\toffset: offset,\n 218→\t\t\t}\n 219→\t\t\toffset += 1\n 220→\t\t}\n 221→\n 222→\t\tmsInstance = &MemoryStore{\n 223→\t\t\troot: Level{\n 224→\t\t\t\tmetrics: make([]*buffer, len(metrics)),\n 225→\t\t\t\tchildren: make(map[string]*Level),\n 226→\t\t\t},\n 227→\t\t\tMetrics: metrics,\n 228→\t\t}\n 229→\t})\n 230→}\n 231→\n 232→// GetMemoryStore returns the singleton MemoryStore instance.\n 233→//\n 234→// Returns the initialized MemoryStore singleton. Calls cclog.Fatal if InitMetrics() was not called first.\n 235→//\n 236→// This function is safe for concurrent use after initialization.\n 237→func GetMemoryStore() *MemoryStore {\n 238→\tif msInstance == nil {\n 239→\t\tcclog.Warnf(\"[METRICSTORE]> MemoryStore not initialized!\")\n 240→\t}\n 241→\n 242→\treturn msInstance\n 243→}\n 244→\n 245→func (ms *MemoryStore) GetMetricFrequency(metricName string) (int64, error) {\n 246→\tif metric, ok := ms.Metrics[metricName]; ok {\n 247→\t\treturn metric.Frequency, nil\n 248→\t}\n 249→\treturn 0, fmt.Errorf(\"[METRICSTORE]> metric %s not found\", metricName)\n 250→}\n 251→\n 252→// SetNodeProvider sets the NodeProvider implementation for the MemoryStore.\n 253→// This must be called during initialization to provide job state information\n 254→// for selective buffer retention during Free operations.\n 255→// If not set, the Free function will fall back to freeing all buffers.\n 256→func (ms *MemoryStore) SetNodeProvider(provider NodeProvider) {\n 257→\tms.nodeProvider = provider\n 258→}\n 259→\n 260→// Shutdown performs a graceful shutdown of the metric store.\n 261→//\n 262→// This function cancels all background goroutines started by Init() and writes\n 263→// a final checkpoint to disk before returning. It should be called when the\n 264→// application receives a termination signal.\n 265→//\n 266→// The function will:\n 267→// 1. Cancel the context to stop all background workers\n 268→// 2. Close the WAL messages channel if using WAL format\n 269→// 3. Write a final checkpoint to preserve in-memory data\n 270→// 4. Log any errors encountered during shutdown\n 271→//\n 272→// Note: This function blocks until the final checkpoint is written.\n 273→func Shutdown() {\n 274→\ttotalStart := time.Now()\n 275→\n 276→\tshutdownFuncMu.Lock()\n 277→\tdefer shutdownFuncMu.Unlock()\n 278→\tif shutdownFunc != nil {\n 279→\t\tshutdownFunc()\n 280→\t}\n 281→\tcclog.Infof(\"[METRICSTORE]> Background workers cancelled (%v)\", time.Since(totalStart))\n 282→\n 283→\tif Keys.Checkpoints.FileFormat == \"wal\" {\n 284→\t\t// Signal producers to stop sending before closing channels,\n 285→\t\t// preventing send-on-closed-channel panics from in-flight NATS workers.\n 286→\t\twalShuttingDown.Store(true)\n 287→\t\t// Brief grace period for in-flight DecodeLine calls to complete.\n 288→\t\ttime.Sleep(100 * time.Millisecond)\n 289→\n 290→\t\tfor _, ch := range walShardChs {\n 291→\t\t\tclose(ch)\n 292→\t\t}\n 293→\t\tdrainStart := time.Now()\n 294→\t\tWaitForWALStagingDrain()\n 295→\t\tcclog.Infof(\"[METRICSTORE]> WAL staging goroutines exited (%v)\", time.Since(drainStart))\n 296→\t}\n 297→\n 298→\tcclog.Infof(\"[METRICSTORE]> Writing checkpoint to '%s'...\", Keys.Checkpoints.RootDir)\n 299→\tcheckpointStart := time.Now()\n 300→\tvar files int\n 301→\tvar err error\n 302→\n 303→\tms := GetMemoryStore()\n 304→\n 305→\tlastCheckpointMu.Lock()\n 306→\tfrom := lastCheckpoint\n 307→\tlastCheckpointMu.Unlock()\n 308→\n 309→\tif Keys.Checkpoints.FileFormat == \"wal\" {\n 310→\t\t// WAL files are deleted per-host inside ToCheckpointWAL workers.\n 311→\t\tfiles, _, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n 312→\t} else {\n 313→\t\tfiles, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n 314→\t}\n 315→\n 316→\tif err != nil {\n 317→\t\tcclog.Errorf(\"[METRICSTORE]> Writing checkpoint failed: %s\", err.Error())\n 318→\t}\n 319→\tcclog.Infof(\"[METRICSTORE]> Done! (%d files written in %v, total shutdown: %v)\", files, time.Since(checkpointStart), time.Since(totalStart))\n 320→}\n 321→\n 322→// Retention starts a background goroutine that periodically frees old metric data.\n 323→//\n 324→// This worker runs at half the retention interval and calls Free() to remove buffers\n 325→// older than the configured retention time. It respects the NodeProvider to preserve\n 326→// data for nodes with active jobs.\n 327→//\n 328→// Parameters:\n 329→// - wg: WaitGroup to signal completion when context is cancelled\n 330→// - ctx: Context for cancellation signal\n 331→//\n 332→// The goroutine exits when ctx is cancelled.\n 333→func Retention(wg *sync.WaitGroup, ctx context.Context) {\n 334→\tms := GetMemoryStore()\n 335→\n 336→\twg.Go(func() {\n 337→\t\td, err := time.ParseDuration(Keys.RetentionInMemory)\n 338→\t\tif err != nil {\n 339→\t\t\tcclog.Fatal(err)\n 340→\t\t}\n 341→\t\tif d <= 0 {\n 342→\t\t\treturn\n 343→\t\t}\n 344→\n 345→\t\ttickInterval := d / 2\n 346→\t\tif tickInterval <= 0 {\n 347→\t\t\treturn\n 348→\t\t}\n 349→\t\tticker := time.NewTicker(tickInterval)"}]},"uuid":"3f5e4ec9-e1f4-420a-aa57-2d9c486d081c","timestamp":"2026-03-27T05:49:11.941Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/metricstore.go","content":"\troot Level\n\tnodeProvider NodeProvider\n}\n\n// Init initializes the metric store from configuration and starts background workers.\n//\n// This function must be called exactly once before any other metricstore operations.\n// It performs the following initialization steps:\n// 1. Validates and decodes the metric store configuration\n// 2. Configures worker pool size (defaults to NumCPU/2+1, max 10)\n// 3. Loads metric configurations from all registered clusters\n// 4. Restores checkpoints within the retention window\n// 5. Starts background workers for retention, checkpointing, archiving, and monitoring\n// 6. Optionally subscribes to NATS for real-time metric ingestion\n//\n// Parameters:\n// - rawConfig: JSON configuration for the metric store (see MetricStoreConfig)\n// - wg: WaitGroup that will be incremented for each background goroutine started\n//\n// The function will call cclog.Fatal on critical errors during initialization.\n// Use Shutdown() to cleanly stop all background workers started by Init().\n//\n// Note: Signal handling must be implemented by the caller. Call Shutdown() when\n// receiving termination signals to ensure checkpoint data is persisted.\nfunc Init(rawConfig json.RawMessage, metrics map[string]MetricConfig, wg *sync.WaitGroup) {\n\tstartupTime := time.Now()\n\n\tif rawConfig != nil {\n\t\tconfig.Validate(configSchema, rawConfig)\n\t\tdec := json.NewDecoder(bytes.NewReader(rawConfig))\n\t\tdec.DisallowUnknownFields()\n\t\tif err := dec.Decode(&Keys); err != nil {\n\t\t\tcclog.Abortf(\"[METRICSTORE]> Metric Store Config Init: Could not decode config file '%s'.\\nError: %s\\n\", rawConfig, err.Error())\n\t\t}\n\t}\n\n\t// Set NumWorkers from config or use default\n\tif Keys.NumWorkers <= 0 {\n\t\tKeys.NumWorkers = min(runtime.NumCPU()/2+1, DefaultMaxWorkers)\n\t}\n\tcclog.Debugf(\"[METRICSTORE]> Using %d workers for checkpoint/archive operations\\n\", Keys.NumWorkers)\n\n\t// Pass the config.MetricStoreKeys\n\tInitMetrics(metrics)\n\n\tms := GetMemoryStore()\n\n\td, err := time.ParseDuration(Keys.RetentionInMemory)\n\tif err != nil {\n\t\tcclog.Fatal(err)\n\t}\n\n\trestoreFrom := startupTime.Add(-d)\n\tcclog.Infof(\"[METRICSTORE]> Loading checkpoints newer than %s\\n\", restoreFrom.Format(time.RFC3339))\n\tfiles, err := ms.FromCheckpointFiles(Keys.Checkpoints.RootDir, restoreFrom.Unix())\n\tloadedData := ms.SizeInBytes() / 1024 / 1024 // In MB\n\tif err != nil {\n\t\tcclog.Fatalf(\"[METRICSTORE]> Loading checkpoints failed: %s\\n\", err.Error())\n\t} else {\n\t\tcclog.Infof(\"[METRICSTORE]> Checkpoints loaded (%d files, %d MB, that took %fs)\\n\", files, loadedData, time.Since(startupTime).Seconds())\n\t}\n\n\t// Try to use less memory by forcing a GC run here and then\n\t// lowering the target percentage. The default of 100 means\n\t// that only once the ratio of new allocations execeds the\n\t// previously active heap, a GC is triggered.\n\t// Forcing a GC here will set the \"previously active heap\"\n\t// to a minumum.\n\t// runtime.GC()\n\n\tctx, shutdown := context.WithCancel(context.Background())\n\n\tRetention(wg, ctx)\n\tCheckpointing(wg, ctx)\n\tCleanUp(wg, ctx)\n\tWALStaging(wg, ctx)\n\tMemoryUsageTracker(wg, ctx)\n\n\t// Note: Signal handling has been removed from this function.\n\t// The caller is responsible for handling shutdown signals and calling\n\t// the shutdown() function when appropriate.\n\t// Store the shutdown function for later use by Shutdown()\n\tshutdownFuncMu.Lock()\n\tshutdownFunc = shutdown\n\tshutdownFuncMu.Unlock()\n\n\tif Keys.Subscriptions != nil {\n\t\twg.Go(func() {\n\t\t\tif err := ReceiveNats(ms, Keys.NumWorkers, ctx); err != nil {\n\t\t\t\tcclog.Fatal(err)\n\t\t\t}\n\t\t})\n\t}\n}\n\n// InitMetrics initializes the singleton MemoryStore instance with the given metric configurations.\n//\n// This function must be called before GetMemoryStore() and can only be called once due to\n// the singleton pattern. It assigns each metric an internal offset for efficient buffer indexing.\n//\n// Parameters:\n// - metrics: Map of metric names to their configurations (frequency and aggregation strategy)\n//\n// Panics if any metric has Frequency == 0, which indicates an invalid configuration.\n//\n// After this call, the global msInstance is ready for use via GetMemoryStore().\nfunc InitMetrics(metrics map[string]MetricConfig) {\n\tsingleton.Do(func() {\n\t\toffset := 0\n\t\tfor key, cfg := range metrics {\n\t\t\tif cfg.Frequency == 0 {\n\t\t\t\tpanic(\"[METRICSTORE]> invalid frequency\")\n\t\t\t}\n\n\t\t\tmetrics[key] = MetricConfig{\n\t\t\t\tFrequency: cfg.Frequency,\n\t\t\t\tAggregation: cfg.Aggregation,\n\t\t\t\toffset: offset,\n\t\t\t}\n\t\t\toffset += 1\n\t\t}\n\n\t\tmsInstance = &MemoryStore{\n\t\t\troot: Level{\n\t\t\t\tmetrics: make([]*buffer, len(metrics)),\n\t\t\t\tchildren: make(map[string]*Level),\n\t\t\t},\n\t\t\tMetrics: metrics,\n\t\t}\n\t})\n}\n\n// GetMemoryStore returns the singleton MemoryStore instance.\n//\n// Returns the initialized MemoryStore singleton. Calls cclog.Fatal if InitMetrics() was not called first.\n//\n// This function is safe for concurrent use after initialization.\nfunc GetMemoryStore() *MemoryStore {\n\tif msInstance == nil {\n\t\tcclog.Warnf(\"[METRICSTORE]> MemoryStore not initialized!\")\n\t}\n\n\treturn msInstance\n}\n\nfunc (ms *MemoryStore) GetMetricFrequency(metricName string) (int64, error) {\n\tif metric, ok := ms.Metrics[metricName]; ok {\n\t\treturn metric.Frequency, nil\n\t}\n\treturn 0, fmt.Errorf(\"[METRICSTORE]> metric %s not found\", metricName)\n}\n\n// SetNodeProvider sets the NodeProvider implementation for the MemoryStore.\n// This must be called during initialization to provide job state information\n// for selective buffer retention during Free operations.\n// If not set, the Free function will fall back to freeing all buffers.\nfunc (ms *MemoryStore) SetNodeProvider(provider NodeProvider) {\n\tms.nodeProvider = provider\n}\n\n// Shutdown performs a graceful shutdown of the metric store.\n//\n// This function cancels all background goroutines started by Init() and writes\n// a final checkpoint to disk before returning. It should be called when the\n// application receives a termination signal.\n//\n// The function will:\n// 1. Cancel the context to stop all background workers\n// 2. Close the WAL messages channel if using WAL format\n// 3. Write a final checkpoint to preserve in-memory data\n// 4. Log any errors encountered during shutdown\n//\n// Note: This function blocks until the final checkpoint is written.\nfunc Shutdown() {\n\ttotalStart := time.Now()\n\n\tshutdownFuncMu.Lock()\n\tdefer shutdownFuncMu.Unlock()\n\tif shutdownFunc != nil {\n\t\tshutdownFunc()\n\t}\n\tcclog.Infof(\"[METRICSTORE]> Background workers cancelled (%v)\", time.Since(totalStart))\n\n\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\t// Signal producers to stop sending before closing channels,\n\t\t// preventing send-on-closed-channel panics from in-flight NATS workers.\n\t\twalShuttingDown.Store(true)\n\t\t// Brief grace period for in-flight DecodeLine calls to complete.\n\t\ttime.Sleep(100 * time.Millisecond)\n\n\t\tfor _, ch := range walShardChs {\n\t\t\tclose(ch)\n\t\t}\n\t\tdrainStart := time.Now()\n\t\tWaitForWALStagingDrain()\n\t\tcclog.Infof(\"[METRICSTORE]> WAL staging goroutines exited (%v)\", time.Since(drainStart))\n\t}\n\n\tcclog.Infof(\"[METRICSTORE]> Writing checkpoint to '%s'...\", Keys.Checkpoints.RootDir)\n\tcheckpointStart := time.Now()\n\tvar files int\n\tvar err error\n\n\tms := GetMemoryStore()\n\n\tlastCheckpointMu.Lock()\n\tfrom := lastCheckpoint\n\tlastCheckpointMu.Unlock()\n\n\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\t// WAL files are deleted per-host inside ToCheckpointWAL workers.\n\t\tfiles, _, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n\t} else {\n\t\tfiles, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n\t}\n\n\tif err != nil {\n\t\tcclog.Errorf(\"[METRICSTORE]> Writing checkpoint failed: %s\", err.Error())\n\t}\n\tcclog.Infof(\"[METRICSTORE]> Done! (%d files written in %v, total shutdown: %v)\", files, time.Since(checkpointStart), time.Since(totalStart))\n}\n\n// Retention starts a background goroutine that periodically frees old metric data.\n//\n// This worker runs at half the retention interval and calls Free() to remove buffers\n// older than the configured retention time. It respects the NodeProvider to preserve\n// data for nodes with active jobs.\n//\n// Parameters:\n// - wg: WaitGroup to signal completion when context is cancelled\n// - ctx: Context for cancellation signal\n//\n// The goroutine exits when ctx is cancelled.\nfunc Retention(wg *sync.WaitGroup, ctx context.Context) {\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\t\td, err := time.ParseDuration(Keys.RetentionInMemory)\n\t\tif err != nil {\n\t\t\tcclog.Fatal(err)\n\t\t}\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\ttickInterval := d / 2\n\t\tif tickInterval <= 0 {\n\t\t\treturn\n\t\t}\n\t\tticker := time.NewTicker(tickInterval)","numLines":250,"startLine":100,"totalLines":814}},"sourceToolAssistantUUID":"b0f2450d-2643-417a-9c6f-f6ccf7382948","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"3f5e4ec9-e1f4-420a-aa57-2d9c486d081c","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_013vJuE44UCYFZWXcxH8qeY4","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01VVEqcm35vuDzUHjUz3kHiP","name":"Read","input":{"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/archive.go","offset":95,"limit":80},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":4837,"cache_read_input_tokens":19465,"output_tokens":286,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":4837,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4S3V1saLRtZ3oMoZJC","type":"assistant","uuid":"8d7b6cd9-8d1f-484d-a758-65f35b7c4ac6","timestamp":"2026-03-27T05:49:12.258Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"8d7b6cd9-8d1f-484d-a758-65f35b7c4ac6","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01VVEqcm35vuDzUHjUz3kHiP","toolUseID":"toolu_01VVEqcm35vuDzUHjUz3kHiP","timestamp":"2026-03-27T05:49:12.268Z","uuid":"b372af9c-cb9d-48cd-b8de-bfedf3d236c9","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"8d7b6cd9-8d1f-484d-a758-65f35b7c4ac6","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01VVEqcm35vuDzUHjUz3kHiP","type":"tool_result","content":" 95→// deleteCheckpoints removes checkpoint files older than `from` across all clusters/hosts.\n 96→func deleteCheckpoints(checkpointsDir string, from int64) (int, error) {\n 97→\tentries1, err := os.ReadDir(checkpointsDir)\n 98→\tif err != nil {\n 99→\t\treturn 0, err\n 100→\t}\n 101→\n 102→\ttype workItem struct {\n 103→\t\tdir string\n 104→\t\tcluster, host string\n 105→\t}\n 106→\n 107→\tvar wg sync.WaitGroup\n 108→\tn, errs := int32(0), int32(0)\n 109→\twork := make(chan workItem, Keys.NumWorkers)\n 110→\n 111→\twg.Add(Keys.NumWorkers)\n 112→\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n 113→\t\tgo func() {\n 114→\t\t\tdefer wg.Done()\n 115→\t\t\tfor item := range work {\n 116→\t\t\t\tentries, err := os.ReadDir(item.dir)\n 117→\t\t\t\tif err != nil {\n 118→\t\t\t\t\tcclog.Errorf(\"error reading %s/%s: %s\", item.cluster, item.host, err.Error())\n 119→\t\t\t\t\tatomic.AddInt32(&errs, 1)\n 120→\t\t\t\t\tcontinue\n 121→\t\t\t\t}\n 122→\n 123→\t\t\t\tfiles, err := findFiles(entries, from, false)\n 124→\t\t\t\tif err != nil {\n 125→\t\t\t\t\tcclog.Errorf(\"error finding files in %s/%s: %s\", item.cluster, item.host, err.Error())\n 126→\t\t\t\t\tatomic.AddInt32(&errs, 1)\n 127→\t\t\t\t\tcontinue\n 128→\t\t\t\t}\n 129→\n 130→\t\t\t\tfor _, checkpoint := range files {\n 131→\t\t\t\t\tif err := os.Remove(filepath.Join(item.dir, checkpoint)); err != nil {\n 132→\t\t\t\t\t\tcclog.Errorf(\"error deleting %s/%s/%s: %s\", item.cluster, item.host, checkpoint, err.Error())\n 133→\t\t\t\t\t\tatomic.AddInt32(&errs, 1)\n 134→\t\t\t\t\t} else {\n 135→\t\t\t\t\t\tatomic.AddInt32(&n, 1)\n 136→\t\t\t\t\t}\n 137→\t\t\t\t}\n 138→\t\t\t}\n 139→\t\t}()\n 140→\t}\n 141→\n 142→\tfor _, de1 := range entries1 {\n 143→\t\tentries2, e := os.ReadDir(filepath.Join(checkpointsDir, de1.Name()))\n 144→\t\tif e != nil {\n 145→\t\t\terr = e\n 146→\t\t\tcontinue\n 147→\t\t}\n 148→\n 149→\t\tfor _, de2 := range entries2 {\n 150→\t\t\twork <- workItem{\n 151→\t\t\t\tdir: filepath.Join(checkpointsDir, de1.Name(), de2.Name()),\n 152→\t\t\t\tcluster: de1.Name(),\n 153→\t\t\t\thost: de2.Name(),\n 154→\t\t\t}\n 155→\t\t}\n 156→\t}\n 157→\n 158→\tclose(work)\n 159→\twg.Wait()\n 160→\n 161→\tif err != nil {\n 162→\t\treturn int(n), err\n 163→\t}\n 164→\tif errs > 0 {\n 165→\t\treturn int(n), fmt.Errorf(\"%d errors happened while deleting (%d successes)\", errs, n)\n 166→\t}\n 167→\treturn int(n), nil\n 168→}\n 169→\n 170→// archiveCheckpoints archives checkpoint files to Parquet format.\n 171→// Produces one Parquet file per cluster: //.parquet\n 172→// Workers load checkpoint files from disk and send CheckpointFile trees on a\n 173→// back-pressured channel. The main thread streams each tree directly to Parquet\n 174→// rows without materializing all rows in memory."}]},"uuid":"6845eacf-c4c7-4be6-a169-185e3faba073","timestamp":"2026-03-27T05:49:12.268Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/archive.go","content":"// deleteCheckpoints removes checkpoint files older than `from` across all clusters/hosts.\nfunc deleteCheckpoints(checkpointsDir string, from int64) (int, error) {\n\tentries1, err := os.ReadDir(checkpointsDir)\n\tif err != nil {\n\t\treturn 0, err\n\t}\n\n\ttype workItem struct {\n\t\tdir string\n\t\tcluster, host string\n\t}\n\n\tvar wg sync.WaitGroup\n\tn, errs := int32(0), int32(0)\n\twork := make(chan workItem, Keys.NumWorkers)\n\n\twg.Add(Keys.NumWorkers)\n\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n\t\tgo func() {\n\t\t\tdefer wg.Done()\n\t\t\tfor item := range work {\n\t\t\t\tentries, err := os.ReadDir(item.dir)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"error reading %s/%s: %s\", item.cluster, item.host, err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t\tcontinue\n\t\t\t\t}\n\n\t\t\t\tfiles, err := findFiles(entries, from, false)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"error finding files in %s/%s: %s\", item.cluster, item.host, err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t\tcontinue\n\t\t\t\t}\n\n\t\t\t\tfor _, checkpoint := range files {\n\t\t\t\t\tif err := os.Remove(filepath.Join(item.dir, checkpoint)); err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"error deleting %s/%s/%s: %s\", item.cluster, item.host, checkpoint, err.Error())\n\t\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tatomic.AddInt32(&n, 1)\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}()\n\t}\n\n\tfor _, de1 := range entries1 {\n\t\tentries2, e := os.ReadDir(filepath.Join(checkpointsDir, de1.Name()))\n\t\tif e != nil {\n\t\t\terr = e\n\t\t\tcontinue\n\t\t}\n\n\t\tfor _, de2 := range entries2 {\n\t\t\twork <- workItem{\n\t\t\t\tdir: filepath.Join(checkpointsDir, de1.Name(), de2.Name()),\n\t\t\t\tcluster: de1.Name(),\n\t\t\t\thost: de2.Name(),\n\t\t\t}\n\t\t}\n\t}\n\n\tclose(work)\n\twg.Wait()\n\n\tif err != nil {\n\t\treturn int(n), err\n\t}\n\tif errs > 0 {\n\t\treturn int(n), fmt.Errorf(\"%d errors happened while deleting (%d successes)\", errs, n)\n\t}\n\treturn int(n), nil\n}\n\n// archiveCheckpoints archives checkpoint files to Parquet format.\n// Produces one Parquet file per cluster: //.parquet\n// Workers load checkpoint files from disk and send CheckpointFile trees on a\n// back-pressured channel. The main thread streams each tree directly to Parquet\n// rows without materializing all rows in memory.","numLines":80,"startLine":95,"totalLines":343}},"sourceToolAssistantUUID":"8d7b6cd9-8d1f-484d-a758-65f35b7c4ac6","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"6845eacf-c4c7-4be6-a169-185e3faba073","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01D7mVWsA8eJPmtmMFQhebnw","type":"message","role":"assistant","content":[{"type":"thinking","thinking":"","signature":"EqgCClkIDBgCKkBD07FRM9bUGqdsDdz6axycpKE+bAif+t5CXW6qNXSLkmFc2w0pDqcY8QztX5k6+ebyndF0N8IMG+q6Py+dZNSiMg9jbGF1ZGUtb3B1cy00LTY4ABIMZ6FmYMf7M4Vc6815GgzqA4Qn9ORTWW8QbZMiMKMKAQKgs00RPdOzQ6OHqWnnzVGO1LzWaIKLQOd3e+CUOQ6K5bfS9+QtmbVghEaO9ip9eXF6MQUBzELays4vvjnBrs1F1Uy6atqe4g86AO/nzRrX1ZyrCvMS2liz+uE0jAfYDIITtunX1ZwQ5VKCwztzyD63m3FTWv8wNuGpdYG7ws0k76zHLKQ4hV1QnLb0BAJKzcOQ51uszoGew7rCB2XkduTIrF1zGpwZVMJ1TFYYAQ=="}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":5982,"cache_read_input_tokens":24302,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":5982},"output_tokens":43,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4SUfbT93TUjJ9nwfwF","type":"assistant","uuid":"188eb90b-15e7-4cd8-9edd-cd039e539045","timestamp":"2026-03-27T05:49:15.985Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"188eb90b-15e7-4cd8-9edd-cd039e539045","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01D7mVWsA8eJPmtmMFQhebnw","type":"message","role":"assistant","content":[{"type":"text","text":"Now let me find the `loadFile` and `toCheckpointFile` functions, and `findFiles`."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":5982,"cache_read_input_tokens":24302,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":5982},"output_tokens":43,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4SUfbT93TUjJ9nwfwF","type":"assistant","uuid":"df2de6d4-d263-43ad-bfe7-7fa02f6e5a1b","timestamp":"2026-03-27T05:49:16.986Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} 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+{"parentUuid":"8b979c44-d17d-4d89-b1f6-e19f1e444a1c","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Grep","command":"callback"},"parentToolUseID":"toolu_01Tgq1JQMxFGXPWP32jcYUZL","toolUseID":"toolu_01Tgq1JQMxFGXPWP32jcYUZL","timestamp":"2026-03-27T05:49:17.700Z","uuid":"be7bc5fe-86e4-46e4-ad84-c8688a2fc7f4","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"8b979c44-d17d-4d89-b1f6-e19f1e444a1c","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01Tgq1JQMxFGXPWP32jcYUZL","type":"tool_result","content":"pkg/metricstore/checkpoint.go:263:func (l *Level) toCheckpointFile(from, to int64, m *MemoryStore) (*CheckpointFile, error) {\npkg/metricstore/checkpoint.go:464:func (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {\npkg/metricstore/checkpoint.go:619:func findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {"}]},"uuid":"a3230a1e-d92d-4ab5-b2fa-492b0d19871f","timestamp":"2026-03-27T05:49:17.700Z","toolUseResult":{"mode":"content","numFiles":0,"filenames":[],"content":"pkg/metricstore/checkpoint.go:263:func (l *Level) toCheckpointFile(from, to int64, m *MemoryStore) (*CheckpointFile, error) {\npkg/metricstore/checkpoint.go:464:func (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {\npkg/metricstore/checkpoint.go:619:func findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {","numLines":3},"sourceToolAssistantUUID":"8b979c44-d17d-4d89-b1f6-e19f1e444a1c","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} 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+{"parentUuid":"cd50eda0-19f3-4d85-b91e-10a5564c57de","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01DjV37t8pcn6MUQUSnBHbUe","toolUseID":"toolu_01DjV37t8pcn6MUQUSnBHbUe","timestamp":"2026-03-27T05:49:23.258Z","uuid":"25c6b138-8586-4b84-aa43-9edddb7a9492","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"cd50eda0-19f3-4d85-b91e-10a5564c57de","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01DjV37t8pcn6MUQUSnBHbUe","type":"tool_result","content":" 263→func (l *Level) toCheckpointFile(from, to int64, m *MemoryStore) (*CheckpointFile, error) {\n 264→\tl.lock.RLock()\n 265→\tdefer l.lock.RUnlock()\n 266→\n 267→\tretval := &CheckpointFile{\n 268→\t\tFrom: from,\n 269→\t\tTo: to,\n 270→\t\tMetrics: make(map[string]*CheckpointMetrics),\n 271→\t\tChildren: make(map[string]*CheckpointFile),\n 272→\t}\n 273→\n 274→\tfor metric, minfo := range m.Metrics {\n 275→\t\tb := l.metrics[minfo.offset]\n 276→\t\tif b == nil {\n 277→\t\t\tcontinue\n 278→\t\t}\n 279→\n 280→\t\tallArchived := true\n 281→\t\tb.iterFromTo(from, to, func(b *buffer) error {\n 282→\t\t\tif !b.archived {\n 283→\t\t\t\tallArchived = false\n 284→\t\t\t\treturn fmt.Errorf(\"stop\") // Early termination signal\n 285→\t\t\t}\n 286→\t\t\treturn nil\n 287→\t\t})\n 288→\n 289→\t\tif allArchived {\n 290→\t\t\tcontinue\n 291→\t\t}\n 292→\n 293→\t\tdata := make([]schema.Float, (to-from)/b.frequency+1)\n 294→\t\tdata, start, end, err := b.read(from, to, data)\n 295→\t\tif err != nil {\n 296→\t\t\treturn nil, err\n 297→\t\t}\n 298→\n 299→\t\tfor i := int((end - start) / b.frequency); i < len(data); i++ {\n 300→\t\t\tdata[i] = schema.NaN\n 301→\t\t}\n 302→\n 303→\t\tretval.Metrics[metric] = &CheckpointMetrics{\n 304→\t\t\tFrequency: b.frequency,\n 305→\t\t\tStart: start,\n 306→\t\t\tData: data,\n 307→\t\t}\n 308→\t}\n 309→\n 310→\tfor name, child := range l.children {\n 311→\t\tval, err := child.toCheckpointFile(from, to, m)\n 312→\t\tif err != nil {\n 313→\t\t\treturn nil, err\n 314→\t\t}\n 315→\n 316→\t\tif val != nil {\n 317→\t\t\tretval.Children[name] = val\n 318→\t\t}\n 319→\t}\n 320→\n 321→\tif len(retval.Children) == 0 && len(retval.Metrics) == 0 {\n 322→\t\treturn nil, nil\n 323→\t}\n 324→\n 325→\treturn retval, nil\n 326→}\n 327→\n 328→// toCheckpoint writes a Level's data to a JSON checkpoint file.\n 329→// Creates directory if needed. Returns ErrNoNewArchiveData if nothing to save.\n 330→func (l *Level) toCheckpoint(dir string, from, to int64, m *MemoryStore) error {\n 331→\tcf, err := l.toCheckpointFile(from, to, m)\n 332→\tif err != nil {\n 333→\t\treturn err\n 334→\t}\n 335→\n 336→\tif cf == nil {\n 337→\t\treturn ErrNoNewArchiveData\n 338→\t}\n 339→\n 340→\tfilepath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n 341→\tf, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n 342→\tif err != nil && os.IsNotExist(err) {"}]},"uuid":"7da4d200-044a-4aa3-b11a-5f363a59482b","timestamp":"2026-03-27T05:49:23.257Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","content":"func (l *Level) toCheckpointFile(from, to int64, m *MemoryStore) (*CheckpointFile, error) {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tretval := &CheckpointFile{\n\t\tFrom: from,\n\t\tTo: to,\n\t\tMetrics: make(map[string]*CheckpointMetrics),\n\t\tChildren: make(map[string]*CheckpointFile),\n\t}\n\n\tfor metric, minfo := range m.Metrics {\n\t\tb := l.metrics[minfo.offset]\n\t\tif b == nil {\n\t\t\tcontinue\n\t\t}\n\n\t\tallArchived := true\n\t\tb.iterFromTo(from, to, func(b *buffer) error {\n\t\t\tif !b.archived {\n\t\t\t\tallArchived = false\n\t\t\t\treturn fmt.Errorf(\"stop\") // Early termination signal\n\t\t\t}\n\t\t\treturn nil\n\t\t})\n\n\t\tif allArchived {\n\t\t\tcontinue\n\t\t}\n\n\t\tdata := make([]schema.Float, (to-from)/b.frequency+1)\n\t\tdata, start, end, err := b.read(from, to, data)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\n\t\tfor i := int((end - start) / b.frequency); i < len(data); i++ {\n\t\t\tdata[i] = schema.NaN\n\t\t}\n\n\t\tretval.Metrics[metric] = &CheckpointMetrics{\n\t\t\tFrequency: b.frequency,\n\t\t\tStart: start,\n\t\t\tData: data,\n\t\t}\n\t}\n\n\tfor name, child := range l.children {\n\t\tval, err := child.toCheckpointFile(from, to, m)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\n\t\tif val != nil {\n\t\t\tretval.Children[name] = val\n\t\t}\n\t}\n\n\tif len(retval.Children) == 0 && len(retval.Metrics) == 0 {\n\t\treturn nil, nil\n\t}\n\n\treturn retval, nil\n}\n\n// toCheckpoint writes a Level's data to a JSON checkpoint file.\n// Creates directory if needed. Returns ErrNoNewArchiveData if nothing to save.\nfunc (l *Level) toCheckpoint(dir string, from, to int64, m *MemoryStore) error {\n\tcf, err := l.toCheckpointFile(from, to, m)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tif cf == nil {\n\t\treturn ErrNoNewArchiveData\n\t}\n\n\tfilepath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n\tf, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\tif err != nil && os.IsNotExist(err) {","numLines":80,"startLine":263,"totalLines":670}},"sourceToolAssistantUUID":"cd50eda0-19f3-4d85-b91e-10a5564c57de","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"7da4d200-044a-4aa3-b11a-5f363a59482b","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01W2kJokfJ53q2h6sPJWwPWM","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01RFyo47XydwexT95vN1jLCw","name":"Read","input":{"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","offset":464,"limit":80},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":328,"cache_read_input_tokens":30284,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":328},"output_tokens":59,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4SsPaQm15rqoCB96mX","type":"assistant","uuid":"7e585982-af86-4787-889e-e3df519c64ab","timestamp":"2026-03-27T05:49:24.221Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"7e585982-af86-4787-889e-e3df519c64ab","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01RFyo47XydwexT95vN1jLCw","toolUseID":"toolu_01RFyo47XydwexT95vN1jLCw","timestamp":"2026-03-27T05:49:24.252Z","uuid":"2a9cedb2-c01a-4549-b4a5-e2db72a656f7","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"7e585982-af86-4787-889e-e3df519c64ab","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01RFyo47XydwexT95vN1jLCw","type":"tool_result","content":" 464→func (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {\n 465→\tfor name, metric := range cf.Metrics {\n 466→\t\tn := len(metric.Data)\n 467→\t\tb := &buffer{\n 468→\t\t\tfrequency: metric.Frequency,\n 469→\t\t\tstart: metric.Start,\n 470→\t\t\tdata: metric.Data[0:n:n],\n 471→\t\t\tprev: nil,\n 472→\t\t\tnext: nil,\n 473→\t\t\tarchived: true,\n 474→\t\t}\n 475→\n 476→\t\tminfo, ok := m.Metrics[name]\n 477→\t\tif !ok {\n 478→\t\t\tcontinue\n 479→\t\t}\n 480→\n 481→\t\tprev := l.metrics[minfo.offset]\n 482→\t\tif prev == nil {\n 483→\t\t\tl.metrics[minfo.offset] = b\n 484→\t\t} else {\n 485→\t\t\tif prev.start > b.start {\n 486→\t\t\t\treturn fmt.Errorf(\"[METRICSTORE]> buffer start time %d is before previous buffer start %d\", b.start, prev.start)\n 487→\t\t\t}\n 488→\n 489→\t\t\tb.prev = prev\n 490→\t\t\tprev.next = b\n 491→\t\t}\n 492→\t\tl.metrics[minfo.offset] = b\n 493→\t}\n 494→\n 495→\tif len(cf.Children) > 0 && l.children == nil {\n 496→\t\tl.children = make(map[string]*Level)\n 497→\t}\n 498→\n 499→\tfor sel, childCf := range cf.Children {\n 500→\t\tchild, ok := l.children[sel]\n 501→\t\tif !ok {\n 502→\t\t\tchild = &Level{\n 503→\t\t\t\tmetrics: make([]*buffer, len(m.Metrics)),\n 504→\t\t\t\tchildren: nil,\n 505→\t\t\t}\n 506→\t\t\tl.children[sel] = child\n 507→\t\t}\n 508→\n 509→\t\tif err := child.loadFile(childCf, m); err != nil {\n 510→\t\t\treturn err\n 511→\t\t}\n 512→\t}\n 513→\n 514→\treturn nil\n 515→}\n 516→\n 517→// fromCheckpoint loads all checkpoint files (JSON, binary snapshot, WAL) for a\n 518→// single host directory. Snapshot files are loaded first (sorted by timestamp),\n 519→// then current.wal is replayed on top.\n 520→func (l *Level) fromCheckpoint(m *MemoryStore, dir string, from int64) (int, error) {\n 521→\tdirentries, err := os.ReadDir(dir)\n 522→\tif err != nil {\n 523→\t\tif os.IsNotExist(err) {\n 524→\t\t\treturn 0, nil\n 525→\t\t}\n 526→\t\treturn 0, err\n 527→\t}\n 528→\n 529→\tallFiles := make([]fs.DirEntry, 0)\n 530→\tvar walEntry fs.DirEntry\n 531→\tfilesLoaded := 0\n 532→\n 533→\tfor _, e := range direntries {\n 534→\t\tif e.IsDir() {\n 535→\t\t\t// Legacy: skip subdirectories (only used by old Avro format).\n 536→\t\t\t// These are ignored; their data is not loaded.\n 537→\t\t\tcclog.Debugf(\"[METRICSTORE]> skipping subdirectory %s in checkpoint dir %s\", e.Name(), dir)\n 538→\t\t\tcontinue\n 539→\t\t}\n 540→\n 541→\t\tname := e.Name()\n 542→\t\tif strings.HasSuffix(name, \".json\") || strings.HasSuffix(name, \".bin\") {\n 543→\t\t\tallFiles = append(allFiles, e)"}]},"uuid":"d749026d-ac9b-43b3-8ee6-734fefd246b3","timestamp":"2026-03-27T05:49:24.251Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","content":"func (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {\n\tfor name, metric := range cf.Metrics {\n\t\tn := len(metric.Data)\n\t\tb := &buffer{\n\t\t\tfrequency: metric.Frequency,\n\t\t\tstart: metric.Start,\n\t\t\tdata: metric.Data[0:n:n],\n\t\t\tprev: nil,\n\t\t\tnext: nil,\n\t\t\tarchived: true,\n\t\t}\n\n\t\tminfo, ok := m.Metrics[name]\n\t\tif !ok {\n\t\t\tcontinue\n\t\t}\n\n\t\tprev := l.metrics[minfo.offset]\n\t\tif prev == nil {\n\t\t\tl.metrics[minfo.offset] = b\n\t\t} else {\n\t\t\tif prev.start > b.start {\n\t\t\t\treturn fmt.Errorf(\"[METRICSTORE]> buffer start time %d is before previous buffer start %d\", b.start, prev.start)\n\t\t\t}\n\n\t\t\tb.prev = prev\n\t\t\tprev.next = b\n\t\t}\n\t\tl.metrics[minfo.offset] = b\n\t}\n\n\tif len(cf.Children) > 0 && l.children == nil {\n\t\tl.children = make(map[string]*Level)\n\t}\n\n\tfor sel, childCf := range cf.Children {\n\t\tchild, ok := l.children[sel]\n\t\tif !ok {\n\t\t\tchild = &Level{\n\t\t\t\tmetrics: make([]*buffer, len(m.Metrics)),\n\t\t\t\tchildren: nil,\n\t\t\t}\n\t\t\tl.children[sel] = child\n\t\t}\n\n\t\tif err := child.loadFile(childCf, m); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\n\treturn nil\n}\n\n// fromCheckpoint loads all checkpoint files (JSON, binary snapshot, WAL) for a\n// single host directory. Snapshot files are loaded first (sorted by timestamp),\n// then current.wal is replayed on top.\nfunc (l *Level) fromCheckpoint(m *MemoryStore, dir string, from int64) (int, error) {\n\tdirentries, err := os.ReadDir(dir)\n\tif err != nil {\n\t\tif os.IsNotExist(err) {\n\t\t\treturn 0, nil\n\t\t}\n\t\treturn 0, err\n\t}\n\n\tallFiles := make([]fs.DirEntry, 0)\n\tvar walEntry fs.DirEntry\n\tfilesLoaded := 0\n\n\tfor _, e := range direntries {\n\t\tif e.IsDir() {\n\t\t\t// Legacy: skip subdirectories (only used by old Avro format).\n\t\t\t// These are ignored; their data is not loaded.\n\t\t\tcclog.Debugf(\"[METRICSTORE]> skipping subdirectory %s in checkpoint dir %s\", e.Name(), dir)\n\t\t\tcontinue\n\t\t}\n\n\t\tname := e.Name()\n\t\tif strings.HasSuffix(name, \".json\") || strings.HasSuffix(name, \".bin\") {\n\t\t\tallFiles = append(allFiles, e)","numLines":80,"startLine":464,"totalLines":670}},"sourceToolAssistantUUID":"7e585982-af86-4787-889e-e3df519c64ab","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} 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+{"parentUuid":"ab7092aa-bddb-40e0-bcfb-b21e3fe2d735","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_012eSS4zquMTWgT6z41YfQKZ","toolUseID":"toolu_012eSS4zquMTWgT6z41YfQKZ","timestamp":"2026-03-27T05:49:24.654Z","uuid":"5d17a02d-46bc-46d0-b6f6-e3850f5cdaaf","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"ab7092aa-bddb-40e0-bcfb-b21e3fe2d735","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_012eSS4zquMTWgT6z41YfQKZ","type":"tool_result","content":" 619→func findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {\n 620→\tnums := map[string]int64{}\n 621→\tfor _, e := range direntries {\n 622→\t\tname := e.Name()\n 623→\t\tif !strings.HasSuffix(name, \".json\") && !strings.HasSuffix(name, \".bin\") {\n 624→\t\t\tcontinue\n 625→\t\t}\n 626→\n 627→\t\tts, err := parseTimestampFromFilename(name)\n 628→\t\tif err != nil {\n 629→\t\t\treturn nil, err\n 630→\t\t}\n 631→\t\tnums[name] = ts\n 632→\t}\n 633→\n 634→\tsort.Slice(direntries, func(i, j int) bool {\n 635→\t\ta, b := direntries[i], direntries[j]\n 636→\t\treturn nums[a.Name()] < nums[b.Name()]\n 637→\t})\n 638→\n 639→\tif len(nums) == 0 {\n 640→\t\treturn nil, nil\n 641→\t}\n 642→\n 643→\tfilenames := make([]string, 0)\n 644→\n 645→\tfor i, e := range direntries {\n 646→\t\tts1 := nums[e.Name()]\n 647→\n 648→\t\tif findMoreRecentFiles && t <= ts1 {\n 649→\t\t\tfilenames = append(filenames, e.Name())\n 650→\t\t} else if !findMoreRecentFiles && ts1 <= t && ts1 != 0 {\n 651→\t\t\tfilenames = append(filenames, e.Name())\n 652→\t\t}\n 653→\n 654→\t\tif i == len(direntries)-1 {\n 655→\t\t\tcontinue\n 656→\t\t}\n 657→\n 658→\t\tenext := direntries[i+1]\n 659→\t\tts2 := nums[enext.Name()]\n 660→\n 661→\t\tif findMoreRecentFiles {\n 662→\t\t\tif ts1 < t && t < ts2 {\n 663→\t\t\t\tfilenames = append(filenames, e.Name())\n 664→\t\t\t}\n 665→\t\t}\n 666→\t}\n 667→\n 668→\treturn filenames, nil\n 669→}\n 670→"}]},"uuid":"d7f704a9-4777-4e3a-88ba-3c267070beab","timestamp":"2026-03-27T05:49:24.653Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","content":"func findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {\n\tnums := map[string]int64{}\n\tfor _, e := range direntries {\n\t\tname := e.Name()\n\t\tif !strings.HasSuffix(name, \".json\") && !strings.HasSuffix(name, \".bin\") {\n\t\t\tcontinue\n\t\t}\n\n\t\tts, err := parseTimestampFromFilename(name)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\t\tnums[name] = ts\n\t}\n\n\tsort.Slice(direntries, func(i, j int) bool {\n\t\ta, b := direntries[i], direntries[j]\n\t\treturn nums[a.Name()] < nums[b.Name()]\n\t})\n\n\tif len(nums) == 0 {\n\t\treturn nil, nil\n\t}\n\n\tfilenames := make([]string, 0)\n\n\tfor i, e := range direntries {\n\t\tts1 := nums[e.Name()]\n\n\t\tif findMoreRecentFiles && t <= ts1 {\n\t\t\tfilenames = append(filenames, e.Name())\n\t\t} else if !findMoreRecentFiles && ts1 <= t && ts1 != 0 {\n\t\t\tfilenames = append(filenames, e.Name())\n\t\t}\n\n\t\tif i == len(direntries)-1 {\n\t\t\tcontinue\n\t\t}\n\n\t\tenext := direntries[i+1]\n\t\tts2 := nums[enext.Name()]\n\n\t\tif findMoreRecentFiles {\n\t\t\tif ts1 < t && t < ts2 {\n\t\t\t\tfilenames = append(filenames, e.Name())\n\t\t\t}\n\t\t}\n\t}\n\n\treturn filenames, nil\n}\n","numLines":52,"startLine":619,"totalLines":670}},"sourceToolAssistantUUID":"ab7092aa-bddb-40e0-bcfb-b21e3fe2d735","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"d7f704a9-4777-4e3a-88ba-3c267070beab","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01YV6XiqZu6a41xSiHSwFjqq","type":"message","role":"assistant","content":[{"type":"text","text":"Now let me also check how `toCheckpointFile` is used in the binary/WAL path to understand if `archived` is handled differently there."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":2998,"cache_read_input_tokens":30612,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":2998},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4TP7zi6YE6uvE8rL6g","type":"assistant","uuid":"e7248c92-2505-4b97-81ff-ca2e5c77addd","timestamp":"2026-03-27T05:49:29.379Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} 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{\npkg/metricstore/checkpoint.go:283:\t\t\t\tallArchived = false\npkg/metricstore/checkpoint.go:289:\t\tif allArchived {\npkg/metricstore/buffer.go:187:\tb.archived = false"}]},"uuid":"f0ea95dd-85a6-4da6-a005-0cd3d43253ec","timestamp":"2026-03-27T05:49:30.357Z","toolUseResult":{"mode":"content","numFiles":0,"filenames":[],"content":"pkg/metricstore/debug.go:26:\tif b.archived {\npkg/metricstore/checkpoint.go:280:\t\tallArchived := true\npkg/metricstore/checkpoint.go:282:\t\t\tif !b.archived {\npkg/metricstore/checkpoint.go:283:\t\t\t\tallArchived = false\npkg/metricstore/checkpoint.go:289:\t\tif allArchived {\npkg/metricstore/buffer.go:187:\tb.archived = false","numLines":6},"sourceToolAssistantUUID":"7937d035-23e5-4266-94d7-9ccb90fa2028","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} 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+{"parentUuid":"dc3177ce-6a2e-45ae-b372-36b2a150633c","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01Y2K4wWD8S6m1RofnkoHF4D","toolUseID":"toolu_01Y2K4wWD8S6m1RofnkoHF4D","timestamp":"2026-03-27T05:49:34.628Z","uuid":"70ee0304-2647-4b64-b3bc-b61566e5ee40","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"dc3177ce-6a2e-45ae-b372-36b2a150633c","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01Y2K4wWD8S6m1RofnkoHF4D","type":"tool_result","content":" 627→func (m *MemoryStore) ToCheckpointWAL(dir string, from, to int64) (int, []string, error) {\n 628→\t// Collect all cluster/host pairs.\n 629→\tm.root.lock.RLock()\n 630→\ttotalHosts := 0\n 631→\tfor _, l1 := range m.root.children {\n 632→\t\tl1.lock.RLock()\n 633→\t\ttotalHosts += len(l1.children)\n 634→\t\tl1.lock.RUnlock()\n 635→\t}\n 636→\tm.root.lock.RUnlock()\n 637→\n 638→\tlevels := make([]*Level, 0, totalHosts)\n 639→\tselectors := make([][]string, 0, totalHosts)\n 640→\n 641→\tm.root.lock.RLock()\n 642→\tfor sel1, l1 := range m.root.children {\n 643→\t\tl1.lock.RLock()\n 644→\t\tfor sel2, l2 := range l1.children {\n 645→\t\t\tlevels = append(levels, l2)\n 646→\t\t\tselectors = append(selectors, []string{sel1, sel2})\n 647→\t\t}\n 648→\t\tl1.lock.RUnlock()\n 649→\t}\n 650→\tm.root.lock.RUnlock()\n 651→\n 652→\ttype workItem struct {\n 653→\t\tlevel *Level\n 654→\t\thostDir string\n 655→\t\tselector []string\n 656→\t}\n 657→\n 658→\ttotalWork := len(levels)\n 659→\tcclog.Infof(\"[METRICSTORE]> Starting binary checkpoint for %d hosts with %d workers\", totalWork, Keys.NumWorkers)\n 660→\n 661→\tn, errs, completed := int32(0), int32(0), int32(0)\n 662→\tvar successDirs []string\n 663→\tvar successMu sync.Mutex\n 664→\n 665→\tvar wg sync.WaitGroup\n 666→\twg.Add(Keys.NumWorkers)\n 667→\twork := make(chan workItem, Keys.NumWorkers*2)\n 668→\n 669→\t// Progress logging goroutine.\n 670→\tstopProgress := make(chan struct{})\n 671→\tgo func() {\n 672→\t\tticker := time.NewTicker(10 * time.Second)\n 673→\t\tdefer ticker.Stop()\n 674→\t\tfor {\n 675→\t\t\tselect {\n 676→\t\t\tcase <-ticker.C:\n 677→\t\t\t\tcclog.Infof(\"[METRICSTORE]> Checkpoint progress: %d/%d hosts (%d written, %d errors)\",\n 678→\t\t\t\t\tatomic.LoadInt32(&completed), totalWork, atomic.LoadInt32(&n), atomic.LoadInt32(&errs))\n 679→\t\t\tcase <-stopProgress:\n 680→\t\t\t\treturn\n 681→\t\t\t}\n 682→\t\t}\n 683→\t}()\n 684→\n 685→\tfor range Keys.NumWorkers {\n 686→\t\tgo func() {\n 687→\t\t\tdefer wg.Done()\n 688→\t\t\tfor wi := range work {\n 689→\t\t\t\terr := wi.level.toCheckpointBinary(wi.hostDir, from, to, m)\n 690→\t\t\t\tif err != nil {\n 691→\t\t\t\t\tif err == ErrNoNewArchiveData {\n 692→\t\t\t\t\t\tatomic.AddInt32(&completed, 1)\n 693→\t\t\t\t\t\tcontinue\n 694→\t\t\t\t\t}\n 695→\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> binary checkpoint error for %s: %v\", wi.hostDir, err)\n 696→\t\t\t\t\tatomic.AddInt32(&errs, 1)\n 697→\t\t\t\t} else {\n 698→\t\t\t\t\tatomic.AddInt32(&n, 1)\n 699→\t\t\t\t\t// Delete WAL immediately after successful snapshot.\n 700→\t\t\t\t\twalPath := path.Join(wi.hostDir, \"current.wal\")\n 701→\t\t\t\t\tif err := os.Remove(walPath); err != nil && !os.IsNotExist(err) {\n 702→\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL remove %s: %v\", walPath, err)\n 703→\t\t\t\t\t}\n 704→\t\t\t\t\tsuccessMu.Lock()\n 705→\t\t\t\t\tsuccessDirs = append(successDirs, wi.hostDir)\n 706→\t\t\t\t\tsuccessMu.Unlock()\n 707→\t\t\t\t}\n 708→\t\t\t\tatomic.AddInt32(&completed, 1)\n 709→\t\t\t}\n 710→\t\t}()\n 711→\t}\n 712→\n 713→\tfor i := range levels {\n 714→\t\thostDir := path.Join(dir, path.Join(selectors[i]...))\n 715→\t\twork <- workItem{\n 716→\t\t\tlevel: levels[i],\n 717→\t\t\thostDir: hostDir,\n 718→\t\t\tselector: selectors[i],\n 719→\t\t}\n 720→\t}\n 721→\tclose(work)\n 722→\twg.Wait()\n 723→\tclose(stopProgress)\n 724→\n 725→\tif errs > 0 {\n 726→\t\treturn int(n), successDirs, fmt.Errorf(\"[METRICSTORE]> %d errors during binary checkpoint (%d successes)\", errs, n)"}]},"uuid":"3c193526-193a-460f-a6ca-de945d6258ec","timestamp":"2026-03-27T05:49:34.627Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/walCheckpoint.go","content":"func (m *MemoryStore) ToCheckpointWAL(dir string, from, to int64) (int, []string, error) {\n\t// Collect all cluster/host pairs.\n\tm.root.lock.RLock()\n\ttotalHosts := 0\n\tfor _, l1 := range m.root.children {\n\t\tl1.lock.RLock()\n\t\ttotalHosts += len(l1.children)\n\t\tl1.lock.RUnlock()\n\t}\n\tm.root.lock.RUnlock()\n\n\tlevels := make([]*Level, 0, totalHosts)\n\tselectors := make([][]string, 0, totalHosts)\n\n\tm.root.lock.RLock()\n\tfor sel1, l1 := range m.root.children {\n\t\tl1.lock.RLock()\n\t\tfor sel2, l2 := range l1.children {\n\t\t\tlevels = append(levels, l2)\n\t\t\tselectors = append(selectors, []string{sel1, sel2})\n\t\t}\n\t\tl1.lock.RUnlock()\n\t}\n\tm.root.lock.RUnlock()\n\n\ttype workItem struct {\n\t\tlevel *Level\n\t\thostDir string\n\t\tselector []string\n\t}\n\n\ttotalWork := len(levels)\n\tcclog.Infof(\"[METRICSTORE]> Starting binary checkpoint for %d hosts with %d workers\", totalWork, Keys.NumWorkers)\n\n\tn, errs, completed := int32(0), int32(0), int32(0)\n\tvar successDirs []string\n\tvar successMu sync.Mutex\n\n\tvar wg sync.WaitGroup\n\twg.Add(Keys.NumWorkers)\n\twork := make(chan workItem, Keys.NumWorkers*2)\n\n\t// Progress logging goroutine.\n\tstopProgress := make(chan struct{})\n\tgo func() {\n\t\tticker := time.NewTicker(10 * time.Second)\n\t\tdefer ticker.Stop()\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ticker.C:\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> Checkpoint progress: %d/%d hosts (%d written, %d errors)\",\n\t\t\t\t\tatomic.LoadInt32(&completed), totalWork, atomic.LoadInt32(&n), atomic.LoadInt32(&errs))\n\t\t\tcase <-stopProgress:\n\t\t\t\treturn\n\t\t\t}\n\t\t}\n\t}()\n\n\tfor range Keys.NumWorkers {\n\t\tgo func() {\n\t\t\tdefer wg.Done()\n\t\t\tfor wi := range work {\n\t\t\t\terr := wi.level.toCheckpointBinary(wi.hostDir, from, to, m)\n\t\t\t\tif err != nil {\n\t\t\t\t\tif err == ErrNoNewArchiveData {\n\t\t\t\t\t\tatomic.AddInt32(&completed, 1)\n\t\t\t\t\t\tcontinue\n\t\t\t\t\t}\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> binary checkpoint error for %s: %v\", wi.hostDir, err)\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t} else {\n\t\t\t\t\tatomic.AddInt32(&n, 1)\n\t\t\t\t\t// Delete WAL immediately after successful snapshot.\n\t\t\t\t\twalPath := path.Join(wi.hostDir, \"current.wal\")\n\t\t\t\t\tif err := os.Remove(walPath); err != nil && !os.IsNotExist(err) {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL remove %s: %v\", walPath, err)\n\t\t\t\t\t}\n\t\t\t\t\tsuccessMu.Lock()\n\t\t\t\t\tsuccessDirs = append(successDirs, wi.hostDir)\n\t\t\t\t\tsuccessMu.Unlock()\n\t\t\t\t}\n\t\t\t\tatomic.AddInt32(&completed, 1)\n\t\t\t}\n\t\t}()\n\t}\n\n\tfor i := range levels {\n\t\thostDir := path.Join(dir, path.Join(selectors[i]...))\n\t\twork <- workItem{\n\t\t\tlevel: levels[i],\n\t\t\thostDir: hostDir,\n\t\t\tselector: selectors[i],\n\t\t}\n\t}\n\tclose(work)\n\twg.Wait()\n\tclose(stopProgress)\n\n\tif errs > 0 {\n\t\treturn int(n), successDirs, fmt.Errorf(\"[METRICSTORE]> %d errors during binary checkpoint (%d successes)\", errs, n)","numLines":100,"startLine":627,"totalLines":951}},"sourceToolAssistantUUID":"dc3177ce-6a2e-45ae-b372-36b2a150633c","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"3c193526-193a-460f-a6ca-de945d6258ec","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01TMkmQ8SXCmjCzBzjLRwFQD","type":"message","role":"assistant","content":[{"type":"text","text":"Now let me check `toCheckpointBinary` to see if it also checks the `archived` flag."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1466,"cache_read_input_tokens":34088,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1466},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4U7ia88RCx7TccUHbS","type":"assistant","uuid":"09c9dc1d-04fa-4d4d-a94c-8f11e9bb6a8a","timestamp":"2026-03-27T05:49:37.708Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} 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{"}]},"uuid":"bc7ad6a1-9b12-4ecd-b1fe-9136fece44de","timestamp":"2026-03-27T05:49:38.334Z","toolUseResult":{"mode":"content","numFiles":0,"filenames":[],"content":"pkg/metricstore/walCheckpoint.go:733:func (l *Level) toCheckpointBinary(dir string, from, to int64, m *MemoryStore) error {","numLines":1},"sourceToolAssistantUUID":"80478003-c625-4a59-8a04-f1fe0666b485","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"bc7ad6a1-9b12-4ecd-b1fe-9136fece44de","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01P71GFoaqZvAEEuei82hd8K","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_0189Yjbdn3QSLDtA54JqKtVP","name":"Read","input":{"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/walCheckpoint.go","offset":733,"limit":80},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":192,"cache_read_input_tokens":35554,"output_tokens":108,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":192,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4UPY5YVdCPjamzirSE","type":"assistant","uuid":"976f254e-0ee6-4c65-937d-b145d0b2cb12","timestamp":"2026-03-27T05:49:42.006Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"976f254e-0ee6-4c65-937d-b145d0b2cb12","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_0189Yjbdn3QSLDtA54JqKtVP","toolUseID":"toolu_0189Yjbdn3QSLDtA54JqKtVP","timestamp":"2026-03-27T05:49:42.028Z","uuid":"70ced594-b3db-4df9-92a7-6f6298750635","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"976f254e-0ee6-4c65-937d-b145d0b2cb12","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_0189Yjbdn3QSLDtA54JqKtVP","type":"tool_result","content":" 733→func (l *Level) toCheckpointBinary(dir string, from, to int64, m *MemoryStore) error {\n 734→\tcf, err := l.toCheckpointFile(from, to, m)\n 735→\tif err != nil {\n 736→\t\treturn err\n 737→\t}\n 738→\tif cf == nil {\n 739→\t\treturn ErrNoNewArchiveData\n 740→\t}\n 741→\n 742→\tif err := os.MkdirAll(dir, CheckpointDirPerms); err != nil {\n 743→\t\treturn fmt.Errorf(\"mkdir %s: %w\", dir, err)\n 744→\t}\n 745→\n 746→\t// Write to a temp file first, then rename (atomic on POSIX).\n 747→\ttmpPath := path.Join(dir, fmt.Sprintf(\"%d.bin.tmp\", from))\n 748→\tfinalPath := path.Join(dir, fmt.Sprintf(\"%d.bin\", from))\n 749→\n 750→\tf, err := os.OpenFile(tmpPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n 751→\tif err != nil {\n 752→\t\treturn fmt.Errorf(\"open binary snapshot %s: %w\", tmpPath, err)\n 753→\t}\n 754→\n 755→\tbw := bufio.NewWriter(f)\n 756→\tif err := writeBinarySnapshotFile(bw, cf); err != nil {\n 757→\t\tf.Close()\n 758→\t\tos.Remove(tmpPath)\n 759→\t\treturn fmt.Errorf(\"write binary snapshot: %w\", err)\n 760→\t}\n 761→\tif err := bw.Flush(); err != nil {\n 762→\t\tf.Close()\n 763→\t\tos.Remove(tmpPath)\n 764→\t\treturn err\n 765→\t}\n 766→\tf.Close()\n 767→\n 768→\treturn os.Rename(tmpPath, finalPath)\n 769→}\n 770→\n 771→// writeBinarySnapshotFile writes the binary snapshot file header and level tree.\n 772→func writeBinarySnapshotFile(w io.Writer, cf *CheckpointFile) error {\n 773→\tif err := binary.Write(w, binary.LittleEndian, snapFileMagic); err != nil {\n 774→\t\treturn err\n 775→\t}\n 776→\tif err := binary.Write(w, binary.LittleEndian, cf.From); err != nil {\n 777→\t\treturn err\n 778→\t}\n 779→\tif err := binary.Write(w, binary.LittleEndian, cf.To); err != nil {\n 780→\t\treturn err\n 781→\t}\n 782→\treturn writeBinaryLevel(w, cf)\n 783→}\n 784→\n 785→// writeBinaryLevel recursively writes a CheckpointFile level in binary format.\n 786→func writeBinaryLevel(w io.Writer, cf *CheckpointFile) error {\n 787→\tif err := binary.Write(w, binary.LittleEndian, uint32(len(cf.Metrics))); err != nil {\n 788→\t\treturn err\n 789→\t}\n 790→\n 791→\tfor name, metric := range cf.Metrics {\n 792→\t\tif err := writeString16(w, name); err != nil {\n 793→\t\t\treturn err\n 794→\t\t}\n 795→\t\tif err := binary.Write(w, binary.LittleEndian, metric.Frequency); err != nil {\n 796→\t\t\treturn err\n 797→\t\t}\n 798→\t\tif err := binary.Write(w, binary.LittleEndian, metric.Start); err != nil {\n 799→\t\t\treturn err\n 800→\t\t}\n 801→\t\tif err := binary.Write(w, binary.LittleEndian, uint32(len(metric.Data))); err != nil {\n 802→\t\t\treturn err\n 803→\t\t}\n 804→\t\tfor _, v := range metric.Data {\n 805→\t\t\tif err := binary.Write(w, binary.LittleEndian, math.Float32bits(float32(v))); err != nil {\n 806→\t\t\t\treturn err\n 807→\t\t\t}\n 808→\t\t}\n 809→\t}\n 810→\n 811→\tif err := binary.Write(w, binary.LittleEndian, uint32(len(cf.Children))); err != nil {\n 812→\t\treturn err"}]},"uuid":"cd3b693f-8a07-4486-96f0-0ef831677acc","timestamp":"2026-03-27T05:49:42.027Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/walCheckpoint.go","content":"func (l *Level) toCheckpointBinary(dir string, from, to int64, m *MemoryStore) error {\n\tcf, err := l.toCheckpointFile(from, to, m)\n\tif err != nil {\n\t\treturn err\n\t}\n\tif cf == nil {\n\t\treturn ErrNoNewArchiveData\n\t}\n\n\tif err := os.MkdirAll(dir, CheckpointDirPerms); err != nil {\n\t\treturn fmt.Errorf(\"mkdir %s: %w\", dir, err)\n\t}\n\n\t// Write to a temp file first, then rename (atomic on POSIX).\n\ttmpPath := path.Join(dir, fmt.Sprintf(\"%d.bin.tmp\", from))\n\tfinalPath := path.Join(dir, fmt.Sprintf(\"%d.bin\", from))\n\n\tf, err := os.OpenFile(tmpPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"open binary snapshot %s: %w\", tmpPath, err)\n\t}\n\n\tbw := bufio.NewWriter(f)\n\tif err := writeBinarySnapshotFile(bw, cf); err != nil {\n\t\tf.Close()\n\t\tos.Remove(tmpPath)\n\t\treturn fmt.Errorf(\"write binary snapshot: %w\", err)\n\t}\n\tif err := bw.Flush(); err != nil {\n\t\tf.Close()\n\t\tos.Remove(tmpPath)\n\t\treturn err\n\t}\n\tf.Close()\n\n\treturn os.Rename(tmpPath, finalPath)\n}\n\n// writeBinarySnapshotFile writes the binary snapshot file header and level tree.\nfunc writeBinarySnapshotFile(w io.Writer, cf *CheckpointFile) error {\n\tif err := binary.Write(w, binary.LittleEndian, snapFileMagic); err != nil {\n\t\treturn err\n\t}\n\tif err := binary.Write(w, binary.LittleEndian, cf.From); err != nil {\n\t\treturn err\n\t}\n\tif err := binary.Write(w, binary.LittleEndian, cf.To); err != nil {\n\t\treturn err\n\t}\n\treturn writeBinaryLevel(w, cf)\n}\n\n// writeBinaryLevel recursively writes a CheckpointFile level in binary format.\nfunc writeBinaryLevel(w io.Writer, cf *CheckpointFile) error {\n\tif err := binary.Write(w, binary.LittleEndian, uint32(len(cf.Metrics))); err != nil {\n\t\treturn err\n\t}\n\n\tfor name, metric := range cf.Metrics {\n\t\tif err := writeString16(w, name); err != nil {\n\t\t\treturn err\n\t\t}\n\t\tif err := binary.Write(w, binary.LittleEndian, metric.Frequency); err != nil {\n\t\t\treturn err\n\t\t}\n\t\tif err := binary.Write(w, binary.LittleEndian, metric.Start); err != nil {\n\t\t\treturn err\n\t\t}\n\t\tif err := binary.Write(w, binary.LittleEndian, uint32(len(metric.Data))); err != nil {\n\t\t\treturn err\n\t\t}\n\t\tfor _, v := range metric.Data {\n\t\t\tif err := binary.Write(w, binary.LittleEndian, math.Float32bits(float32(v))); err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t}\n\t}\n\n\tif err := binary.Write(w, binary.LittleEndian, uint32(len(cf.Children))); err != nil {\n\t\treturn err","numLines":80,"startLine":733,"totalLines":951}},"sourceToolAssistantUUID":"976f254e-0ee6-4c65-937d-b145d0b2cb12","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"cd3b693f-8a07-4486-96f0-0ef831677acc","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01ULT1tAqHF28xJjgf9xYjF7","type":"message","role":"assistant","content":[{"type":"text","text":"Good, `toCheckpointBinary` also calls `toCheckpointFile`, which has the `allArchived` skip logic. Both JSON and binary paths are affected.\n\nNow let me also check the JSON checkpoint's `toCheckpoint` for Bug 3 (non-atomic writes)."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1259,"cache_read_input_tokens":35746,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1259},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4UfR4PYcunBp93jGBJ","type":"assistant","uuid":"bfc7fb35-90ea-4568-aa0a-a3b7cce4ce2e","timestamp":"2026-03-27T05:49:46.372Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"bfc7fb35-90ea-4568-aa0a-a3b7cce4ce2e","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01ULT1tAqHF28xJjgf9xYjF7","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01MquucNi2T7kuieWGt1h2vB","name":"Read","input":{"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","offset":328,"limit":40},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1259,"cache_read_input_tokens":35746,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1259},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4UfR4PYcunBp93jGBJ","type":"assistant","uuid":"a2b09547-e50b-43e3-8565-970bf29a82c9","timestamp":"2026-03-27T05:49:47.084Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"a2b09547-e50b-43e3-8565-970bf29a82c9","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01MquucNi2T7kuieWGt1h2vB","toolUseID":"toolu_01MquucNi2T7kuieWGt1h2vB","timestamp":"2026-03-27T05:49:47.111Z","uuid":"a2fac49a-b630-4a5a-8b3b-29a8cdb8915d","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"a2b09547-e50b-43e3-8565-970bf29a82c9","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01MquucNi2T7kuieWGt1h2vB","type":"tool_result","content":" 328→// toCheckpoint writes a Level's data to a JSON checkpoint file.\n 329→// Creates directory if needed. Returns ErrNoNewArchiveData if nothing to save.\n 330→func (l *Level) toCheckpoint(dir string, from, to int64, m *MemoryStore) error {\n 331→\tcf, err := l.toCheckpointFile(from, to, m)\n 332→\tif err != nil {\n 333→\t\treturn err\n 334→\t}\n 335→\n 336→\tif cf == nil {\n 337→\t\treturn ErrNoNewArchiveData\n 338→\t}\n 339→\n 340→\tfilepath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n 341→\tf, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n 342→\tif err != nil && os.IsNotExist(err) {\n 343→\t\terr = os.MkdirAll(dir, CheckpointDirPerms)\n 344→\t\tif err == nil {\n 345→\t\t\tf, err = os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n 346→\t\t}\n 347→\t}\n 348→\tif err != nil {\n 349→\t\treturn err\n 350→\t}\n 351→\tdefer f.Close()\n 352→\n 353→\tbw := bufio.NewWriter(f)\n 354→\tif err = json.NewEncoder(bw).Encode(cf); err != nil {\n 355→\t\treturn err\n 356→\t}\n 357→\n 358→\treturn bw.Flush()\n 359→}\n 360→\n 361→// enqueueCheckpointHosts traverses checkpoint directory and enqueues cluster/host pairs.\n 362→// Returns error if directory structure is invalid.\n 363→func enqueueCheckpointHosts(dir string, work chan<- [2]string) error {\n 364→\tclustersDir, err := os.ReadDir(dir)\n 365→\tif err != nil {\n 366→\t\treturn err\n 367→\t}"}]},"uuid":"90036966-f07d-43a9-a41f-af414218918d","timestamp":"2026-03-27T05:49:47.110Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","content":"// toCheckpoint writes a Level's data to a JSON checkpoint file.\n// Creates directory if needed. Returns ErrNoNewArchiveData if nothing to save.\nfunc (l *Level) toCheckpoint(dir string, from, to int64, m *MemoryStore) error {\n\tcf, err := l.toCheckpointFile(from, to, m)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tif cf == nil {\n\t\treturn ErrNoNewArchiveData\n\t}\n\n\tfilepath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n\tf, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\tif err != nil && os.IsNotExist(err) {\n\t\terr = os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err == nil {\n\t\t\tf, err = os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\t\t}\n\t}\n\tif err != nil {\n\t\treturn err\n\t}\n\tdefer f.Close()\n\n\tbw := bufio.NewWriter(f)\n\tif err = json.NewEncoder(bw).Encode(cf); err != nil {\n\t\treturn err\n\t}\n\n\treturn bw.Flush()\n}\n\n// enqueueCheckpointHosts traverses checkpoint directory and enqueues cluster/host pairs.\n// Returns error if directory structure is invalid.\nfunc enqueueCheckpointHosts(dir string, work chan<- [2]string) error {\n\tclustersDir, err := os.ReadDir(dir)\n\tif err != nil {\n\t\treturn err\n\t}","numLines":40,"startLine":328,"totalLines":670}},"sourceToolAssistantUUID":"a2b09547-e50b-43e3-8565-970bf29a82c9","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"90036966-f07d-43a9-a41f-af414218918d","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01QU7MdCspAFXf1FzAvBcR6p","type":"message","role":"assistant","content":[{"type":"text","text":"Now I have a clear picture. Let me also check the `buffer` struct definition to confirm the `archived` field."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":743,"cache_read_input_tokens":37005,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":743},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4V3tAMNo65uYmZmH2F","type":"assistant","uuid":"6bcf7ecc-1fae-48b0-9a80-1d3f24cad71a","timestamp":"2026-03-27T05:49:51.477Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"6bcf7ecc-1fae-48b0-9a80-1d3f24cad71a","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01QU7MdCspAFXf1FzAvBcR6p","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01C3HKuMN1wPzwqSRQV7Ha29","name":"Grep","input":{"pattern":"type buffer struct","path":"/Users/jan/tmp/cc-backend/pkg/metricstore","output_mode":"content","-A":10},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":743,"cache_read_input_tokens":37005,"output_tokens":149,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":743,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4V3tAMNo65uYmZmH2F","type":"assistant","uuid":"9828f741-6475-4a45-967e-a62655a368cf","timestamp":"2026-03-27T05:49:52.253Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"9828f741-6475-4a45-967e-a62655a368cf","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Grep","command":"callback"},"parentToolUseID":"toolu_01C3HKuMN1wPzwqSRQV7Ha29","toolUseID":"toolu_01C3HKuMN1wPzwqSRQV7Ha29","timestamp":"2026-03-27T05:49:52.290Z","uuid":"5af63500-d1aa-4786-8119-0d9bd8c91594","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"9828f741-6475-4a45-967e-a62655a368cf","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01C3HKuMN1wPzwqSRQV7Ha29","type":"tool_result","content":"pkg/metricstore/buffer.go:170:type buffer struct {\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-171-\tprev *buffer\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-172-\tnext *buffer\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-173-\tdata []schema.Float\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-174-\tfrequency int64\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-175-\tstart int64\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-176-\tarchived bool\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-177-\tclosed bool\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-178-\tlastUsed int64\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-179-}\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-180-"}]},"uuid":"40036d5a-49c2-4dee-89a9-7926e4affc67","timestamp":"2026-03-27T05:49:52.290Z","toolUseResult":{"mode":"content","numFiles":0,"filenames":[],"content":"pkg/metricstore/buffer.go:170:type buffer struct {\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-171-\tprev *buffer\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-172-\tnext *buffer\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-173-\tdata []schema.Float\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-174-\tfrequency int64\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-175-\tstart int64\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-176-\tarchived bool\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-177-\tclosed bool\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-178-\tlastUsed int64\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-179-}\n/Users/jan/tmp/cc-backend/pkg/metricstore/buffer.go-180-","numLines":11},"sourceToolAssistantUUID":"9828f741-6475-4a45-967e-a62655a368cf","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"40036d5a-49c2-4dee-89a9-7926e4affc67","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01W5HT2ZBdfTYmSeAxCL8da3","type":"message","role":"assistant","content":[{"type":"text","text":"Good. Now I have all the context needed. Let me implement the fixes.\n\n## Fix 1 (Primary): Pass `restoreFrom` to `Checkpointing()` and set `archived: false` on loaded buffers"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1312,"cache_read_input_tokens":37005,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1312},"output_tokens":2,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4VRDZN8C8DKFF8Ud25","type":"assistant","uuid":"fc0d611a-b7a2-4377-a4cf-32d01abf0d51","timestamp":"2026-03-27T05:49:57.467Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"type":"file-history-snapshot","messageId":"c23950e1-2fa7-447e-9f8e-2e07bc21e791","snapshot":{"messageId":"bb5f87e3-8441-4923-a8f8-bd65d5319e3d","trackedFileBackups":{"pkg/metricstore/checkpoint.go":{"backupFileName":"5982c404552064a8@v1","version":1,"backupTime":"2026-03-27T05:49:59.434Z"}},"timestamp":"2026-03-27T05:49:00.537Z"},"isSnapshotUpdate":true} +{"parentUuid":"fc0d611a-b7a2-4377-a4cf-32d01abf0d51","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01W5HT2ZBdfTYmSeAxCL8da3","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01S2kqCPLYJgzZgp2LSdDJND","name":"Edit","input":{"replace_all":false,"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","old_string":"func Checkpointing(wg *sync.WaitGroup, ctx context.Context) {\n\tlastCheckpointMu.Lock()\n\tlastCheckpoint = time.Now()\n\tlastCheckpointMu.Unlock()","new_string":"func Checkpointing(wg *sync.WaitGroup, ctx context.Context, restoreFrom time.Time) {\n\tlastCheckpointMu.Lock()\n\tlastCheckpoint = restoreFrom\n\tlastCheckpointMu.Unlock()"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1312,"cache_read_input_tokens":37005,"output_tokens":273,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":1312,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4VRDZN8C8DKFF8Ud25","type":"assistant","uuid":"c23950e1-2fa7-447e-9f8e-2e07bc21e791","timestamp":"2026-03-27T05:49:59.412Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"c23950e1-2fa7-447e-9f8e-2e07bc21e791","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Edit","command":"callback"},"parentToolUseID":"toolu_01S2kqCPLYJgzZgp2LSdDJND","toolUseID":"toolu_01S2kqCPLYJgzZgp2LSdDJND","timestamp":"2026-03-27T05:49:59.440Z","uuid":"3c40b209-5a48-4207-aec8-9f0029199306","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"c23950e1-2fa7-447e-9f8e-2e07bc21e791","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01S2kqCPLYJgzZgp2LSdDJND","type":"tool_result","content":"The file /Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go has been updated successfully."}]},"uuid":"42207b2f-b752-4a27-8755-c21c64a7e600","timestamp":"2026-03-27T05:49:59.440Z","toolUseResult":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","oldString":"func Checkpointing(wg *sync.WaitGroup, ctx context.Context) {\n\tlastCheckpointMu.Lock()\n\tlastCheckpoint = time.Now()\n\tlastCheckpointMu.Unlock()","newString":"func Checkpointing(wg *sync.WaitGroup, ctx context.Context, restoreFrom time.Time) {\n\tlastCheckpointMu.Lock()\n\tlastCheckpoint = restoreFrom\n\tlastCheckpointMu.Unlock()","originalFile":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// This file implements checkpoint persistence for the in-memory metric store.\n//\n// Checkpoints enable graceful restarts by periodically saving in-memory metric\n// data to disk in JSON or binary format. The checkpoint system:\n//\n// Key Features:\n// - Periodic background checkpointing via the Checkpointing() worker\n// - Two format families: JSON (human-readable) and WAL+binary (compact, crash-safe)\n// - Parallel checkpoint creation and loading using worker pools\n// - Hierarchical file organization: checkpoint_dir/cluster/host/timestamp.{json|bin}\n// - WAL file: checkpoint_dir/cluster/host/current.wal (append-only, per-entry)\n// - Only saves unarchived data (archived data is already persisted elsewhere)\n// - GC optimization during loading to prevent excessive heap growth\n//\n// Checkpoint Workflow:\n// 1. Init() loads checkpoints within retention window at startup\n// 2. Checkpointing() worker periodically saves new data\n// 3. Shutdown() writes final checkpoint before exit\n//\n// File Organization:\n//\n//\tcheckpoints/\n//\t cluster1/\n//\t host001/\n//\t 1234567890.json (JSON format: full subtree snapshot)\n//\t 1234567890.bin (binary format: full subtree snapshot)\n//\t current.wal (WAL format: append-only per-entry log)\n//\t host002/\n//\t ...\npackage metricstore\n\nimport (\n\t\"bufio\"\n\t\"context\"\n\t\"encoding/json\"\n\t\"errors\"\n\t\"fmt\"\n\t\"io/fs\"\n\t\"os\"\n\t\"path\"\n\t\"path/filepath\"\n\t\"sort\"\n\t\"strconv\"\n\t\"strings\"\n\t\"sync\"\n\t\"sync/atomic\"\n\t\"time\"\n\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n)\n\nconst (\n\tCheckpointFilePerms = 0o644 // File permissions for checkpoint files\n\tCheckpointDirPerms = 0o755 // Directory permissions for checkpoint directories\n\tGCTriggerInterval = DefaultGCTriggerInterval // Interval for triggering GC during checkpoint loading\n)\n\n// CheckpointMetrics represents metric data in a checkpoint file.\n// Whenever the structure changes, update MarshalJSON as well!\ntype CheckpointMetrics struct {\n\tData []schema.Float `json:\"data\"`\n\tFrequency int64 `json:\"frequency\"`\n\tStart int64 `json:\"start\"`\n}\n\n// CheckpointFile represents the hierarchical structure of a checkpoint file.\n// It mirrors the Level tree structure from the MemoryStore.\ntype CheckpointFile struct {\n\tMetrics map[string]*CheckpointMetrics `json:\"metrics\"`\n\tChildren map[string]*CheckpointFile `json:\"children\"`\n\tFrom int64 `json:\"from\"`\n\tTo int64 `json:\"to\"`\n}\n\n// lastCheckpoint tracks the timestamp of the last checkpoint creation.\nvar (\n\tlastCheckpoint time.Time\n\tlastCheckpointMu sync.Mutex\n)\n\n// Checkpointing starts a background worker that periodically saves metric data to disk.\n//\n// Checkpoints are written every 12 hours (hardcoded).\n//\n// Format behaviour:\n// - \"json\": Periodic checkpointing every checkpointInterval\n// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\nfunc Checkpointing(wg *sync.WaitGroup, ctx context.Context) {\n\tlastCheckpointMu.Lock()\n\tlastCheckpoint = time.Now()\n\tlastCheckpointMu.Unlock()\n\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\n\t\td := 12 * time.Hour // default checkpoint interval\n\t\tif Keys.CheckpointInterval != \"\" {\n\t\t\tparsed, err := time.ParseDuration(Keys.CheckpointInterval)\n\t\t\tif err != nil {\n\t\t\t\tcclog.Errorf(\"[METRICSTORE]> invalid checkpoint-interval %q: %s, using default 12h\", Keys.CheckpointInterval, err)\n\t\t\t} else {\n\t\t\t\td = parsed\n\t\t\t}\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\tfrom := lastCheckpoint\n\t\t\t\tlastCheckpointMu.Unlock()\n\n\t\t\t\tnow := time.Now()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start checkpointing (starting at %s)...\", from.Format(time.RFC3339))\n\n\t\t\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\t\t\t\tn, hostDirs, err := ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> binary checkpointing failed: %s\", err.Error())\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d binary snapshot files created\", n)\n\t\t\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\t\t\tlastCheckpoint = now\n\t\t\t\t\t\tlastCheckpointMu.Unlock()\n\t\t\t\t\t\t// Rotate WAL files for successfully checkpointed hosts.\n\t\t\t\t\t\tRotateWALFiles(hostDirs)\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\tn, err := ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> checkpointing failed: %s\", err.Error())\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files created\", n)\n\t\t\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\t\t\tlastCheckpoint = now\n\t\t\t\t\t\tlastCheckpointMu.Unlock()\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}\n\n// MarshalJSON provides optimized JSON encoding for CheckpointMetrics.\n//\n// Since schema.Float has custom MarshalJSON, serializing []Float has significant overhead.\n// This method manually constructs JSON to avoid allocations and interface conversions.\nfunc (cm *CheckpointMetrics) MarshalJSON() ([]byte, error) {\n\tbuf := make([]byte, 0, 128+len(cm.Data)*8)\n\tbuf = append(buf, `{\"frequency\":`...)\n\tbuf = strconv.AppendInt(buf, cm.Frequency, 10)\n\tbuf = append(buf, `,\"start\":`...)\n\tbuf = strconv.AppendInt(buf, cm.Start, 10)\n\tbuf = append(buf, `,\"data\":[`...)\n\tfor i, x := range cm.Data {\n\t\tif i != 0 {\n\t\t\tbuf = append(buf, ',')\n\t\t}\n\t\tif x.IsNaN() {\n\t\t\tbuf = append(buf, `null`...)\n\t\t} else {\n\t\t\tbuf = strconv.AppendFloat(buf, float64(x), 'f', 1, 32)\n\t\t}\n\t}\n\tbuf = append(buf, `]}`...)\n\treturn buf, nil\n}\n\n// ToCheckpoint writes metric data to checkpoint files in parallel (JSON format).\n//\n// Metrics at root and cluster levels are skipped. One file per host is created.\n// Uses worker pool (Keys.NumWorkers) for parallel processing. Only locks one host\n// at a time, allowing concurrent writes/reads to other hosts.\n//\n// Returns the number of checkpoint files created and any errors encountered.\nfunc (m *MemoryStore) ToCheckpoint(dir string, from, to int64) (int, error) {\n\t// Pre-calculate capacity by counting cluster/host pairs\n\tm.root.lock.RLock()\n\ttotalHosts := 0\n\tfor _, l1 := range m.root.children {\n\t\tl1.lock.RLock()\n\t\ttotalHosts += len(l1.children)\n\t\tl1.lock.RUnlock()\n\t}\n\tm.root.lock.RUnlock()\n\n\tlevels := make([]*Level, 0, totalHosts)\n\tselectors := make([][]string, 0, totalHosts)\n\n\tm.root.lock.RLock()\n\tfor sel1, l1 := range m.root.children {\n\t\tl1.lock.RLock()\n\t\tfor sel2, l2 := range l1.children {\n\t\t\tlevels = append(levels, l2)\n\t\t\tselectors = append(selectors, []string{sel1, sel2})\n\t\t}\n\t\tl1.lock.RUnlock()\n\t}\n\tm.root.lock.RUnlock()\n\n\ttype workItem struct {\n\t\tlevel *Level\n\t\tdir string\n\t\tselector []string\n\t}\n\n\tn, errs := int32(0), int32(0)\n\n\tvar wg sync.WaitGroup\n\twg.Add(Keys.NumWorkers)\n\twork := make(chan workItem, Keys.NumWorkers*2)\n\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n\t\tgo func() {\n\t\t\tdefer wg.Done()\n\n\t\t\tfor workItem := range work {\n\t\t\t\tif err := workItem.level.toCheckpoint(workItem.dir, from, to, m); err != nil {\n\t\t\t\t\tif err == ErrNoNewArchiveData {\n\t\t\t\t\t\tcontinue\n\t\t\t\t\t}\n\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while checkpointing %#v: %s\", workItem.selector, err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t} else {\n\t\t\t\t\tatomic.AddInt32(&n, 1)\n\t\t\t\t}\n\t\t\t}\n\t\t}()\n\t}\n\n\tfor i := 0; i < len(levels); i++ {\n\t\tdir := path.Join(dir, path.Join(selectors[i]...))\n\t\twork <- workItem{\n\t\t\tlevel: levels[i],\n\t\t\tdir: dir,\n\t\t\tselector: selectors[i],\n\t\t}\n\t}\n\n\tclose(work)\n\twg.Wait()\n\n\tif errs > 0 {\n\t\treturn int(n), fmt.Errorf(\"[METRICSTORE]> %d errors happened while creating checkpoints (%d successes)\", errs, n)\n\t}\n\treturn int(n), nil\n}\n\n// toCheckpointFile recursively converts a Level tree to CheckpointFile structure.\n// Skips metrics that are already archived. Returns nil if no unarchived data exists.\nfunc (l *Level) toCheckpointFile(from, to int64, m *MemoryStore) (*CheckpointFile, error) {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tretval := &CheckpointFile{\n\t\tFrom: from,\n\t\tTo: to,\n\t\tMetrics: make(map[string]*CheckpointMetrics),\n\t\tChildren: make(map[string]*CheckpointFile),\n\t}\n\n\tfor metric, minfo := range m.Metrics {\n\t\tb := l.metrics[minfo.offset]\n\t\tif b == nil {\n\t\t\tcontinue\n\t\t}\n\n\t\tallArchived := true\n\t\tb.iterFromTo(from, to, func(b *buffer) error {\n\t\t\tif !b.archived {\n\t\t\t\tallArchived = false\n\t\t\t\treturn fmt.Errorf(\"stop\") // Early termination signal\n\t\t\t}\n\t\t\treturn nil\n\t\t})\n\n\t\tif allArchived {\n\t\t\tcontinue\n\t\t}\n\n\t\tdata := make([]schema.Float, (to-from)/b.frequency+1)\n\t\tdata, start, end, err := b.read(from, to, data)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\n\t\tfor i := int((end - start) / b.frequency); i < len(data); i++ {\n\t\t\tdata[i] = schema.NaN\n\t\t}\n\n\t\tretval.Metrics[metric] = &CheckpointMetrics{\n\t\t\tFrequency: b.frequency,\n\t\t\tStart: start,\n\t\t\tData: data,\n\t\t}\n\t}\n\n\tfor name, child := range l.children {\n\t\tval, err := child.toCheckpointFile(from, to, m)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\n\t\tif val != nil {\n\t\t\tretval.Children[name] = val\n\t\t}\n\t}\n\n\tif len(retval.Children) == 0 && len(retval.Metrics) == 0 {\n\t\treturn nil, nil\n\t}\n\n\treturn retval, nil\n}\n\n// toCheckpoint writes a Level's data to a JSON checkpoint file.\n// Creates directory if needed. Returns ErrNoNewArchiveData if nothing to save.\nfunc (l *Level) toCheckpoint(dir string, from, to int64, m *MemoryStore) error {\n\tcf, err := l.toCheckpointFile(from, to, m)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tif cf == nil {\n\t\treturn ErrNoNewArchiveData\n\t}\n\n\tfilepath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n\tf, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\tif err != nil && os.IsNotExist(err) {\n\t\terr = os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err == nil {\n\t\t\tf, err = os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\t\t}\n\t}\n\tif err != nil {\n\t\treturn err\n\t}\n\tdefer f.Close()\n\n\tbw := bufio.NewWriter(f)\n\tif err = json.NewEncoder(bw).Encode(cf); err != nil {\n\t\treturn err\n\t}\n\n\treturn bw.Flush()\n}\n\n// enqueueCheckpointHosts traverses checkpoint directory and enqueues cluster/host pairs.\n// Returns error if directory structure is invalid.\nfunc enqueueCheckpointHosts(dir string, work chan<- [2]string) error {\n\tclustersDir, err := os.ReadDir(dir)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tfor _, clusterDir := range clustersDir {\n\t\tif !clusterDir.IsDir() {\n\t\t\treturn errors.New(\"[METRICSTORE]> expected only directories at first level of checkpoints/ directory\")\n\t\t}\n\n\t\thostsDir, err := os.ReadDir(filepath.Join(dir, clusterDir.Name()))\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\tfor _, hostDir := range hostsDir {\n\t\t\tif !hostDir.IsDir() {\n\t\t\t\treturn errors.New(\"[METRICSTORE]> expected only directories at second level of checkpoints/ directory\")\n\t\t\t}\n\n\t\t\twork <- [2]string{clusterDir.Name(), hostDir.Name()}\n\t\t}\n\t}\n\n\treturn nil\n}\n\n// FromCheckpoint loads checkpoint files from disk into memory in parallel.\n//\n// Uses worker pool to load cluster/host combinations. Returns number of files\n// loaded and any errors.\nfunc (m *MemoryStore) FromCheckpoint(dir string, from int64) (int, error) {\n\tvar wg sync.WaitGroup\n\twork := make(chan [2]string, Keys.NumWorkers*4)\n\tn, errs := int32(0), int32(0)\n\n\twg.Add(Keys.NumWorkers)\n\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n\t\tgo func() {\n\t\t\tdefer wg.Done()\n\t\t\tfor host := range work {\n\t\t\t\tlvl := m.root.findLevelOrCreate(host[:], len(m.Metrics))\n\t\t\t\tnn, err := lvl.fromCheckpoint(m, filepath.Join(dir, host[0], host[1]), from)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while loading checkpoints for %s/%s: %s\", host[0], host[1], err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t}\n\t\t\t\tatomic.AddInt32(&n, int32(nn))\n\t\t\t}\n\t\t}()\n\t}\n\n\terr := enqueueCheckpointHosts(dir, work)\n\tclose(work)\n\twg.Wait()\n\n\tif err != nil {\n\t\treturn int(n), err\n\t}\n\n\tif errs > 0 {\n\t\treturn int(n), fmt.Errorf(\"[METRICSTORE]> %d errors happened while creating checkpoints (%d successes)\", errs, n)\n\t}\n\treturn int(n), nil\n}\n\n// FromCheckpointFiles is the main entry point for loading checkpoints at startup.\n//\n// Creates checkpoint directory if it doesn't exist. This function must be called\n// before any writes or reads, and can only be called once.\nfunc (m *MemoryStore) FromCheckpointFiles(dir string, from int64) (int, error) {\n\tif _, err := os.Stat(dir); os.IsNotExist(err) {\n\t\terr := os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err != nil {\n\t\t\tcclog.Fatalf(\"[METRICSTORE]> Error creating directory: %#v\\n\", err)\n\t\t}\n\t\tcclog.Debugf(\"[METRICSTORE]> %#v Directory created successfully\", dir)\n\t}\n\n\treturn m.FromCheckpoint(dir, from)\n}\n\nfunc (l *Level) loadJSONFile(m *MemoryStore, f *os.File, from int64) error {\n\tbr := bufio.NewReader(f)\n\tcf := &CheckpointFile{}\n\tif err := json.NewDecoder(br).Decode(cf); err != nil {\n\t\treturn err\n\t}\n\n\tif cf.To != 0 && cf.To < from {\n\t\treturn nil\n\t}\n\n\tif err := l.loadFile(cf, m); err != nil {\n\t\treturn err\n\t}\n\n\treturn nil\n}\n\nfunc (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {\n\tfor name, metric := range cf.Metrics {\n\t\tn := len(metric.Data)\n\t\tb := &buffer{\n\t\t\tfrequency: metric.Frequency,\n\t\t\tstart: metric.Start,\n\t\t\tdata: metric.Data[0:n:n],\n\t\t\tprev: nil,\n\t\t\tnext: nil,\n\t\t\tarchived: true,\n\t\t}\n\n\t\tminfo, ok := m.Metrics[name]\n\t\tif !ok {\n\t\t\tcontinue\n\t\t}\n\n\t\tprev := l.metrics[minfo.offset]\n\t\tif prev == nil {\n\t\t\tl.metrics[minfo.offset] = b\n\t\t} else {\n\t\t\tif prev.start > b.start {\n\t\t\t\treturn fmt.Errorf(\"[METRICSTORE]> buffer start time %d is before previous buffer start %d\", b.start, prev.start)\n\t\t\t}\n\n\t\t\tb.prev = prev\n\t\t\tprev.next = b\n\t\t}\n\t\tl.metrics[minfo.offset] = b\n\t}\n\n\tif len(cf.Children) > 0 && l.children == nil {\n\t\tl.children = make(map[string]*Level)\n\t}\n\n\tfor sel, childCf := range cf.Children {\n\t\tchild, ok := l.children[sel]\n\t\tif !ok {\n\t\t\tchild = &Level{\n\t\t\t\tmetrics: make([]*buffer, len(m.Metrics)),\n\t\t\t\tchildren: nil,\n\t\t\t}\n\t\t\tl.children[sel] = child\n\t\t}\n\n\t\tif err := child.loadFile(childCf, m); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\n\treturn nil\n}\n\n// fromCheckpoint loads all checkpoint files (JSON, binary snapshot, WAL) for a\n// single host directory. Snapshot files are loaded first (sorted by timestamp),\n// then current.wal is replayed on top.\nfunc (l *Level) fromCheckpoint(m *MemoryStore, dir string, from int64) (int, error) {\n\tdirentries, err := os.ReadDir(dir)\n\tif err != nil {\n\t\tif os.IsNotExist(err) {\n\t\t\treturn 0, nil\n\t\t}\n\t\treturn 0, err\n\t}\n\n\tallFiles := make([]fs.DirEntry, 0)\n\tvar walEntry fs.DirEntry\n\tfilesLoaded := 0\n\n\tfor _, e := range direntries {\n\t\tif e.IsDir() {\n\t\t\t// Legacy: skip subdirectories (only used by old Avro format).\n\t\t\t// These are ignored; their data is not loaded.\n\t\t\tcclog.Debugf(\"[METRICSTORE]> skipping subdirectory %s in checkpoint dir %s\", e.Name(), dir)\n\t\t\tcontinue\n\t\t}\n\n\t\tname := e.Name()\n\t\tif strings.HasSuffix(name, \".json\") || strings.HasSuffix(name, \".bin\") {\n\t\t\tallFiles = append(allFiles, e)\n\t\t} else if name == \"current.wal\" {\n\t\t\twalEntry = e\n\t\t}\n\t\t// Silently ignore other files (e.g., .tmp, .bin.tmp from interrupted writes).\n\t}\n\n\tfiles, err := findFiles(allFiles, from, true)\n\tif err != nil {\n\t\treturn filesLoaded, err\n\t}\n\n\tloaders := map[string]func(*MemoryStore, *os.File, int64) error{\n\t\t\".json\": l.loadJSONFile,\n\t\t\".bin\": l.loadBinaryFile,\n\t}\n\n\tfor _, filename := range files {\n\t\text := filepath.Ext(filename)\n\t\tloader := loaders[ext]\n\t\tif loader == nil {\n\t\t\tcclog.Warnf(\"[METRICSTORE]> unknown extension for checkpoint file %s\", filename)\n\t\t\tcontinue\n\t\t}\n\n\t\terr := func() error {\n\t\t\tf, err := os.Open(path.Join(dir, filename))\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\tdefer f.Close()\n\t\t\treturn loader(m, f, from)\n\t\t}()\n\t\tif err != nil {\n\t\t\treturn filesLoaded, err\n\t\t}\n\t\tfilesLoaded++\n\t}\n\n\t// Replay WAL after all snapshot files so it fills in data since the last snapshot.\n\tif walEntry != nil {\n\t\terr := func() error {\n\t\t\tf, err := os.Open(path.Join(dir, walEntry.Name()))\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\tdefer f.Close()\n\t\t\treturn l.loadWALFile(m, f, from)\n\t\t}()\n\t\tif err != nil {\n\t\t\t// WAL errors are non-fatal: the snapshot already loaded the bulk of data.\n\t\t\tcclog.Warnf(\"[METRICSTORE]> WAL replay error for %s: %v (data since last snapshot may be missing)\", dir, err)\n\t\t} else {\n\t\t\tfilesLoaded++\n\t\t}\n\t}\n\n\treturn filesLoaded, nil\n}\n\n// parseTimestampFromFilename extracts a Unix timestamp from a checkpoint filename.\n// Supports \".json\" (format: \".json\") and \".bin\" (format: \".bin\").\nfunc parseTimestampFromFilename(name string) (int64, error) {\n\tswitch {\n\tcase strings.HasSuffix(name, \".json\"):\n\t\treturn strconv.ParseInt(name[:len(name)-5], 10, 64)\n\tcase strings.HasSuffix(name, \".bin\"):\n\t\treturn strconv.ParseInt(name[:len(name)-4], 10, 64)\n\tdefault:\n\t\treturn 0, fmt.Errorf(\"unknown checkpoint extension for file %q\", name)\n\t}\n}\n\n// findFiles returns filenames from direntries whose timestamps satisfy the filter.\n// If findMoreRecentFiles is true, returns files with timestamps >= t (plus the\n// last file before t if t falls between two files).\nfunc findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {\n\tnums := map[string]int64{}\n\tfor _, e := range direntries {\n\t\tname := e.Name()\n\t\tif !strings.HasSuffix(name, \".json\") && !strings.HasSuffix(name, \".bin\") {\n\t\t\tcontinue\n\t\t}\n\n\t\tts, err := parseTimestampFromFilename(name)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\t\tnums[name] = ts\n\t}\n\n\tsort.Slice(direntries, func(i, j int) bool {\n\t\ta, b := direntries[i], direntries[j]\n\t\treturn nums[a.Name()] < nums[b.Name()]\n\t})\n\n\tif len(nums) == 0 {\n\t\treturn nil, nil\n\t}\n\n\tfilenames := make([]string, 0)\n\n\tfor i, e := range direntries {\n\t\tts1 := nums[e.Name()]\n\n\t\tif findMoreRecentFiles && t <= ts1 {\n\t\t\tfilenames = append(filenames, e.Name())\n\t\t} else if !findMoreRecentFiles && ts1 <= t && ts1 != 0 {\n\t\t\tfilenames = append(filenames, e.Name())\n\t\t}\n\n\t\tif i == len(direntries)-1 {\n\t\t\tcontinue\n\t\t}\n\n\t\tenext := direntries[i+1]\n\t\tts2 := nums[enext.Name()]\n\n\t\tif findMoreRecentFiles {\n\t\t\tif ts1 < t && t < ts2 {\n\t\t\t\tfilenames = append(filenames, e.Name())\n\t\t\t}\n\t\t}\n\t}\n\n\treturn filenames, nil\n}\n","structuredPatch":[{"oldStart":91,"oldLines":9,"newStart":91,"newLines":9,"lines":[" // Format behaviour:"," // - \"json\": Periodic checkpointing every checkpointInterval"," // - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval","-func Checkpointing(wg *sync.WaitGroup, ctx context.Context) {","+func Checkpointing(wg *sync.WaitGroup, ctx context.Context, restoreFrom time.Time) {"," lastCheckpointMu.Lock()","- lastCheckpoint = time.Now()","+ lastCheckpoint = restoreFrom"," lastCheckpointMu.Unlock()"," "," ms := GetMemoryStore()"]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"c23950e1-2fa7-447e-9f8e-2e07bc21e791","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"42207b2f-b752-4a27-8755-c21c64a7e600","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01AYfffpS88SbSUA5XAubwSZ","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01JFGrRmiRrqRBDevnYQZ72b","name":"Edit","input":{"replace_all":false,"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","old_string":"\t\tb := &buffer{\n\t\t\tfrequency: metric.Frequency,\n\t\t\tstart: metric.Start,\n\t\t\tdata: metric.Data[0:n:n],\n\t\t\tprev: nil,\n\t\t\tnext: nil,\n\t\t\tarchived: true,\n\t\t}","new_string":"\t\tb := &buffer{\n\t\t\tfrequency: metric.Frequency,\n\t\t\tstart: metric.Start,\n\t\t\tdata: metric.Data[0:n:n],\n\t\t\tprev: nil,\n\t\t\tnext: nil,\n\t\t\tarchived: false,\n\t\t}"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":330,"cache_read_input_tokens":38317,"output_tokens":232,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":330,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4VxxXBzS7YbZfey7ed","type":"assistant","uuid":"e7e429a6-6f73-4442-b1f6-6665f15508d5","timestamp":"2026-03-27T05:50:05.000Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"e7e429a6-6f73-4442-b1f6-6665f15508d5","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Edit","command":"callback"},"parentToolUseID":"toolu_01JFGrRmiRrqRBDevnYQZ72b","toolUseID":"toolu_01JFGrRmiRrqRBDevnYQZ72b","timestamp":"2026-03-27T05:50:05.015Z","uuid":"66b53994-875f-463e-9cab-d9899b4080e5","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"e7e429a6-6f73-4442-b1f6-6665f15508d5","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01JFGrRmiRrqRBDevnYQZ72b","type":"tool_result","content":"The file /Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go has been updated successfully."}]},"uuid":"cb476981-efbc-40ed-8d25-ccb4e9e33020","timestamp":"2026-03-27T05:50:05.014Z","toolUseResult":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","oldString":"\t\tb := &buffer{\n\t\t\tfrequency: metric.Frequency,\n\t\t\tstart: metric.Start,\n\t\t\tdata: metric.Data[0:n:n],\n\t\t\tprev: nil,\n\t\t\tnext: nil,\n\t\t\tarchived: true,\n\t\t}","newString":"\t\tb := &buffer{\n\t\t\tfrequency: metric.Frequency,\n\t\t\tstart: metric.Start,\n\t\t\tdata: metric.Data[0:n:n],\n\t\t\tprev: nil,\n\t\t\tnext: nil,\n\t\t\tarchived: false,\n\t\t}","originalFile":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// This file implements checkpoint persistence for the in-memory metric store.\n//\n// Checkpoints enable graceful restarts by periodically saving in-memory metric\n// data to disk in JSON or binary format. The checkpoint system:\n//\n// Key Features:\n// - Periodic background checkpointing via the Checkpointing() worker\n// - Two format families: JSON (human-readable) and WAL+binary (compact, crash-safe)\n// - Parallel checkpoint creation and loading using worker pools\n// - Hierarchical file organization: checkpoint_dir/cluster/host/timestamp.{json|bin}\n// - WAL file: checkpoint_dir/cluster/host/current.wal (append-only, per-entry)\n// - Only saves unarchived data (archived data is already persisted elsewhere)\n// - GC optimization during loading to prevent excessive heap growth\n//\n// Checkpoint Workflow:\n// 1. Init() loads checkpoints within retention window at startup\n// 2. Checkpointing() worker periodically saves new data\n// 3. Shutdown() writes final checkpoint before exit\n//\n// File Organization:\n//\n//\tcheckpoints/\n//\t cluster1/\n//\t host001/\n//\t 1234567890.json (JSON format: full subtree snapshot)\n//\t 1234567890.bin (binary format: full subtree snapshot)\n//\t current.wal (WAL format: append-only per-entry log)\n//\t host002/\n//\t ...\npackage metricstore\n\nimport (\n\t\"bufio\"\n\t\"context\"\n\t\"encoding/json\"\n\t\"errors\"\n\t\"fmt\"\n\t\"io/fs\"\n\t\"os\"\n\t\"path\"\n\t\"path/filepath\"\n\t\"sort\"\n\t\"strconv\"\n\t\"strings\"\n\t\"sync\"\n\t\"sync/atomic\"\n\t\"time\"\n\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n)\n\nconst (\n\tCheckpointFilePerms = 0o644 // File permissions for checkpoint files\n\tCheckpointDirPerms = 0o755 // Directory permissions for checkpoint directories\n\tGCTriggerInterval = DefaultGCTriggerInterval // Interval for triggering GC during checkpoint loading\n)\n\n// CheckpointMetrics represents metric data in a checkpoint file.\n// Whenever the structure changes, update MarshalJSON as well!\ntype CheckpointMetrics struct {\n\tData []schema.Float `json:\"data\"`\n\tFrequency int64 `json:\"frequency\"`\n\tStart int64 `json:\"start\"`\n}\n\n// CheckpointFile represents the hierarchical structure of a checkpoint file.\n// It mirrors the Level tree structure from the MemoryStore.\ntype CheckpointFile struct {\n\tMetrics map[string]*CheckpointMetrics `json:\"metrics\"`\n\tChildren map[string]*CheckpointFile `json:\"children\"`\n\tFrom int64 `json:\"from\"`\n\tTo int64 `json:\"to\"`\n}\n\n// lastCheckpoint tracks the timestamp of the last checkpoint creation.\nvar (\n\tlastCheckpoint time.Time\n\tlastCheckpointMu sync.Mutex\n)\n\n// Checkpointing starts a background worker that periodically saves metric data to disk.\n//\n// Checkpoints are written every 12 hours (hardcoded).\n//\n// Format behaviour:\n// - \"json\": Periodic checkpointing every checkpointInterval\n// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\nfunc Checkpointing(wg *sync.WaitGroup, ctx context.Context, restoreFrom time.Time) {\n\tlastCheckpointMu.Lock()\n\tlastCheckpoint = restoreFrom\n\tlastCheckpointMu.Unlock()\n\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\n\t\td := 12 * time.Hour // default checkpoint interval\n\t\tif Keys.CheckpointInterval != \"\" {\n\t\t\tparsed, err := time.ParseDuration(Keys.CheckpointInterval)\n\t\t\tif err != nil {\n\t\t\t\tcclog.Errorf(\"[METRICSTORE]> invalid checkpoint-interval %q: %s, using default 12h\", Keys.CheckpointInterval, err)\n\t\t\t} else {\n\t\t\t\td = parsed\n\t\t\t}\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\tfrom := lastCheckpoint\n\t\t\t\tlastCheckpointMu.Unlock()\n\n\t\t\t\tnow := time.Now()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start checkpointing (starting at %s)...\", from.Format(time.RFC3339))\n\n\t\t\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\t\t\t\tn, hostDirs, err := ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> binary checkpointing failed: %s\", err.Error())\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d binary snapshot files created\", n)\n\t\t\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\t\t\tlastCheckpoint = now\n\t\t\t\t\t\tlastCheckpointMu.Unlock()\n\t\t\t\t\t\t// Rotate WAL files for successfully checkpointed hosts.\n\t\t\t\t\t\tRotateWALFiles(hostDirs)\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\tn, err := ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> checkpointing failed: %s\", err.Error())\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files created\", n)\n\t\t\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\t\t\tlastCheckpoint = now\n\t\t\t\t\t\tlastCheckpointMu.Unlock()\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}\n\n// MarshalJSON provides optimized JSON encoding for CheckpointMetrics.\n//\n// Since schema.Float has custom MarshalJSON, serializing []Float has significant overhead.\n// This method manually constructs JSON to avoid allocations and interface conversions.\nfunc (cm *CheckpointMetrics) MarshalJSON() ([]byte, error) {\n\tbuf := make([]byte, 0, 128+len(cm.Data)*8)\n\tbuf = append(buf, `{\"frequency\":`...)\n\tbuf = strconv.AppendInt(buf, cm.Frequency, 10)\n\tbuf = append(buf, `,\"start\":`...)\n\tbuf = strconv.AppendInt(buf, cm.Start, 10)\n\tbuf = append(buf, `,\"data\":[`...)\n\tfor i, x := range cm.Data {\n\t\tif i != 0 {\n\t\t\tbuf = append(buf, ',')\n\t\t}\n\t\tif x.IsNaN() {\n\t\t\tbuf = append(buf, `null`...)\n\t\t} else {\n\t\t\tbuf = strconv.AppendFloat(buf, float64(x), 'f', 1, 32)\n\t\t}\n\t}\n\tbuf = append(buf, `]}`...)\n\treturn buf, nil\n}\n\n// ToCheckpoint writes metric data to checkpoint files in parallel (JSON format).\n//\n// Metrics at root and cluster levels are skipped. One file per host is created.\n// Uses worker pool (Keys.NumWorkers) for parallel processing. Only locks one host\n// at a time, allowing concurrent writes/reads to other hosts.\n//\n// Returns the number of checkpoint files created and any errors encountered.\nfunc (m *MemoryStore) ToCheckpoint(dir string, from, to int64) (int, error) {\n\t// Pre-calculate capacity by counting cluster/host pairs\n\tm.root.lock.RLock()\n\ttotalHosts := 0\n\tfor _, l1 := range m.root.children {\n\t\tl1.lock.RLock()\n\t\ttotalHosts += len(l1.children)\n\t\tl1.lock.RUnlock()\n\t}\n\tm.root.lock.RUnlock()\n\n\tlevels := make([]*Level, 0, totalHosts)\n\tselectors := make([][]string, 0, totalHosts)\n\n\tm.root.lock.RLock()\n\tfor sel1, l1 := range m.root.children {\n\t\tl1.lock.RLock()\n\t\tfor sel2, l2 := range l1.children {\n\t\t\tlevels = append(levels, l2)\n\t\t\tselectors = append(selectors, []string{sel1, sel2})\n\t\t}\n\t\tl1.lock.RUnlock()\n\t}\n\tm.root.lock.RUnlock()\n\n\ttype workItem struct {\n\t\tlevel *Level\n\t\tdir string\n\t\tselector []string\n\t}\n\n\tn, errs := int32(0), int32(0)\n\n\tvar wg sync.WaitGroup\n\twg.Add(Keys.NumWorkers)\n\twork := make(chan workItem, Keys.NumWorkers*2)\n\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n\t\tgo func() {\n\t\t\tdefer wg.Done()\n\n\t\t\tfor workItem := range work {\n\t\t\t\tif err := workItem.level.toCheckpoint(workItem.dir, from, to, m); err != nil {\n\t\t\t\t\tif err == ErrNoNewArchiveData {\n\t\t\t\t\t\tcontinue\n\t\t\t\t\t}\n\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while checkpointing %#v: %s\", workItem.selector, err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t} else {\n\t\t\t\t\tatomic.AddInt32(&n, 1)\n\t\t\t\t}\n\t\t\t}\n\t\t}()\n\t}\n\n\tfor i := 0; i < len(levels); i++ {\n\t\tdir := path.Join(dir, path.Join(selectors[i]...))\n\t\twork <- workItem{\n\t\t\tlevel: levels[i],\n\t\t\tdir: dir,\n\t\t\tselector: selectors[i],\n\t\t}\n\t}\n\n\tclose(work)\n\twg.Wait()\n\n\tif errs > 0 {\n\t\treturn int(n), fmt.Errorf(\"[METRICSTORE]> %d errors happened while creating checkpoints (%d successes)\", errs, n)\n\t}\n\treturn int(n), nil\n}\n\n// toCheckpointFile recursively converts a Level tree to CheckpointFile structure.\n// Skips metrics that are already archived. Returns nil if no unarchived data exists.\nfunc (l *Level) toCheckpointFile(from, to int64, m *MemoryStore) (*CheckpointFile, error) {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tretval := &CheckpointFile{\n\t\tFrom: from,\n\t\tTo: to,\n\t\tMetrics: make(map[string]*CheckpointMetrics),\n\t\tChildren: make(map[string]*CheckpointFile),\n\t}\n\n\tfor metric, minfo := range m.Metrics {\n\t\tb := l.metrics[minfo.offset]\n\t\tif b == nil {\n\t\t\tcontinue\n\t\t}\n\n\t\tallArchived := true\n\t\tb.iterFromTo(from, to, func(b *buffer) error {\n\t\t\tif !b.archived {\n\t\t\t\tallArchived = false\n\t\t\t\treturn fmt.Errorf(\"stop\") // Early termination signal\n\t\t\t}\n\t\t\treturn nil\n\t\t})\n\n\t\tif allArchived {\n\t\t\tcontinue\n\t\t}\n\n\t\tdata := make([]schema.Float, (to-from)/b.frequency+1)\n\t\tdata, start, end, err := b.read(from, to, data)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\n\t\tfor i := int((end - start) / b.frequency); i < len(data); i++ {\n\t\t\tdata[i] = schema.NaN\n\t\t}\n\n\t\tretval.Metrics[metric] = &CheckpointMetrics{\n\t\t\tFrequency: b.frequency,\n\t\t\tStart: start,\n\t\t\tData: data,\n\t\t}\n\t}\n\n\tfor name, child := range l.children {\n\t\tval, err := child.toCheckpointFile(from, to, m)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\n\t\tif val != nil {\n\t\t\tretval.Children[name] = val\n\t\t}\n\t}\n\n\tif len(retval.Children) == 0 && len(retval.Metrics) == 0 {\n\t\treturn nil, nil\n\t}\n\n\treturn retval, nil\n}\n\n// toCheckpoint writes a Level's data to a JSON checkpoint file.\n// Creates directory if needed. Returns ErrNoNewArchiveData if nothing to save.\nfunc (l *Level) toCheckpoint(dir string, from, to int64, m *MemoryStore) error {\n\tcf, err := l.toCheckpointFile(from, to, m)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tif cf == nil {\n\t\treturn ErrNoNewArchiveData\n\t}\n\n\tfilepath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n\tf, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\tif err != nil && os.IsNotExist(err) {\n\t\terr = os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err == nil {\n\t\t\tf, err = os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\t\t}\n\t}\n\tif err != nil {\n\t\treturn err\n\t}\n\tdefer f.Close()\n\n\tbw := bufio.NewWriter(f)\n\tif err = json.NewEncoder(bw).Encode(cf); err != nil {\n\t\treturn err\n\t}\n\n\treturn bw.Flush()\n}\n\n// enqueueCheckpointHosts traverses checkpoint directory and enqueues cluster/host pairs.\n// Returns error if directory structure is invalid.\nfunc enqueueCheckpointHosts(dir string, work chan<- [2]string) error {\n\tclustersDir, err := os.ReadDir(dir)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tfor _, clusterDir := range clustersDir {\n\t\tif !clusterDir.IsDir() {\n\t\t\treturn errors.New(\"[METRICSTORE]> expected only directories at first level of checkpoints/ directory\")\n\t\t}\n\n\t\thostsDir, err := os.ReadDir(filepath.Join(dir, clusterDir.Name()))\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\tfor _, hostDir := range hostsDir {\n\t\t\tif !hostDir.IsDir() {\n\t\t\t\treturn errors.New(\"[METRICSTORE]> expected only directories at second level of checkpoints/ directory\")\n\t\t\t}\n\n\t\t\twork <- [2]string{clusterDir.Name(), hostDir.Name()}\n\t\t}\n\t}\n\n\treturn nil\n}\n\n// FromCheckpoint loads checkpoint files from disk into memory in parallel.\n//\n// Uses worker pool to load cluster/host combinations. Returns number of files\n// loaded and any errors.\nfunc (m *MemoryStore) FromCheckpoint(dir string, from int64) (int, error) {\n\tvar wg sync.WaitGroup\n\twork := make(chan [2]string, Keys.NumWorkers*4)\n\tn, errs := int32(0), int32(0)\n\n\twg.Add(Keys.NumWorkers)\n\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n\t\tgo func() {\n\t\t\tdefer wg.Done()\n\t\t\tfor host := range work {\n\t\t\t\tlvl := m.root.findLevelOrCreate(host[:], len(m.Metrics))\n\t\t\t\tnn, err := lvl.fromCheckpoint(m, filepath.Join(dir, host[0], host[1]), from)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while loading checkpoints for %s/%s: %s\", host[0], host[1], err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t}\n\t\t\t\tatomic.AddInt32(&n, int32(nn))\n\t\t\t}\n\t\t}()\n\t}\n\n\terr := enqueueCheckpointHosts(dir, work)\n\tclose(work)\n\twg.Wait()\n\n\tif err != nil {\n\t\treturn int(n), err\n\t}\n\n\tif errs > 0 {\n\t\treturn int(n), fmt.Errorf(\"[METRICSTORE]> %d errors happened while creating checkpoints (%d successes)\", errs, n)\n\t}\n\treturn int(n), nil\n}\n\n// FromCheckpointFiles is the main entry point for loading checkpoints at startup.\n//\n// Creates checkpoint directory if it doesn't exist. This function must be called\n// before any writes or reads, and can only be called once.\nfunc (m *MemoryStore) FromCheckpointFiles(dir string, from int64) (int, error) {\n\tif _, err := os.Stat(dir); os.IsNotExist(err) {\n\t\terr := os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err != nil {\n\t\t\tcclog.Fatalf(\"[METRICSTORE]> Error creating directory: %#v\\n\", err)\n\t\t}\n\t\tcclog.Debugf(\"[METRICSTORE]> %#v Directory created successfully\", dir)\n\t}\n\n\treturn m.FromCheckpoint(dir, from)\n}\n\nfunc (l *Level) loadJSONFile(m *MemoryStore, f *os.File, from int64) error {\n\tbr := bufio.NewReader(f)\n\tcf := &CheckpointFile{}\n\tif err := json.NewDecoder(br).Decode(cf); err != nil {\n\t\treturn err\n\t}\n\n\tif cf.To != 0 && cf.To < from {\n\t\treturn nil\n\t}\n\n\tif err := l.loadFile(cf, m); err != nil {\n\t\treturn err\n\t}\n\n\treturn nil\n}\n\nfunc (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {\n\tfor name, metric := range cf.Metrics {\n\t\tn := len(metric.Data)\n\t\tb := &buffer{\n\t\t\tfrequency: metric.Frequency,\n\t\t\tstart: metric.Start,\n\t\t\tdata: metric.Data[0:n:n],\n\t\t\tprev: nil,\n\t\t\tnext: nil,\n\t\t\tarchived: true,\n\t\t}\n\n\t\tminfo, ok := m.Metrics[name]\n\t\tif !ok {\n\t\t\tcontinue\n\t\t}\n\n\t\tprev := l.metrics[minfo.offset]\n\t\tif prev == nil {\n\t\t\tl.metrics[minfo.offset] = b\n\t\t} else {\n\t\t\tif prev.start > b.start {\n\t\t\t\treturn fmt.Errorf(\"[METRICSTORE]> buffer start time %d is before previous buffer start %d\", b.start, prev.start)\n\t\t\t}\n\n\t\t\tb.prev = prev\n\t\t\tprev.next = b\n\t\t}\n\t\tl.metrics[minfo.offset] = b\n\t}\n\n\tif len(cf.Children) > 0 && l.children == nil {\n\t\tl.children = make(map[string]*Level)\n\t}\n\n\tfor sel, childCf := range cf.Children {\n\t\tchild, ok := l.children[sel]\n\t\tif !ok {\n\t\t\tchild = &Level{\n\t\t\t\tmetrics: make([]*buffer, len(m.Metrics)),\n\t\t\t\tchildren: nil,\n\t\t\t}\n\t\t\tl.children[sel] = child\n\t\t}\n\n\t\tif err := child.loadFile(childCf, m); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\n\treturn nil\n}\n\n// fromCheckpoint loads all checkpoint files (JSON, binary snapshot, WAL) for a\n// single host directory. Snapshot files are loaded first (sorted by timestamp),\n// then current.wal is replayed on top.\nfunc (l *Level) fromCheckpoint(m *MemoryStore, dir string, from int64) (int, error) {\n\tdirentries, err := os.ReadDir(dir)\n\tif err != nil {\n\t\tif os.IsNotExist(err) {\n\t\t\treturn 0, nil\n\t\t}\n\t\treturn 0, err\n\t}\n\n\tallFiles := make([]fs.DirEntry, 0)\n\tvar walEntry fs.DirEntry\n\tfilesLoaded := 0\n\n\tfor _, e := range direntries {\n\t\tif e.IsDir() {\n\t\t\t// Legacy: skip subdirectories (only used by old Avro format).\n\t\t\t// These are ignored; their data is not loaded.\n\t\t\tcclog.Debugf(\"[METRICSTORE]> skipping subdirectory %s in checkpoint dir %s\", e.Name(), dir)\n\t\t\tcontinue\n\t\t}\n\n\t\tname := e.Name()\n\t\tif strings.HasSuffix(name, \".json\") || strings.HasSuffix(name, \".bin\") {\n\t\t\tallFiles = append(allFiles, e)\n\t\t} else if name == \"current.wal\" {\n\t\t\twalEntry = e\n\t\t}\n\t\t// Silently ignore other files (e.g., .tmp, .bin.tmp from interrupted writes).\n\t}\n\n\tfiles, err := findFiles(allFiles, from, true)\n\tif err != nil {\n\t\treturn filesLoaded, err\n\t}\n\n\tloaders := map[string]func(*MemoryStore, *os.File, int64) error{\n\t\t\".json\": l.loadJSONFile,\n\t\t\".bin\": l.loadBinaryFile,\n\t}\n\n\tfor _, filename := range files {\n\t\text := filepath.Ext(filename)\n\t\tloader := loaders[ext]\n\t\tif loader == nil {\n\t\t\tcclog.Warnf(\"[METRICSTORE]> unknown extension for checkpoint file %s\", filename)\n\t\t\tcontinue\n\t\t}\n\n\t\terr := func() error {\n\t\t\tf, err := os.Open(path.Join(dir, filename))\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\tdefer f.Close()\n\t\t\treturn loader(m, f, from)\n\t\t}()\n\t\tif err != nil {\n\t\t\treturn filesLoaded, err\n\t\t}\n\t\tfilesLoaded++\n\t}\n\n\t// Replay WAL after all snapshot files so it fills in data since the last snapshot.\n\tif walEntry != nil {\n\t\terr := func() error {\n\t\t\tf, err := os.Open(path.Join(dir, walEntry.Name()))\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\tdefer f.Close()\n\t\t\treturn l.loadWALFile(m, f, from)\n\t\t}()\n\t\tif err != nil {\n\t\t\t// WAL errors are non-fatal: the snapshot already loaded the bulk of data.\n\t\t\tcclog.Warnf(\"[METRICSTORE]> WAL replay error for %s: %v (data since last snapshot may be missing)\", dir, err)\n\t\t} else {\n\t\t\tfilesLoaded++\n\t\t}\n\t}\n\n\treturn filesLoaded, nil\n}\n\n// parseTimestampFromFilename extracts a Unix timestamp from a checkpoint filename.\n// Supports \".json\" (format: \".json\") and \".bin\" (format: \".bin\").\nfunc parseTimestampFromFilename(name string) (int64, error) {\n\tswitch {\n\tcase strings.HasSuffix(name, \".json\"):\n\t\treturn strconv.ParseInt(name[:len(name)-5], 10, 64)\n\tcase strings.HasSuffix(name, \".bin\"):\n\t\treturn strconv.ParseInt(name[:len(name)-4], 10, 64)\n\tdefault:\n\t\treturn 0, fmt.Errorf(\"unknown checkpoint extension for file %q\", name)\n\t}\n}\n\n// findFiles returns filenames from direntries whose timestamps satisfy the filter.\n// If findMoreRecentFiles is true, returns files with timestamps >= t (plus the\n// last file before t if t falls between two files).\nfunc findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {\n\tnums := map[string]int64{}\n\tfor _, e := range direntries {\n\t\tname := e.Name()\n\t\tif !strings.HasSuffix(name, \".json\") && !strings.HasSuffix(name, \".bin\") {\n\t\t\tcontinue\n\t\t}\n\n\t\tts, err := parseTimestampFromFilename(name)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\t\tnums[name] = ts\n\t}\n\n\tsort.Slice(direntries, func(i, j int) bool {\n\t\ta, b := direntries[i], direntries[j]\n\t\treturn nums[a.Name()] < nums[b.Name()]\n\t})\n\n\tif len(nums) == 0 {\n\t\treturn nil, nil\n\t}\n\n\tfilenames := make([]string, 0)\n\n\tfor i, e := range direntries {\n\t\tts1 := nums[e.Name()]\n\n\t\tif findMoreRecentFiles && t <= ts1 {\n\t\t\tfilenames = append(filenames, e.Name())\n\t\t} else if !findMoreRecentFiles && ts1 <= t && ts1 != 0 {\n\t\t\tfilenames = append(filenames, e.Name())\n\t\t}\n\n\t\tif i == len(direntries)-1 {\n\t\t\tcontinue\n\t\t}\n\n\t\tenext := direntries[i+1]\n\t\tts2 := nums[enext.Name()]\n\n\t\tif findMoreRecentFiles {\n\t\t\tif ts1 < t && t < ts2 {\n\t\t\t\tfilenames = append(filenames, e.Name())\n\t\t\t}\n\t\t}\n\t}\n\n\treturn filenames, nil\n}\n","structuredPatch":[{"oldStart":470,"oldLines":7,"newStart":470,"newLines":7,"lines":[" data: metric.Data[0:n:n],"," prev: nil,"," next: nil,","- archived: true,","+ archived: false,"," }"," "," minfo, ok := m.Metrics[name]"]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"e7e429a6-6f73-4442-b1f6-6665f15508d5","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} 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successfully."}]},"uuid":"bc54ba35-8b7f-4b5c-8501-cc18f19c84b5","timestamp":"2026-03-27T05:50:09.957Z","toolUseResult":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/metricstore.go","oldString":"\tRetention(wg, ctx)\n\tCheckpointing(wg, ctx)","newString":"\tRetention(wg, ctx)\n\tCheckpointing(wg, ctx, restoreFrom)","originalFile":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// Package metricstore provides an efficient in-memory time-series metric storage system\n// with support for hierarchical data organization, checkpointing, and archiving.\n//\n// The package organizes metrics in a tree structure (cluster → host → component) and\n// provides concurrent read/write access to metric data with configurable aggregation strategies.\n// Background goroutines handle periodic checkpointing (JSON or Avro format), archiving old data,\n// and enforcing retention policies.\n//\n// Key features:\n// - In-memory metric storage with configurable retention\n// - Hierarchical data organization (selectors)\n// - Concurrent checkpoint/archive workers\n// - Support for sum and average aggregation\n// - NATS integration for metric ingestion\npackage metricstore\n\nimport (\n\t\"bytes\"\n\t\"context\"\n\t\"encoding/json\"\n\t\"errors\"\n\t\"fmt\"\n\t\"runtime\"\n\t\"runtime/debug\"\n\t\"slices\"\n\t\"sync\"\n\t\"time\"\n\n\t\"github.com/ClusterCockpit/cc-backend/internal/config\"\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/resampler\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/util\"\n)\n\n// GlobalState holds the global state for the metric store with thread-safe access.\ntype GlobalState struct {\n\tmu sync.RWMutex\n\tlastRetentionTime int64\n\tselectorsExcluded bool\n}\n\nvar (\n\tsingleton sync.Once\n\tmsInstance *MemoryStore\n\t// shutdownFunc stores the context cancellation function created in Init\n\t// and is called during Shutdown to cancel all background goroutines\n\tshutdownFunc context.CancelFunc\n\tshutdownFuncMu sync.Mutex // Protects shutdownFunc from concurrent access\n\t// Create a global instance\n\tstate = &GlobalState{}\n)\n\n// NodeProvider provides information about nodes currently in use by running jobs.\n//\n// This interface allows metricstore to query job information without directly\n// depending on the repository package, breaking the import cycle.\n//\n// Implementations should return nodes that are actively processing jobs started\n// before the given timestamp. These nodes will be excluded from retention-based\n// garbage collection to prevent data loss for jobs that are still running or\n// recently completed.\ntype NodeProvider interface {\n\t// GetUsedNodes returns a map of cluster names to sorted lists of unique hostnames\n\t// that are currently in use by jobs that started before the given timestamp.\n\t//\n\t// Parameters:\n\t// - ts: Unix timestamp threshold - returns nodes with jobs started before this time\n\t//\n\t// Returns:\n\t// - Map of cluster names to lists of node hostnames that should be excluded from garbage collection\n\t// - Error if the query fails\n\tGetUsedNodes(ts int64) (map[string][]string, error)\n}\n\n// Metric represents a single metric data point to be written to the store.\ntype Metric struct {\n\tName string\n\tValue schema.Float\n\t// MetricConfig contains frequency and aggregation settings for this metric.\n\t// If Frequency is 0, configuration will be looked up from MemoryStore.Metrics during Write().\n\tMetricConfig MetricConfig\n}\n\n// MemoryStore is the main in-memory time-series metric storage implementation.\n//\n// It organizes metrics in a hierarchical tree structure where each level represents\n// a component of the system hierarchy (e.g., cluster → host → CPU). Each level can\n// store multiple metrics as time-series buffers.\n//\n// The store is initialized as a singleton via InitMetrics() and accessed via GetMemoryStore().\n// All public methods are safe for concurrent use.\ntype MemoryStore struct {\n\tMetrics map[string]MetricConfig\n\troot Level\n\tnodeProvider NodeProvider\n}\n\n// Init initializes the metric store from configuration and starts background workers.\n//\n// This function must be called exactly once before any other metricstore operations.\n// It performs the following initialization steps:\n// 1. Validates and decodes the metric store configuration\n// 2. Configures worker pool size (defaults to NumCPU/2+1, max 10)\n// 3. Loads metric configurations from all registered clusters\n// 4. Restores checkpoints within the retention window\n// 5. Starts background workers for retention, checkpointing, archiving, and monitoring\n// 6. Optionally subscribes to NATS for real-time metric ingestion\n//\n// Parameters:\n// - rawConfig: JSON configuration for the metric store (see MetricStoreConfig)\n// - wg: WaitGroup that will be incremented for each background goroutine started\n//\n// The function will call cclog.Fatal on critical errors during initialization.\n// Use Shutdown() to cleanly stop all background workers started by Init().\n//\n// Note: Signal handling must be implemented by the caller. Call Shutdown() when\n// receiving termination signals to ensure checkpoint data is persisted.\nfunc Init(rawConfig json.RawMessage, metrics map[string]MetricConfig, wg *sync.WaitGroup) {\n\tstartupTime := time.Now()\n\n\tif rawConfig != nil {\n\t\tconfig.Validate(configSchema, rawConfig)\n\t\tdec := json.NewDecoder(bytes.NewReader(rawConfig))\n\t\tdec.DisallowUnknownFields()\n\t\tif err := dec.Decode(&Keys); err != nil {\n\t\t\tcclog.Abortf(\"[METRICSTORE]> Metric Store Config Init: Could not decode config file '%s'.\\nError: %s\\n\", rawConfig, err.Error())\n\t\t}\n\t}\n\n\t// Set NumWorkers from config or use default\n\tif Keys.NumWorkers <= 0 {\n\t\tKeys.NumWorkers = min(runtime.NumCPU()/2+1, DefaultMaxWorkers)\n\t}\n\tcclog.Debugf(\"[METRICSTORE]> Using %d workers for checkpoint/archive operations\\n\", Keys.NumWorkers)\n\n\t// Pass the config.MetricStoreKeys\n\tInitMetrics(metrics)\n\n\tms := GetMemoryStore()\n\n\td, err := time.ParseDuration(Keys.RetentionInMemory)\n\tif err != nil {\n\t\tcclog.Fatal(err)\n\t}\n\n\trestoreFrom := startupTime.Add(-d)\n\tcclog.Infof(\"[METRICSTORE]> Loading checkpoints newer than %s\\n\", restoreFrom.Format(time.RFC3339))\n\tfiles, err := ms.FromCheckpointFiles(Keys.Checkpoints.RootDir, restoreFrom.Unix())\n\tloadedData := ms.SizeInBytes() / 1024 / 1024 // In MB\n\tif err != nil {\n\t\tcclog.Fatalf(\"[METRICSTORE]> Loading checkpoints failed: %s\\n\", err.Error())\n\t} else {\n\t\tcclog.Infof(\"[METRICSTORE]> Checkpoints loaded (%d files, %d MB, that took %fs)\\n\", files, loadedData, time.Since(startupTime).Seconds())\n\t}\n\n\t// Try to use less memory by forcing a GC run here and then\n\t// lowering the target percentage. The default of 100 means\n\t// that only once the ratio of new allocations execeds the\n\t// previously active heap, a GC is triggered.\n\t// Forcing a GC here will set the \"previously active heap\"\n\t// to a minumum.\n\t// runtime.GC()\n\n\tctx, shutdown := context.WithCancel(context.Background())\n\n\tRetention(wg, ctx)\n\tCheckpointing(wg, ctx)\n\tCleanUp(wg, ctx)\n\tWALStaging(wg, ctx)\n\tMemoryUsageTracker(wg, ctx)\n\n\t// Note: Signal handling has been removed from this function.\n\t// The caller is responsible for handling shutdown signals and calling\n\t// the shutdown() function when appropriate.\n\t// Store the shutdown function for later use by Shutdown()\n\tshutdownFuncMu.Lock()\n\tshutdownFunc = shutdown\n\tshutdownFuncMu.Unlock()\n\n\tif Keys.Subscriptions != nil {\n\t\twg.Go(func() {\n\t\t\tif err := ReceiveNats(ms, Keys.NumWorkers, ctx); err != nil {\n\t\t\t\tcclog.Fatal(err)\n\t\t\t}\n\t\t})\n\t}\n}\n\n// InitMetrics initializes the singleton MemoryStore instance with the given metric configurations.\n//\n// This function must be called before GetMemoryStore() and can only be called once due to\n// the singleton pattern. It assigns each metric an internal offset for efficient buffer indexing.\n//\n// Parameters:\n// - metrics: Map of metric names to their configurations (frequency and aggregation strategy)\n//\n// Panics if any metric has Frequency == 0, which indicates an invalid configuration.\n//\n// After this call, the global msInstance is ready for use via GetMemoryStore().\nfunc InitMetrics(metrics map[string]MetricConfig) {\n\tsingleton.Do(func() {\n\t\toffset := 0\n\t\tfor key, cfg := range metrics {\n\t\t\tif cfg.Frequency == 0 {\n\t\t\t\tpanic(\"[METRICSTORE]> invalid frequency\")\n\t\t\t}\n\n\t\t\tmetrics[key] = MetricConfig{\n\t\t\t\tFrequency: cfg.Frequency,\n\t\t\t\tAggregation: cfg.Aggregation,\n\t\t\t\toffset: offset,\n\t\t\t}\n\t\t\toffset += 1\n\t\t}\n\n\t\tmsInstance = &MemoryStore{\n\t\t\troot: Level{\n\t\t\t\tmetrics: make([]*buffer, len(metrics)),\n\t\t\t\tchildren: make(map[string]*Level),\n\t\t\t},\n\t\t\tMetrics: metrics,\n\t\t}\n\t})\n}\n\n// GetMemoryStore returns the singleton MemoryStore instance.\n//\n// Returns the initialized MemoryStore singleton. Calls cclog.Fatal if InitMetrics() was not called first.\n//\n// This function is safe for concurrent use after initialization.\nfunc GetMemoryStore() *MemoryStore {\n\tif msInstance == nil {\n\t\tcclog.Warnf(\"[METRICSTORE]> MemoryStore not initialized!\")\n\t}\n\n\treturn msInstance\n}\n\nfunc (ms *MemoryStore) GetMetricFrequency(metricName string) (int64, error) {\n\tif metric, ok := ms.Metrics[metricName]; ok {\n\t\treturn metric.Frequency, nil\n\t}\n\treturn 0, fmt.Errorf(\"[METRICSTORE]> metric %s not found\", metricName)\n}\n\n// SetNodeProvider sets the NodeProvider implementation for the MemoryStore.\n// This must be called during initialization to provide job state information\n// for selective buffer retention during Free operations.\n// If not set, the Free function will fall back to freeing all buffers.\nfunc (ms *MemoryStore) SetNodeProvider(provider NodeProvider) {\n\tms.nodeProvider = provider\n}\n\n// Shutdown performs a graceful shutdown of the metric store.\n//\n// This function cancels all background goroutines started by Init() and writes\n// a final checkpoint to disk before returning. It should be called when the\n// application receives a termination signal.\n//\n// The function will:\n// 1. Cancel the context to stop all background workers\n// 2. Close the WAL messages channel if using WAL format\n// 3. Write a final checkpoint to preserve in-memory data\n// 4. Log any errors encountered during shutdown\n//\n// Note: This function blocks until the final checkpoint is written.\nfunc Shutdown() {\n\ttotalStart := time.Now()\n\n\tshutdownFuncMu.Lock()\n\tdefer shutdownFuncMu.Unlock()\n\tif shutdownFunc != nil {\n\t\tshutdownFunc()\n\t}\n\tcclog.Infof(\"[METRICSTORE]> Background workers cancelled (%v)\", time.Since(totalStart))\n\n\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\t// Signal producers to stop sending before closing channels,\n\t\t// preventing send-on-closed-channel panics from in-flight NATS workers.\n\t\twalShuttingDown.Store(true)\n\t\t// Brief grace period for in-flight DecodeLine calls to complete.\n\t\ttime.Sleep(100 * time.Millisecond)\n\n\t\tfor _, ch := range walShardChs {\n\t\t\tclose(ch)\n\t\t}\n\t\tdrainStart := time.Now()\n\t\tWaitForWALStagingDrain()\n\t\tcclog.Infof(\"[METRICSTORE]> WAL staging goroutines exited (%v)\", time.Since(drainStart))\n\t}\n\n\tcclog.Infof(\"[METRICSTORE]> Writing checkpoint to '%s'...\", Keys.Checkpoints.RootDir)\n\tcheckpointStart := time.Now()\n\tvar files int\n\tvar err error\n\n\tms := GetMemoryStore()\n\n\tlastCheckpointMu.Lock()\n\tfrom := lastCheckpoint\n\tlastCheckpointMu.Unlock()\n\n\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\t// WAL files are deleted per-host inside ToCheckpointWAL workers.\n\t\tfiles, _, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n\t} else {\n\t\tfiles, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n\t}\n\n\tif err != nil {\n\t\tcclog.Errorf(\"[METRICSTORE]> Writing checkpoint failed: %s\", err.Error())\n\t}\n\tcclog.Infof(\"[METRICSTORE]> Done! (%d files written in %v, total shutdown: %v)\", files, time.Since(checkpointStart), time.Since(totalStart))\n}\n\n// Retention starts a background goroutine that periodically frees old metric data.\n//\n// This worker runs at half the retention interval and calls Free() to remove buffers\n// older than the configured retention time. It respects the NodeProvider to preserve\n// data for nodes with active jobs.\n//\n// Parameters:\n// - wg: WaitGroup to signal completion when context is cancelled\n// - ctx: Context for cancellation signal\n//\n// The goroutine exits when ctx is cancelled.\nfunc Retention(wg *sync.WaitGroup, ctx context.Context) {\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\t\td, err := time.ParseDuration(Keys.RetentionInMemory)\n\t\tif err != nil {\n\t\t\tcclog.Fatal(err)\n\t\t}\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\ttickInterval := d / 2\n\t\tif tickInterval <= 0 {\n\t\t\treturn\n\t\t}\n\t\tticker := time.NewTicker(tickInterval)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tstate.mu.Lock()\n\n\t\t\t\tt := time.Now().Add(-d)\n\n\t\t\t\tstate.lastRetentionTime = t.Unix()\n\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start freeing buffers (older than %s)...\\n\", t.Format(time.RFC3339))\n\n\t\t\t\tfreed, err := Free(ms, t)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> freeing up buffers failed: %s\\n\", err.Error())\n\t\t\t\t} else {\n\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d buffers freed\\n\", freed)\n\t\t\t\t}\n\n\t\t\t\tstate.mu.Unlock()\n\n\t\t\t\t// Clean up the buffer pool\n\t\t\t\tbufferPool.Clean(state.lastRetentionTime)\n\t\t\t}\n\t\t}\n\t})\n}\n\n// MemoryUsageTracker starts a background goroutine that monitors memory usage.\n//\n// This worker checks actual process memory usage (via runtime.MemStats) periodically\n// and force-frees buffers if memory exceeds the configured cap. It uses FreeOSMemory()\n// to return memory to the OS after freeing buffers, avoiding aggressive GC that causes\n// performance issues.\n//\n// The tracker logs both actual memory usage (heap allocated) and metric data size for\n// visibility into memory overhead from Go runtime structures and allocations.\n//\n// Parameters:\n// - wg: WaitGroup to signal completion when context is cancelled\n// - ctx: Context for cancellation signal\n//\n// The goroutine exits when ctx is cancelled.\nfunc MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\t\tnormalInterval := DefaultMemoryUsageTrackerInterval\n\t\tfastInterval := 30 * time.Second\n\n\t\tif normalInterval <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\tticker := time.NewTicker(normalInterval)\n\t\tdefer ticker.Stop()\n\t\tcurrentInterval := normalInterval\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tvar mem runtime.MemStats\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB := float64(mem.Alloc) / 1e9\n\t\t\t\tmetricDataGB := ms.SizeInGB()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory usage: %.2f GB actual (%.2f GB metric data)\", actualMemoryGB, metricDataGB)\n\n\t\t\t\tfreedExcluded := 0\n\t\t\t\tfreedEmergency := 0\n\t\t\t\tvar err error\n\n\t\t\t\tstate.mu.RLock()\n\t\t\t\tlastRetention := state.lastRetentionTime\n\t\t\t\tselectorsExcluded := state.selectorsExcluded\n\t\t\t\tstate.mu.RUnlock()\n\n\t\t\t\tif lastRetention != 0 && selectorsExcluded {\n\t\t\t\t\tfreedExcluded, err = ms.Free(nil, lastRetention)\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing the excluded buffers: %s\", err)\n\t\t\t\t\t}\n\n\t\t\t\t\tif freedExcluded > 0 {\n\t\t\t\t\t\tdebug.FreeOSMemory()\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d excluded buffers force-freed\", freedExcluded)\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\tif actualMemoryGB > float64(Keys.MemoryCap) {\n\t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> memory usage %.2f GB exceeds cap %d GB, starting emergency buffer freeing\", actualMemoryGB, Keys.MemoryCap)\n\n\t\t\t\t\t// Use progressive time-based Free with increasing threshold\n\t\t\t\t\t// instead of ForceFree loop — fewer tree traversals, more effective\n\t\t\t\t\td, parseErr := time.ParseDuration(Keys.RetentionInMemory)\n\t\t\t\t\tif parseErr != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> cannot parse retention duration: %s\", parseErr)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tthresholds := []float64{0.75, 0.5, 0.25}\n\t\t\t\t\t\tfor _, fraction := range thresholds {\n\t\t\t\t\t\t\tthreshold := time.Now().Add(-time.Duration(float64(d) * fraction))\n\t\t\t\t\t\t\tfreed, freeErr := ms.Free(nil, threshold.Unix())\n\t\t\t\t\t\t\tif freeErr != nil {\n\t\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while freeing buffers at %.0f%% retention: %s\", fraction*100, freeErr)\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\tfreedEmergency += freed\n\n\t\t\t\t\t\t\tbufferPool.Clear()\n\t\t\t\t\t\t\truntime.GC()\n\t\t\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n\t\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\tbufferPool.Clear()\n\t\t\t\t\tdebug.FreeOSMemory()\n\n\t\t\t\t\truntime.ReadMemStats(&mem)\n\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n\n\t\t\t\t\tif actualMemoryGB >= float64(Keys.MemoryCap) {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> after emergency frees (%d buffers), memory usage %.2f GB still at/above cap %d GB\", freedEmergency, actualMemoryGB, Keys.MemoryCap)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> emergency freeing complete: %d buffers freed, memory now %.2f GB\", freedEmergency, actualMemoryGB)\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Adaptive ticker: check more frequently when memory is high\n\t\t\t\tmemoryRatio := actualMemoryGB / float64(Keys.MemoryCap)\n\t\t\t\tif memoryRatio > 0.8 && currentInterval != fastInterval {\n\t\t\t\t\tticker.Reset(fastInterval)\n\t\t\t\t\tcurrentInterval = fastInterval\n\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to fast check interval (30s)\", memoryRatio*100)\n\t\t\t\t} else if memoryRatio <= 0.8 && currentInterval != normalInterval {\n\t\t\t\t\tticker.Reset(normalInterval)\n\t\t\t\t\tcurrentInterval = normalInterval\n\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to normal check interval\", memoryRatio*100)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}\n\n// Free removes metric data older than the given time while preserving data for active nodes.\n//\n// This function implements intelligent retention by consulting the NodeProvider (if configured)\n// to determine which nodes are currently in use by running jobs. Data for these nodes is\n// preserved even if older than the retention time.\n//\n// Parameters:\n// - ms: The MemoryStore instance\n// - t: Time threshold - buffers with data older than this will be freed\n//\n// Returns:\n// - Number of buffers freed\n// - Error if NodeProvider query fails\n//\n// Behavior:\n// - If no NodeProvider is set: frees all buffers older than t\n// - If NodeProvider returns empty map: frees all buffers older than t\n// - Otherwise: preserves buffers for nodes returned by GetUsedNodes(), frees others\nfunc Free(ms *MemoryStore, t time.Time) (int, error) {\n\t// If no NodeProvider is configured, free all buffers older than t\n\tif ms.nodeProvider == nil {\n\t\treturn ms.Free(nil, t.Unix())\n\t}\n\n\texcludeSelectors, err := ms.nodeProvider.GetUsedNodes(t.Unix())\n\tif err != nil {\n\t\treturn 0, err\n\t}\n\n\tswitch lenMap := len(excludeSelectors); lenMap {\n\n\t// If the length of the map returned by GetUsedNodes() is 0,\n\t// then use default Free method with nil selector\n\tcase 0:\n\t\tstate.selectorsExcluded = false\n\t\treturn ms.Free(nil, t.Unix())\n\n\t// Else formulate selectors, exclude those from the map\n\t// and free the rest of the selectors\n\tdefault:\n\t\tstate.selectorsExcluded = true\n\t\tselectors := GetSelectors(ms, excludeSelectors)\n\t\treturn FreeSelected(ms, selectors, t)\n\t}\n}\n\n// FreeSelected frees buffers for specific selectors while preserving others.\n//\n// This function is used when we want to retain some specific nodes beyond the retention time.\n// It iterates through the provided selectors and frees their associated buffers.\n//\n// Parameters:\n// - ms: The MemoryStore instance\n// - selectors: List of selector paths to free (e.g., [[\"cluster1\", \"node1\"], [\"cluster2\", \"node2\"]])\n// - t: Time threshold for freeing buffers\n//\n// Returns the total number of buffers freed and any error encountered.\nfunc FreeSelected(ms *MemoryStore, selectors [][]string, t time.Time) (int, error) {\n\tfreed := 0\n\n\tfor _, selector := range selectors {\n\n\t\tfreedBuffers, err := ms.Free(selector, t.Unix())\n\t\tif err != nil {\n\t\t\tcclog.Errorf(\"error while freeing selected buffers: %#v\", err)\n\t\t}\n\t\tfreed += freedBuffers\n\n\t}\n\n\treturn freed, nil\n}\n\n// GetSelectors returns all selectors at depth 2 (cluster/node level) that are NOT in the exclusion map.\n//\n// This function generates a list of selectors whose buffers should be freed by excluding\n// selectors that correspond to nodes currently in use by running jobs.\n//\n// Parameters:\n// - ms: The MemoryStore instance\n// - excludeSelectors: Map of cluster names to node hostnames that should NOT be freed\n//\n// Returns a list of selectors ([]string paths) that can be safely freed.\n//\n// Example:\n//\n//\tIf the tree has paths [\"emmy\", \"node001\"] and [\"emmy\", \"node002\"],\n//\tand excludeSelectors contains {\"emmy\": [\"node001\"]},\n//\tthen only [[\"emmy\", \"node002\"]] is returned.\nfunc GetSelectors(ms *MemoryStore, excludeSelectors map[string][]string) [][]string {\n\tallSelectors := ms.GetPaths(2)\n\n\tfilteredSelectors := make([][]string, 0, len(allSelectors))\n\n\tfor _, path := range allSelectors {\n\t\tif len(path) < 2 {\n\t\t\tcontinue\n\t\t}\n\n\t\tkey := path[0] // The \"Key\" (Level 1)\n\t\tvalue := path[1] // The \"Value\" (Level 2)\n\n\t\texclude := false\n\n\t\t// Check if the key exists in our exclusion map\n\t\tif excludedValues, exists := excludeSelectors[key]; exists {\n\t\t\t// The key exists, now check if the specific value is in the exclusion list\n\t\t\tif slices.Contains(excludedValues, value) {\n\t\t\t\texclude = true\n\t\t\t}\n\t\t}\n\n\t\tif !exclude {\n\t\t\tfilteredSelectors = append(filteredSelectors, path)\n\t\t}\n\t}\n\n\treturn filteredSelectors\n}\n\n// GetPaths returns a list of lists (paths) to the specified depth.\nfunc (ms *MemoryStore) GetPaths(targetDepth int) [][]string {\n\tvar results [][]string\n\n\t// Start recursion. Initial path is empty.\n\t// We treat Root as depth 0.\n\tms.root.collectPaths(0, targetDepth, []string{}, &results)\n\n\treturn results\n}\n\n// Write all values in `metrics` to the level specified by `selector` for time `ts`.\n// Look at `findLevelOrCreate` for how selectors work.\nfunc (m *MemoryStore) Write(selector []string, ts int64, metrics []Metric) error {\n\tvar ok bool\n\tfor i, metric := range metrics {\n\t\tif metric.MetricConfig.Frequency == 0 {\n\t\t\tmetric.MetricConfig, ok = m.Metrics[metric.Name]\n\t\t\tif !ok {\n\t\t\t\tcclog.Debugf(\"[METRICSTORE]> Unknown metric '%s' in Write() - skipping\", metric.Name)\n\t\t\t\tmetric.MetricConfig.Frequency = 0\n\t\t\t}\n\t\t\tmetrics[i] = metric\n\t\t}\n\t}\n\n\treturn m.WriteToLevel(&m.root, selector, ts, metrics)\n}\n\nfunc (m *MemoryStore) GetLevel(selector []string) *Level {\n\treturn m.root.findLevelOrCreate(selector, len(m.Metrics))\n}\n\n// WriteToLevel assumes that `minfo` in `metrics` is filled in\nfunc (m *MemoryStore) WriteToLevel(l *Level, selector []string, ts int64, metrics []Metric) error {\n\tl = l.findLevelOrCreate(selector, len(m.Metrics))\n\tl.lock.Lock()\n\tdefer l.lock.Unlock()\n\n\tfor _, metric := range metrics {\n\t\tif metric.MetricConfig.Frequency == 0 {\n\t\t\tcontinue\n\t\t}\n\n\t\tb := l.metrics[metric.MetricConfig.offset]\n\t\tif b == nil {\n\t\t\t// First write to this metric and level\n\t\t\tb = newBuffer(ts, metric.MetricConfig.Frequency)\n\t\t\tl.metrics[metric.MetricConfig.offset] = b\n\t\t}\n\n\t\tnb, err := b.write(ts, metric.Value)\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\t// Last write created a new buffer...\n\t\tif b != nb {\n\t\t\tl.metrics[metric.MetricConfig.offset] = nb\n\t\t}\n\t}\n\treturn nil\n}\n\n// Read returns all values for metric `metric` from `from` to `to` for the selected level(s).\n// If the level does not hold the metric itself, the data will be aggregated recursively from the children.\n// The second and third return value are the actual from/to for the data. Those can be different from\n// the range asked for if no data was available.\nfunc (m *MemoryStore) Read(selector util.Selector, metric string, from, to, resolution int64) ([]schema.Float, int64, int64, int64, error) {\n\tif from > to {\n\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> invalid time range\")\n\t}\n\n\tminfo, ok := m.Metrics[metric]\n\tif !ok {\n\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> unknown metric: \" + metric)\n\t}\n\n\tn, data := 0, make([]schema.Float, (to-from)/minfo.Frequency+1)\n\n\terr := m.root.findBuffers(selector, minfo.offset, func(b *buffer) error {\n\t\tcdata, cfrom, cto, err := b.read(from, to, data)\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\tif n == 0 {\n\t\t\tfrom, to = cfrom, cto\n\t\t} else if from != cfrom || to != cto || len(data) != len(cdata) {\n\t\t\tmissingfront, missingback := int((from-cfrom)/minfo.Frequency), int((to-cto)/minfo.Frequency)\n\t\t\tif missingfront != 0 {\n\t\t\t\treturn ErrDataDoesNotAlignMissingFront\n\t\t\t}\n\n\t\t\tnewlen := len(cdata) - missingback\n\t\t\tif newlen < 1 {\n\t\t\t\treturn ErrDataDoesNotAlignMissingBack\n\t\t\t}\n\t\t\tcdata = cdata[0:newlen]\n\t\t\tif len(cdata) != len(data) {\n\t\t\t\treturn ErrDataDoesNotAlignDataLenMismatch\n\t\t\t}\n\n\t\t\tfrom, to = cfrom, cto\n\t\t}\n\n\t\tdata = cdata\n\t\tn += 1\n\t\treturn nil\n\t})\n\n\tif err != nil {\n\t\treturn nil, 0, 0, 0, err\n\t} else if n == 0 {\n\t\treturn nil, 0, 0, 0, ErrNoHostOrMetric\n\t} else if n > 1 {\n\t\tif minfo.Aggregation == AvgAggregation {\n\t\t\tnormalize := 1. / schema.Float(n)\n\t\t\tfor i := 0; i < len(data); i++ {\n\t\t\t\tdata[i] *= normalize\n\t\t\t}\n\t\t} else if minfo.Aggregation != SumAggregation {\n\t\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> invalid aggregation\")\n\t\t}\n\t}\n\n\tdata, resolution, err = resampler.LargestTriangleThreeBucket(data, minfo.Frequency, resolution)\n\tif err != nil {\n\t\treturn nil, 0, 0, 0, err\n\t}\n\n\treturn data, from, to, resolution, nil\n}\n\n// Free releases all buffers for the selected level and all its children that\n// contain only values older than `t`.\nfunc (m *MemoryStore) Free(selector []string, t int64) (int, error) {\n\treturn m.GetLevel(selector).free(t)\n}\n\n// ForceFree unconditionally removes the oldest buffer from each metric chain.\nfunc (m *MemoryStore) ForceFree() (int, error) {\n\treturn m.GetLevel(nil).forceFree()\n}\n\nfunc (m *MemoryStore) FreeAll() error {\n\tm.root.lock.Lock()\n\tdefer m.root.lock.Unlock()\n\n\tfor k := range m.root.children {\n\t\tdelete(m.root.children, k)\n\t}\n\n\treturn nil\n}\n\nfunc (m *MemoryStore) SizeInBytes() int64 {\n\treturn m.root.sizeInBytes()\n}\n\nfunc (m *MemoryStore) SizeInGB() float64 {\n\treturn float64(m.root.sizeInBytes()) / 1e9\n}\n\n// ListChildren , given a selector, returns a list of all children of the level\n// selected.\nfunc (m *MemoryStore) ListChildren(selector []string) []string {\n\tlvl := &m.root\n\tfor lvl != nil && len(selector) != 0 {\n\t\tlvl.lock.RLock()\n\t\tnext := lvl.children[selector[0]]\n\t\tlvl.lock.RUnlock()\n\t\tlvl = next\n\t\tselector = selector[1:]\n\t}\n\n\tif lvl == nil {\n\t\treturn nil\n\t}\n\n\tlvl.lock.RLock()\n\tdefer lvl.lock.RUnlock()\n\n\tchildren := make([]string, 0, len(lvl.children))\n\tfor child := range lvl.children {\n\t\tchildren = append(children, child)\n\t}\n\n\treturn children\n}\n","structuredPatch":[{"oldStart":170,"oldLines":7,"newStart":170,"newLines":7,"lines":[" ctx, shutdown := context.WithCancel(context.Background())"," "," Retention(wg, ctx)","- Checkpointing(wg, ctx)","+ Checkpointing(wg, ctx, restoreFrom)"," CleanUp(wg, ctx)"," WALStaging(wg, ctx)"," MemoryUsageTracker(wg, ctx)"]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"d0b3c648-c48a-4470-8a95-3e4531590fc0","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"bc54ba35-8b7f-4b5c-8501-cc18f19c84b5","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01Ld1UMBtWP7r7K9RtZbTZLW","type":"message","role":"assistant","content":[{"type":"text","text":"Now update the doc comment for `Checkpointing`:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":226,"cache_read_input_tokens":39041,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":226},"output_tokens":4,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4WioFnmhA93sLkEda8","type":"assistant","uuid":"edaa50f6-2868-4444-babb-7451ec37c3b0","timestamp":"2026-03-27T05:50:12.397Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"edaa50f6-2868-4444-babb-7451ec37c3b0","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01Ld1UMBtWP7r7K9RtZbTZLW","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01PM1nnhRMfAN84G5ASY1x6N","name":"Edit","input":{"replace_all":false,"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","old_string":"// Checkpointing starts a background worker that periodically saves metric data to disk.\n//\n// Checkpoints are written every 12 hours (hardcoded).\n//\n// Format behaviour:\n// - \"json\": Periodic checkpointing every checkpointInterval\n// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\nfunc Checkpointing(wg *sync.WaitGroup, ctx context.Context, restoreFrom time.Time) {","new_string":"// Checkpointing starts a background worker that periodically saves metric data to disk.\n//\n// restoreFrom is the earliest timestamp of data loaded from checkpoint files at startup.\n// The first periodic checkpoint after restart will cover [restoreFrom, now], ensuring that\n// loaded data is re-persisted before old checkpoint files are cleaned up.\n//\n// Format behaviour:\n// - \"json\": Periodic checkpointing every checkpointInterval\n// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\nfunc Checkpointing(wg *sync.WaitGroup, ctx context.Context, restoreFrom time.Time) {"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":226,"cache_read_input_tokens":39041,"output_tokens":403,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":226,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4WioFnmhA93sLkEda8","type":"assistant","uuid":"dbb97f2d-74ca-4aa9-b0ab-a29fee0b591a","timestamp":"2026-03-27T05:50:17.194Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"dbb97f2d-74ca-4aa9-b0ab-a29fee0b591a","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Edit","command":"callback"},"parentToolUseID":"toolu_01PM1nnhRMfAN84G5ASY1x6N","toolUseID":"toolu_01PM1nnhRMfAN84G5ASY1x6N","timestamp":"2026-03-27T05:50:17.218Z","uuid":"13f73758-718c-4077-8062-ddd91591e426","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"dbb97f2d-74ca-4aa9-b0ab-a29fee0b591a","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01PM1nnhRMfAN84G5ASY1x6N","type":"tool_result","content":"The file /Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go has been updated successfully."}]},"uuid":"13e37d4e-0522-4bba-b037-fec640a5a93e","timestamp":"2026-03-27T05:50:17.218Z","toolUseResult":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","oldString":"// Checkpointing starts a background worker that periodically saves metric data to disk.\n//\n// Checkpoints are written every 12 hours (hardcoded).\n//\n// Format behaviour:\n// - \"json\": Periodic checkpointing every checkpointInterval\n// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\nfunc Checkpointing(wg *sync.WaitGroup, ctx context.Context, restoreFrom time.Time) {","newString":"// Checkpointing starts a background worker that periodically saves metric data to disk.\n//\n// restoreFrom is the earliest timestamp of data loaded from checkpoint files at startup.\n// The first periodic checkpoint after restart will cover [restoreFrom, now], ensuring that\n// loaded data is re-persisted before old checkpoint files are cleaned up.\n//\n// Format behaviour:\n// - \"json\": Periodic checkpointing every checkpointInterval\n// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\nfunc Checkpointing(wg *sync.WaitGroup, ctx context.Context, restoreFrom time.Time) {","originalFile":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// This file implements checkpoint persistence for the in-memory metric store.\n//\n// Checkpoints enable graceful restarts by periodically saving in-memory metric\n// data to disk in JSON or binary format. The checkpoint system:\n//\n// Key Features:\n// - Periodic background checkpointing via the Checkpointing() worker\n// - Two format families: JSON (human-readable) and WAL+binary (compact, crash-safe)\n// - Parallel checkpoint creation and loading using worker pools\n// - Hierarchical file organization: checkpoint_dir/cluster/host/timestamp.{json|bin}\n// - WAL file: checkpoint_dir/cluster/host/current.wal (append-only, per-entry)\n// - Only saves unarchived data (archived data is already persisted elsewhere)\n// - GC optimization during loading to prevent excessive heap growth\n//\n// Checkpoint Workflow:\n// 1. Init() loads checkpoints within retention window at startup\n// 2. Checkpointing() worker periodically saves new data\n// 3. Shutdown() writes final checkpoint before exit\n//\n// File Organization:\n//\n//\tcheckpoints/\n//\t cluster1/\n//\t host001/\n//\t 1234567890.json (JSON format: full subtree snapshot)\n//\t 1234567890.bin (binary format: full subtree snapshot)\n//\t current.wal (WAL format: append-only per-entry log)\n//\t host002/\n//\t ...\npackage metricstore\n\nimport (\n\t\"bufio\"\n\t\"context\"\n\t\"encoding/json\"\n\t\"errors\"\n\t\"fmt\"\n\t\"io/fs\"\n\t\"os\"\n\t\"path\"\n\t\"path/filepath\"\n\t\"sort\"\n\t\"strconv\"\n\t\"strings\"\n\t\"sync\"\n\t\"sync/atomic\"\n\t\"time\"\n\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n)\n\nconst (\n\tCheckpointFilePerms = 0o644 // File permissions for checkpoint files\n\tCheckpointDirPerms = 0o755 // Directory permissions for checkpoint directories\n\tGCTriggerInterval = DefaultGCTriggerInterval // Interval for triggering GC during checkpoint loading\n)\n\n// CheckpointMetrics represents metric data in a checkpoint file.\n// Whenever the structure changes, update MarshalJSON as well!\ntype CheckpointMetrics struct {\n\tData []schema.Float `json:\"data\"`\n\tFrequency int64 `json:\"frequency\"`\n\tStart int64 `json:\"start\"`\n}\n\n// CheckpointFile represents the hierarchical structure of a checkpoint file.\n// It mirrors the Level tree structure from the MemoryStore.\ntype CheckpointFile struct {\n\tMetrics map[string]*CheckpointMetrics `json:\"metrics\"`\n\tChildren map[string]*CheckpointFile `json:\"children\"`\n\tFrom int64 `json:\"from\"`\n\tTo int64 `json:\"to\"`\n}\n\n// lastCheckpoint tracks the timestamp of the last checkpoint creation.\nvar (\n\tlastCheckpoint time.Time\n\tlastCheckpointMu sync.Mutex\n)\n\n// Checkpointing starts a background worker that periodically saves metric data to disk.\n//\n// Checkpoints are written every 12 hours (hardcoded).\n//\n// Format behaviour:\n// - \"json\": Periodic checkpointing every checkpointInterval\n// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\nfunc Checkpointing(wg *sync.WaitGroup, ctx context.Context, restoreFrom time.Time) {\n\tlastCheckpointMu.Lock()\n\tlastCheckpoint = restoreFrom\n\tlastCheckpointMu.Unlock()\n\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\n\t\td := 12 * time.Hour // default checkpoint interval\n\t\tif Keys.CheckpointInterval != \"\" {\n\t\t\tparsed, err := time.ParseDuration(Keys.CheckpointInterval)\n\t\t\tif err != nil {\n\t\t\t\tcclog.Errorf(\"[METRICSTORE]> invalid checkpoint-interval %q: %s, using default 12h\", Keys.CheckpointInterval, err)\n\t\t\t} else {\n\t\t\t\td = parsed\n\t\t\t}\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\tfrom := lastCheckpoint\n\t\t\t\tlastCheckpointMu.Unlock()\n\n\t\t\t\tnow := time.Now()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start checkpointing (starting at %s)...\", from.Format(time.RFC3339))\n\n\t\t\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\t\t\t\tn, hostDirs, err := ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> binary checkpointing failed: %s\", err.Error())\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d binary snapshot files created\", n)\n\t\t\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\t\t\tlastCheckpoint = now\n\t\t\t\t\t\tlastCheckpointMu.Unlock()\n\t\t\t\t\t\t// Rotate WAL files for successfully checkpointed hosts.\n\t\t\t\t\t\tRotateWALFiles(hostDirs)\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\tn, err := ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> checkpointing failed: %s\", err.Error())\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files created\", n)\n\t\t\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\t\t\tlastCheckpoint = now\n\t\t\t\t\t\tlastCheckpointMu.Unlock()\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}\n\n// MarshalJSON provides optimized JSON encoding for CheckpointMetrics.\n//\n// Since schema.Float has custom MarshalJSON, serializing []Float has significant overhead.\n// This method manually constructs JSON to avoid allocations and interface conversions.\nfunc (cm *CheckpointMetrics) MarshalJSON() ([]byte, error) {\n\tbuf := make([]byte, 0, 128+len(cm.Data)*8)\n\tbuf = append(buf, `{\"frequency\":`...)\n\tbuf = strconv.AppendInt(buf, cm.Frequency, 10)\n\tbuf = append(buf, `,\"start\":`...)\n\tbuf = strconv.AppendInt(buf, cm.Start, 10)\n\tbuf = append(buf, `,\"data\":[`...)\n\tfor i, x := range cm.Data {\n\t\tif i != 0 {\n\t\t\tbuf = append(buf, ',')\n\t\t}\n\t\tif x.IsNaN() {\n\t\t\tbuf = append(buf, `null`...)\n\t\t} else {\n\t\t\tbuf = strconv.AppendFloat(buf, float64(x), 'f', 1, 32)\n\t\t}\n\t}\n\tbuf = append(buf, `]}`...)\n\treturn buf, nil\n}\n\n// ToCheckpoint writes metric data to checkpoint files in parallel (JSON format).\n//\n// Metrics at root and cluster levels are skipped. One file per host is created.\n// Uses worker pool (Keys.NumWorkers) for parallel processing. Only locks one host\n// at a time, allowing concurrent writes/reads to other hosts.\n//\n// Returns the number of checkpoint files created and any errors encountered.\nfunc (m *MemoryStore) ToCheckpoint(dir string, from, to int64) (int, error) {\n\t// Pre-calculate capacity by counting cluster/host pairs\n\tm.root.lock.RLock()\n\ttotalHosts := 0\n\tfor _, l1 := range m.root.children {\n\t\tl1.lock.RLock()\n\t\ttotalHosts += len(l1.children)\n\t\tl1.lock.RUnlock()\n\t}\n\tm.root.lock.RUnlock()\n\n\tlevels := make([]*Level, 0, totalHosts)\n\tselectors := make([][]string, 0, totalHosts)\n\n\tm.root.lock.RLock()\n\tfor sel1, l1 := range m.root.children {\n\t\tl1.lock.RLock()\n\t\tfor sel2, l2 := range l1.children {\n\t\t\tlevels = append(levels, l2)\n\t\t\tselectors = append(selectors, []string{sel1, sel2})\n\t\t}\n\t\tl1.lock.RUnlock()\n\t}\n\tm.root.lock.RUnlock()\n\n\ttype workItem struct {\n\t\tlevel *Level\n\t\tdir string\n\t\tselector []string\n\t}\n\n\tn, errs := int32(0), int32(0)\n\n\tvar wg sync.WaitGroup\n\twg.Add(Keys.NumWorkers)\n\twork := make(chan workItem, Keys.NumWorkers*2)\n\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n\t\tgo func() {\n\t\t\tdefer wg.Done()\n\n\t\t\tfor workItem := range work {\n\t\t\t\tif err := workItem.level.toCheckpoint(workItem.dir, from, to, m); err != nil {\n\t\t\t\t\tif err == ErrNoNewArchiveData {\n\t\t\t\t\t\tcontinue\n\t\t\t\t\t}\n\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while checkpointing %#v: %s\", workItem.selector, err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t} else {\n\t\t\t\t\tatomic.AddInt32(&n, 1)\n\t\t\t\t}\n\t\t\t}\n\t\t}()\n\t}\n\n\tfor i := 0; i < len(levels); i++ {\n\t\tdir := path.Join(dir, path.Join(selectors[i]...))\n\t\twork <- workItem{\n\t\t\tlevel: levels[i],\n\t\t\tdir: dir,\n\t\t\tselector: selectors[i],\n\t\t}\n\t}\n\n\tclose(work)\n\twg.Wait()\n\n\tif errs > 0 {\n\t\treturn int(n), fmt.Errorf(\"[METRICSTORE]> %d errors happened while creating checkpoints (%d successes)\", errs, n)\n\t}\n\treturn int(n), nil\n}\n\n// toCheckpointFile recursively converts a Level tree to CheckpointFile structure.\n// Skips metrics that are already archived. Returns nil if no unarchived data exists.\nfunc (l *Level) toCheckpointFile(from, to int64, m *MemoryStore) (*CheckpointFile, error) {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tretval := &CheckpointFile{\n\t\tFrom: from,\n\t\tTo: to,\n\t\tMetrics: make(map[string]*CheckpointMetrics),\n\t\tChildren: make(map[string]*CheckpointFile),\n\t}\n\n\tfor metric, minfo := range m.Metrics {\n\t\tb := l.metrics[minfo.offset]\n\t\tif b == nil {\n\t\t\tcontinue\n\t\t}\n\n\t\tallArchived := true\n\t\tb.iterFromTo(from, to, func(b *buffer) error {\n\t\t\tif !b.archived {\n\t\t\t\tallArchived = false\n\t\t\t\treturn fmt.Errorf(\"stop\") // Early termination signal\n\t\t\t}\n\t\t\treturn nil\n\t\t})\n\n\t\tif allArchived {\n\t\t\tcontinue\n\t\t}\n\n\t\tdata := make([]schema.Float, (to-from)/b.frequency+1)\n\t\tdata, start, end, err := b.read(from, to, data)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\n\t\tfor i := int((end - start) / b.frequency); i < len(data); i++ {\n\t\t\tdata[i] = schema.NaN\n\t\t}\n\n\t\tretval.Metrics[metric] = &CheckpointMetrics{\n\t\t\tFrequency: b.frequency,\n\t\t\tStart: start,\n\t\t\tData: data,\n\t\t}\n\t}\n\n\tfor name, child := range l.children {\n\t\tval, err := child.toCheckpointFile(from, to, m)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\n\t\tif val != nil {\n\t\t\tretval.Children[name] = val\n\t\t}\n\t}\n\n\tif len(retval.Children) == 0 && len(retval.Metrics) == 0 {\n\t\treturn nil, nil\n\t}\n\n\treturn retval, nil\n}\n\n// toCheckpoint writes a Level's data to a JSON checkpoint file.\n// Creates directory if needed. Returns ErrNoNewArchiveData if nothing to save.\nfunc (l *Level) toCheckpoint(dir string, from, to int64, m *MemoryStore) error {\n\tcf, err := l.toCheckpointFile(from, to, m)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tif cf == nil {\n\t\treturn ErrNoNewArchiveData\n\t}\n\n\tfilepath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n\tf, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\tif err != nil && os.IsNotExist(err) {\n\t\terr = os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err == nil {\n\t\t\tf, err = os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\t\t}\n\t}\n\tif err != nil {\n\t\treturn err\n\t}\n\tdefer f.Close()\n\n\tbw := bufio.NewWriter(f)\n\tif err = json.NewEncoder(bw).Encode(cf); err != nil {\n\t\treturn err\n\t}\n\n\treturn bw.Flush()\n}\n\n// enqueueCheckpointHosts traverses checkpoint directory and enqueues cluster/host pairs.\n// Returns error if directory structure is invalid.\nfunc enqueueCheckpointHosts(dir string, work chan<- [2]string) error {\n\tclustersDir, err := os.ReadDir(dir)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tfor _, clusterDir := range clustersDir {\n\t\tif !clusterDir.IsDir() {\n\t\t\treturn errors.New(\"[METRICSTORE]> expected only directories at first level of checkpoints/ directory\")\n\t\t}\n\n\t\thostsDir, err := os.ReadDir(filepath.Join(dir, clusterDir.Name()))\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\tfor _, hostDir := range hostsDir {\n\t\t\tif !hostDir.IsDir() {\n\t\t\t\treturn errors.New(\"[METRICSTORE]> expected only directories at second level of checkpoints/ directory\")\n\t\t\t}\n\n\t\t\twork <- [2]string{clusterDir.Name(), hostDir.Name()}\n\t\t}\n\t}\n\n\treturn nil\n}\n\n// FromCheckpoint loads checkpoint files from disk into memory in parallel.\n//\n// Uses worker pool to load cluster/host combinations. Returns number of files\n// loaded and any errors.\nfunc (m *MemoryStore) FromCheckpoint(dir string, from int64) (int, error) {\n\tvar wg sync.WaitGroup\n\twork := make(chan [2]string, Keys.NumWorkers*4)\n\tn, errs := int32(0), int32(0)\n\n\twg.Add(Keys.NumWorkers)\n\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n\t\tgo func() {\n\t\t\tdefer wg.Done()\n\t\t\tfor host := range work {\n\t\t\t\tlvl := m.root.findLevelOrCreate(host[:], len(m.Metrics))\n\t\t\t\tnn, err := lvl.fromCheckpoint(m, filepath.Join(dir, host[0], host[1]), from)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while loading checkpoints for %s/%s: %s\", host[0], host[1], err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t}\n\t\t\t\tatomic.AddInt32(&n, int32(nn))\n\t\t\t}\n\t\t}()\n\t}\n\n\terr := enqueueCheckpointHosts(dir, work)\n\tclose(work)\n\twg.Wait()\n\n\tif err != nil {\n\t\treturn int(n), err\n\t}\n\n\tif errs > 0 {\n\t\treturn int(n), fmt.Errorf(\"[METRICSTORE]> %d errors happened while creating checkpoints (%d successes)\", errs, n)\n\t}\n\treturn int(n), nil\n}\n\n// FromCheckpointFiles is the main entry point for loading checkpoints at startup.\n//\n// Creates checkpoint directory if it doesn't exist. This function must be called\n// before any writes or reads, and can only be called once.\nfunc (m *MemoryStore) FromCheckpointFiles(dir string, from int64) (int, error) {\n\tif _, err := os.Stat(dir); os.IsNotExist(err) {\n\t\terr := os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err != nil {\n\t\t\tcclog.Fatalf(\"[METRICSTORE]> Error creating directory: %#v\\n\", err)\n\t\t}\n\t\tcclog.Debugf(\"[METRICSTORE]> %#v Directory created successfully\", dir)\n\t}\n\n\treturn m.FromCheckpoint(dir, from)\n}\n\nfunc (l *Level) loadJSONFile(m *MemoryStore, f *os.File, from int64) error {\n\tbr := bufio.NewReader(f)\n\tcf := &CheckpointFile{}\n\tif err := json.NewDecoder(br).Decode(cf); err != nil {\n\t\treturn err\n\t}\n\n\tif cf.To != 0 && cf.To < from {\n\t\treturn nil\n\t}\n\n\tif err := l.loadFile(cf, m); err != nil {\n\t\treturn err\n\t}\n\n\treturn nil\n}\n\nfunc (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {\n\tfor name, metric := range cf.Metrics {\n\t\tn := len(metric.Data)\n\t\tb := &buffer{\n\t\t\tfrequency: metric.Frequency,\n\t\t\tstart: metric.Start,\n\t\t\tdata: metric.Data[0:n:n],\n\t\t\tprev: nil,\n\t\t\tnext: nil,\n\t\t\tarchived: false,\n\t\t}\n\n\t\tminfo, ok := m.Metrics[name]\n\t\tif !ok {\n\t\t\tcontinue\n\t\t}\n\n\t\tprev := l.metrics[minfo.offset]\n\t\tif prev == nil {\n\t\t\tl.metrics[minfo.offset] = b\n\t\t} else {\n\t\t\tif prev.start > b.start {\n\t\t\t\treturn fmt.Errorf(\"[METRICSTORE]> buffer start time %d is before previous buffer start %d\", b.start, prev.start)\n\t\t\t}\n\n\t\t\tb.prev = prev\n\t\t\tprev.next = b\n\t\t}\n\t\tl.metrics[minfo.offset] = b\n\t}\n\n\tif len(cf.Children) > 0 && l.children == nil {\n\t\tl.children = make(map[string]*Level)\n\t}\n\n\tfor sel, childCf := range cf.Children {\n\t\tchild, ok := l.children[sel]\n\t\tif !ok {\n\t\t\tchild = &Level{\n\t\t\t\tmetrics: make([]*buffer, len(m.Metrics)),\n\t\t\t\tchildren: nil,\n\t\t\t}\n\t\t\tl.children[sel] = child\n\t\t}\n\n\t\tif err := child.loadFile(childCf, m); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\n\treturn nil\n}\n\n// fromCheckpoint loads all checkpoint files (JSON, binary snapshot, WAL) for a\n// single host directory. Snapshot files are loaded first (sorted by timestamp),\n// then current.wal is replayed on top.\nfunc (l *Level) fromCheckpoint(m *MemoryStore, dir string, from int64) (int, error) {\n\tdirentries, err := os.ReadDir(dir)\n\tif err != nil {\n\t\tif os.IsNotExist(err) {\n\t\t\treturn 0, nil\n\t\t}\n\t\treturn 0, err\n\t}\n\n\tallFiles := make([]fs.DirEntry, 0)\n\tvar walEntry fs.DirEntry\n\tfilesLoaded := 0\n\n\tfor _, e := range direntries {\n\t\tif e.IsDir() {\n\t\t\t// Legacy: skip subdirectories (only used by old Avro format).\n\t\t\t// These are ignored; their data is not loaded.\n\t\t\tcclog.Debugf(\"[METRICSTORE]> skipping subdirectory %s in checkpoint dir %s\", e.Name(), dir)\n\t\t\tcontinue\n\t\t}\n\n\t\tname := e.Name()\n\t\tif strings.HasSuffix(name, \".json\") || strings.HasSuffix(name, \".bin\") {\n\t\t\tallFiles = append(allFiles, e)\n\t\t} else if name == \"current.wal\" {\n\t\t\twalEntry = e\n\t\t}\n\t\t// Silently ignore other files (e.g., .tmp, .bin.tmp from interrupted writes).\n\t}\n\n\tfiles, err := findFiles(allFiles, from, true)\n\tif err != nil {\n\t\treturn filesLoaded, err\n\t}\n\n\tloaders := map[string]func(*MemoryStore, *os.File, int64) error{\n\t\t\".json\": l.loadJSONFile,\n\t\t\".bin\": l.loadBinaryFile,\n\t}\n\n\tfor _, filename := range files {\n\t\text := filepath.Ext(filename)\n\t\tloader := loaders[ext]\n\t\tif loader == nil {\n\t\t\tcclog.Warnf(\"[METRICSTORE]> unknown extension for checkpoint file %s\", filename)\n\t\t\tcontinue\n\t\t}\n\n\t\terr := func() error {\n\t\t\tf, err := os.Open(path.Join(dir, filename))\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\tdefer f.Close()\n\t\t\treturn loader(m, f, from)\n\t\t}()\n\t\tif err != nil {\n\t\t\treturn filesLoaded, err\n\t\t}\n\t\tfilesLoaded++\n\t}\n\n\t// Replay WAL after all snapshot files so it fills in data since the last snapshot.\n\tif walEntry != nil {\n\t\terr := func() error {\n\t\t\tf, err := os.Open(path.Join(dir, walEntry.Name()))\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\tdefer f.Close()\n\t\t\treturn l.loadWALFile(m, f, from)\n\t\t}()\n\t\tif err != nil {\n\t\t\t// WAL errors are non-fatal: the snapshot already loaded the bulk of data.\n\t\t\tcclog.Warnf(\"[METRICSTORE]> WAL replay error for %s: %v (data since last snapshot may be missing)\", dir, err)\n\t\t} else {\n\t\t\tfilesLoaded++\n\t\t}\n\t}\n\n\treturn filesLoaded, nil\n}\n\n// parseTimestampFromFilename extracts a Unix timestamp from a checkpoint filename.\n// Supports \".json\" (format: \".json\") and \".bin\" (format: \".bin\").\nfunc parseTimestampFromFilename(name string) (int64, error) {\n\tswitch {\n\tcase strings.HasSuffix(name, \".json\"):\n\t\treturn strconv.ParseInt(name[:len(name)-5], 10, 64)\n\tcase strings.HasSuffix(name, \".bin\"):\n\t\treturn strconv.ParseInt(name[:len(name)-4], 10, 64)\n\tdefault:\n\t\treturn 0, fmt.Errorf(\"unknown checkpoint extension for file %q\", name)\n\t}\n}\n\n// findFiles returns filenames from direntries whose timestamps satisfy the filter.\n// If findMoreRecentFiles is true, returns files with timestamps >= t (plus the\n// last file before t if t falls between two files).\nfunc findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {\n\tnums := map[string]int64{}\n\tfor _, e := range direntries {\n\t\tname := e.Name()\n\t\tif !strings.HasSuffix(name, \".json\") && !strings.HasSuffix(name, \".bin\") {\n\t\t\tcontinue\n\t\t}\n\n\t\tts, err := parseTimestampFromFilename(name)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\t\tnums[name] = ts\n\t}\n\n\tsort.Slice(direntries, func(i, j int) bool {\n\t\ta, b := direntries[i], direntries[j]\n\t\treturn nums[a.Name()] < nums[b.Name()]\n\t})\n\n\tif len(nums) == 0 {\n\t\treturn nil, nil\n\t}\n\n\tfilenames := make([]string, 0)\n\n\tfor i, e := range direntries {\n\t\tts1 := nums[e.Name()]\n\n\t\tif findMoreRecentFiles && t <= ts1 {\n\t\t\tfilenames = append(filenames, e.Name())\n\t\t} else if !findMoreRecentFiles && ts1 <= t && ts1 != 0 {\n\t\t\tfilenames = append(filenames, e.Name())\n\t\t}\n\n\t\tif i == len(direntries)-1 {\n\t\t\tcontinue\n\t\t}\n\n\t\tenext := direntries[i+1]\n\t\tts2 := nums[enext.Name()]\n\n\t\tif findMoreRecentFiles {\n\t\t\tif ts1 < t && t < ts2 {\n\t\t\t\tfilenames = append(filenames, e.Name())\n\t\t\t}\n\t\t}\n\t}\n\n\treturn filenames, nil\n}\n","structuredPatch":[{"oldStart":86,"oldLines":7,"newStart":86,"newLines":9,"lines":[" "," // Checkpointing starts a background worker that periodically saves metric data to disk."," //","-// Checkpoints are written every 12 hours (hardcoded).","+// restoreFrom is the earliest timestamp of data loaded from checkpoint files at startup.","+// The first periodic checkpoint after restart will cover [restoreFrom, now], ensuring that","+// loaded data is re-persisted before old checkpoint files are cleaned up."," //"," // Format behaviour:"," // - \"json\": Periodic checkpointing every checkpointInterval"]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"dbb97f2d-74ca-4aa9-b0ab-a29fee0b591a","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"13e37d4e-0522-4bba-b037-fec640a5a93e","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01WpFwd5Kk7cBd4kXjSN7GEG","type":"message","role":"assistant","content":[{"type":"text","text":"## Fix 3: JSON format atomic writes (temp + rename)"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":441,"cache_read_input_tokens":39267,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":441},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4XFsHrhc6PPQbLesgH","type":"assistant","uuid":"eb18e5fd-329d-4876-8e0d-406e5d0e485e","timestamp":"2026-03-27T05:50:20.460Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"eb18e5fd-329d-4876-8e0d-406e5d0e485e","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01WpFwd5Kk7cBd4kXjSN7GEG","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01GsPJTxQ4DDSQzvxcJHxQD4","name":"Edit","input":{"replace_all":false,"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","old_string":"\tfilepath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n\tf, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\tif err != nil && os.IsNotExist(err) {\n\t\terr = os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err == nil {\n\t\t\tf, err = os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\t\t}\n\t}\n\tif err != nil {\n\t\treturn err\n\t}\n\tdefer f.Close()\n\n\tbw := bufio.NewWriter(f)\n\tif err = json.NewEncoder(bw).Encode(cf); err != nil {\n\t\treturn err\n\t}\n\n\treturn bw.Flush()","new_string":"\tfinalPath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n\ttmpPath := finalPath + \".tmp\"\n\n\tf, err := os.OpenFile(tmpPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\tif err != nil && os.IsNotExist(err) {\n\t\terr = os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err == nil {\n\t\t\tf, err = os.OpenFile(tmpPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\t\t}\n\t}\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tbw := bufio.NewWriter(f)\n\tif err = json.NewEncoder(bw).Encode(cf); err != nil {\n\t\tf.Close()\n\t\tos.Remove(tmpPath)\n\t\treturn err\n\t}\n\n\tif err = bw.Flush(); err != nil {\n\t\tf.Close()\n\t\tos.Remove(tmpPath)\n\t\treturn err\n\t}\n\tf.Close()\n\n\treturn os.Rename(tmpPath, finalPath)"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":441,"cache_read_input_tokens":39267,"output_tokens":667,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":441,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4XFsHrhc6PPQbLesgH","type":"assistant","uuid":"a4926b20-3b5d-489c-aded-95da8c449e35","timestamp":"2026-03-27T05:50:24.961Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"a4926b20-3b5d-489c-aded-95da8c449e35","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Edit","command":"callback"},"parentToolUseID":"toolu_01GsPJTxQ4DDSQzvxcJHxQD4","toolUseID":"toolu_01GsPJTxQ4DDSQzvxcJHxQD4","timestamp":"2026-03-27T05:50:24.990Z","uuid":"d2c6fe10-b20b-45f9-9f5f-a999390a5bf7","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"a4926b20-3b5d-489c-aded-95da8c449e35","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01GsPJTxQ4DDSQzvxcJHxQD4","type":"tool_result","content":"The file /Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go has been updated successfully."}]},"uuid":"1f2ca6db-854e-4427-8cad-9e8dfd91673f","timestamp":"2026-03-27T05:50:24.990Z","toolUseResult":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/checkpoint.go","oldString":"\tfilepath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n\tf, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\tif err != nil && os.IsNotExist(err) {\n\t\terr = os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err == nil {\n\t\t\tf, err = os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\t\t}\n\t}\n\tif err != nil {\n\t\treturn err\n\t}\n\tdefer f.Close()\n\n\tbw := bufio.NewWriter(f)\n\tif err = json.NewEncoder(bw).Encode(cf); err != nil {\n\t\treturn err\n\t}\n\n\treturn bw.Flush()","newString":"\tfinalPath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n\ttmpPath := finalPath + \".tmp\"\n\n\tf, err := os.OpenFile(tmpPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\tif err != nil && os.IsNotExist(err) {\n\t\terr = os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err == nil {\n\t\t\tf, err = os.OpenFile(tmpPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\t\t}\n\t}\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tbw := bufio.NewWriter(f)\n\tif err = json.NewEncoder(bw).Encode(cf); err != nil {\n\t\tf.Close()\n\t\tos.Remove(tmpPath)\n\t\treturn err\n\t}\n\n\tif err = bw.Flush(); err != nil {\n\t\tf.Close()\n\t\tos.Remove(tmpPath)\n\t\treturn err\n\t}\n\tf.Close()\n\n\treturn os.Rename(tmpPath, finalPath)","originalFile":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// This file implements checkpoint persistence for the in-memory metric store.\n//\n// Checkpoints enable graceful restarts by periodically saving in-memory metric\n// data to disk in JSON or binary format. The checkpoint system:\n//\n// Key Features:\n// - Periodic background checkpointing via the Checkpointing() worker\n// - Two format families: JSON (human-readable) and WAL+binary (compact, crash-safe)\n// - Parallel checkpoint creation and loading using worker pools\n// - Hierarchical file organization: checkpoint_dir/cluster/host/timestamp.{json|bin}\n// - WAL file: checkpoint_dir/cluster/host/current.wal (append-only, per-entry)\n// - Only saves unarchived data (archived data is already persisted elsewhere)\n// - GC optimization during loading to prevent excessive heap growth\n//\n// Checkpoint Workflow:\n// 1. Init() loads checkpoints within retention window at startup\n// 2. Checkpointing() worker periodically saves new data\n// 3. Shutdown() writes final checkpoint before exit\n//\n// File Organization:\n//\n//\tcheckpoints/\n//\t cluster1/\n//\t host001/\n//\t 1234567890.json (JSON format: full subtree snapshot)\n//\t 1234567890.bin (binary format: full subtree snapshot)\n//\t current.wal (WAL format: append-only per-entry log)\n//\t host002/\n//\t ...\npackage metricstore\n\nimport (\n\t\"bufio\"\n\t\"context\"\n\t\"encoding/json\"\n\t\"errors\"\n\t\"fmt\"\n\t\"io/fs\"\n\t\"os\"\n\t\"path\"\n\t\"path/filepath\"\n\t\"sort\"\n\t\"strconv\"\n\t\"strings\"\n\t\"sync\"\n\t\"sync/atomic\"\n\t\"time\"\n\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n)\n\nconst (\n\tCheckpointFilePerms = 0o644 // File permissions for checkpoint files\n\tCheckpointDirPerms = 0o755 // Directory permissions for checkpoint directories\n\tGCTriggerInterval = DefaultGCTriggerInterval // Interval for triggering GC during checkpoint loading\n)\n\n// CheckpointMetrics represents metric data in a checkpoint file.\n// Whenever the structure changes, update MarshalJSON as well!\ntype CheckpointMetrics struct {\n\tData []schema.Float `json:\"data\"`\n\tFrequency int64 `json:\"frequency\"`\n\tStart int64 `json:\"start\"`\n}\n\n// CheckpointFile represents the hierarchical structure of a checkpoint file.\n// It mirrors the Level tree structure from the MemoryStore.\ntype CheckpointFile struct {\n\tMetrics map[string]*CheckpointMetrics `json:\"metrics\"`\n\tChildren map[string]*CheckpointFile `json:\"children\"`\n\tFrom int64 `json:\"from\"`\n\tTo int64 `json:\"to\"`\n}\n\n// lastCheckpoint tracks the timestamp of the last checkpoint creation.\nvar (\n\tlastCheckpoint time.Time\n\tlastCheckpointMu sync.Mutex\n)\n\n// Checkpointing starts a background worker that periodically saves metric data to disk.\n//\n// restoreFrom is the earliest timestamp of data loaded from checkpoint files at startup.\n// The first periodic checkpoint after restart will cover [restoreFrom, now], ensuring that\n// loaded data is re-persisted before old checkpoint files are cleaned up.\n//\n// Format behaviour:\n// - \"json\": Periodic checkpointing every checkpointInterval\n// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\nfunc Checkpointing(wg *sync.WaitGroup, ctx context.Context, restoreFrom time.Time) {\n\tlastCheckpointMu.Lock()\n\tlastCheckpoint = restoreFrom\n\tlastCheckpointMu.Unlock()\n\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\n\t\td := 12 * time.Hour // default checkpoint interval\n\t\tif Keys.CheckpointInterval != \"\" {\n\t\t\tparsed, err := time.ParseDuration(Keys.CheckpointInterval)\n\t\t\tif err != nil {\n\t\t\t\tcclog.Errorf(\"[METRICSTORE]> invalid checkpoint-interval %q: %s, using default 12h\", Keys.CheckpointInterval, err)\n\t\t\t} else {\n\t\t\t\td = parsed\n\t\t\t}\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\tfrom := lastCheckpoint\n\t\t\t\tlastCheckpointMu.Unlock()\n\n\t\t\t\tnow := time.Now()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start checkpointing (starting at %s)...\", from.Format(time.RFC3339))\n\n\t\t\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\t\t\t\tn, hostDirs, err := ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> binary checkpointing failed: %s\", err.Error())\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d binary snapshot files created\", n)\n\t\t\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\t\t\tlastCheckpoint = now\n\t\t\t\t\t\tlastCheckpointMu.Unlock()\n\t\t\t\t\t\t// Rotate WAL files for successfully checkpointed hosts.\n\t\t\t\t\t\tRotateWALFiles(hostDirs)\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\tn, err := ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> checkpointing failed: %s\", err.Error())\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files created\", n)\n\t\t\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\t\t\tlastCheckpoint = now\n\t\t\t\t\t\tlastCheckpointMu.Unlock()\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}\n\n// MarshalJSON provides optimized JSON encoding for CheckpointMetrics.\n//\n// Since schema.Float has custom MarshalJSON, serializing []Float has significant overhead.\n// This method manually constructs JSON to avoid allocations and interface conversions.\nfunc (cm *CheckpointMetrics) MarshalJSON() ([]byte, error) {\n\tbuf := make([]byte, 0, 128+len(cm.Data)*8)\n\tbuf = append(buf, `{\"frequency\":`...)\n\tbuf = strconv.AppendInt(buf, cm.Frequency, 10)\n\tbuf = append(buf, `,\"start\":`...)\n\tbuf = strconv.AppendInt(buf, cm.Start, 10)\n\tbuf = append(buf, `,\"data\":[`...)\n\tfor i, x := range cm.Data {\n\t\tif i != 0 {\n\t\t\tbuf = append(buf, ',')\n\t\t}\n\t\tif x.IsNaN() {\n\t\t\tbuf = append(buf, `null`...)\n\t\t} else {\n\t\t\tbuf = strconv.AppendFloat(buf, float64(x), 'f', 1, 32)\n\t\t}\n\t}\n\tbuf = append(buf, `]}`...)\n\treturn buf, nil\n}\n\n// ToCheckpoint writes metric data to checkpoint files in parallel (JSON format).\n//\n// Metrics at root and cluster levels are skipped. One file per host is created.\n// Uses worker pool (Keys.NumWorkers) for parallel processing. Only locks one host\n// at a time, allowing concurrent writes/reads to other hosts.\n//\n// Returns the number of checkpoint files created and any errors encountered.\nfunc (m *MemoryStore) ToCheckpoint(dir string, from, to int64) (int, error) {\n\t// Pre-calculate capacity by counting cluster/host pairs\n\tm.root.lock.RLock()\n\ttotalHosts := 0\n\tfor _, l1 := range m.root.children {\n\t\tl1.lock.RLock()\n\t\ttotalHosts += len(l1.children)\n\t\tl1.lock.RUnlock()\n\t}\n\tm.root.lock.RUnlock()\n\n\tlevels := make([]*Level, 0, totalHosts)\n\tselectors := make([][]string, 0, totalHosts)\n\n\tm.root.lock.RLock()\n\tfor sel1, l1 := range m.root.children {\n\t\tl1.lock.RLock()\n\t\tfor sel2, l2 := range l1.children {\n\t\t\tlevels = append(levels, l2)\n\t\t\tselectors = append(selectors, []string{sel1, sel2})\n\t\t}\n\t\tl1.lock.RUnlock()\n\t}\n\tm.root.lock.RUnlock()\n\n\ttype workItem struct {\n\t\tlevel *Level\n\t\tdir string\n\t\tselector []string\n\t}\n\n\tn, errs := int32(0), int32(0)\n\n\tvar wg sync.WaitGroup\n\twg.Add(Keys.NumWorkers)\n\twork := make(chan workItem, Keys.NumWorkers*2)\n\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n\t\tgo func() {\n\t\t\tdefer wg.Done()\n\n\t\t\tfor workItem := range work {\n\t\t\t\tif err := workItem.level.toCheckpoint(workItem.dir, from, to, m); err != nil {\n\t\t\t\t\tif err == ErrNoNewArchiveData {\n\t\t\t\t\t\tcontinue\n\t\t\t\t\t}\n\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while checkpointing %#v: %s\", workItem.selector, err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t} else {\n\t\t\t\t\tatomic.AddInt32(&n, 1)\n\t\t\t\t}\n\t\t\t}\n\t\t}()\n\t}\n\n\tfor i := 0; i < len(levels); i++ {\n\t\tdir := path.Join(dir, path.Join(selectors[i]...))\n\t\twork <- workItem{\n\t\t\tlevel: levels[i],\n\t\t\tdir: dir,\n\t\t\tselector: selectors[i],\n\t\t}\n\t}\n\n\tclose(work)\n\twg.Wait()\n\n\tif errs > 0 {\n\t\treturn int(n), fmt.Errorf(\"[METRICSTORE]> %d errors happened while creating checkpoints (%d successes)\", errs, n)\n\t}\n\treturn int(n), nil\n}\n\n// toCheckpointFile recursively converts a Level tree to CheckpointFile structure.\n// Skips metrics that are already archived. Returns nil if no unarchived data exists.\nfunc (l *Level) toCheckpointFile(from, to int64, m *MemoryStore) (*CheckpointFile, error) {\n\tl.lock.RLock()\n\tdefer l.lock.RUnlock()\n\n\tretval := &CheckpointFile{\n\t\tFrom: from,\n\t\tTo: to,\n\t\tMetrics: make(map[string]*CheckpointMetrics),\n\t\tChildren: make(map[string]*CheckpointFile),\n\t}\n\n\tfor metric, minfo := range m.Metrics {\n\t\tb := l.metrics[minfo.offset]\n\t\tif b == nil {\n\t\t\tcontinue\n\t\t}\n\n\t\tallArchived := true\n\t\tb.iterFromTo(from, to, func(b *buffer) error {\n\t\t\tif !b.archived {\n\t\t\t\tallArchived = false\n\t\t\t\treturn fmt.Errorf(\"stop\") // Early termination signal\n\t\t\t}\n\t\t\treturn nil\n\t\t})\n\n\t\tif allArchived {\n\t\t\tcontinue\n\t\t}\n\n\t\tdata := make([]schema.Float, (to-from)/b.frequency+1)\n\t\tdata, start, end, err := b.read(from, to, data)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\n\t\tfor i := int((end - start) / b.frequency); i < len(data); i++ {\n\t\t\tdata[i] = schema.NaN\n\t\t}\n\n\t\tretval.Metrics[metric] = &CheckpointMetrics{\n\t\t\tFrequency: b.frequency,\n\t\t\tStart: start,\n\t\t\tData: data,\n\t\t}\n\t}\n\n\tfor name, child := range l.children {\n\t\tval, err := child.toCheckpointFile(from, to, m)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\n\t\tif val != nil {\n\t\t\tretval.Children[name] = val\n\t\t}\n\t}\n\n\tif len(retval.Children) == 0 && len(retval.Metrics) == 0 {\n\t\treturn nil, nil\n\t}\n\n\treturn retval, nil\n}\n\n// toCheckpoint writes a Level's data to a JSON checkpoint file.\n// Creates directory if needed. Returns ErrNoNewArchiveData if nothing to save.\nfunc (l *Level) toCheckpoint(dir string, from, to int64, m *MemoryStore) error {\n\tcf, err := l.toCheckpointFile(from, to, m)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tif cf == nil {\n\t\treturn ErrNoNewArchiveData\n\t}\n\n\tfilepath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n\tf, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\tif err != nil && os.IsNotExist(err) {\n\t\terr = os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err == nil {\n\t\t\tf, err = os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n\t\t}\n\t}\n\tif err != nil {\n\t\treturn err\n\t}\n\tdefer f.Close()\n\n\tbw := bufio.NewWriter(f)\n\tif err = json.NewEncoder(bw).Encode(cf); err != nil {\n\t\treturn err\n\t}\n\n\treturn bw.Flush()\n}\n\n// enqueueCheckpointHosts traverses checkpoint directory and enqueues cluster/host pairs.\n// Returns error if directory structure is invalid.\nfunc enqueueCheckpointHosts(dir string, work chan<- [2]string) error {\n\tclustersDir, err := os.ReadDir(dir)\n\tif err != nil {\n\t\treturn err\n\t}\n\n\tfor _, clusterDir := range clustersDir {\n\t\tif !clusterDir.IsDir() {\n\t\t\treturn errors.New(\"[METRICSTORE]> expected only directories at first level of checkpoints/ directory\")\n\t\t}\n\n\t\thostsDir, err := os.ReadDir(filepath.Join(dir, clusterDir.Name()))\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\n\t\tfor _, hostDir := range hostsDir {\n\t\t\tif !hostDir.IsDir() {\n\t\t\t\treturn errors.New(\"[METRICSTORE]> expected only directories at second level of checkpoints/ directory\")\n\t\t\t}\n\n\t\t\twork <- [2]string{clusterDir.Name(), hostDir.Name()}\n\t\t}\n\t}\n\n\treturn nil\n}\n\n// FromCheckpoint loads checkpoint files from disk into memory in parallel.\n//\n// Uses worker pool to load cluster/host combinations. Returns number of files\n// loaded and any errors.\nfunc (m *MemoryStore) FromCheckpoint(dir string, from int64) (int, error) {\n\tvar wg sync.WaitGroup\n\twork := make(chan [2]string, Keys.NumWorkers*4)\n\tn, errs := int32(0), int32(0)\n\n\twg.Add(Keys.NumWorkers)\n\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n\t\tgo func() {\n\t\t\tdefer wg.Done()\n\t\t\tfor host := range work {\n\t\t\t\tlvl := m.root.findLevelOrCreate(host[:], len(m.Metrics))\n\t\t\t\tnn, err := lvl.fromCheckpoint(m, filepath.Join(dir, host[0], host[1]), from)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while loading checkpoints for %s/%s: %s\", host[0], host[1], err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t}\n\t\t\t\tatomic.AddInt32(&n, int32(nn))\n\t\t\t}\n\t\t}()\n\t}\n\n\terr := enqueueCheckpointHosts(dir, work)\n\tclose(work)\n\twg.Wait()\n\n\tif err != nil {\n\t\treturn int(n), err\n\t}\n\n\tif errs > 0 {\n\t\treturn int(n), fmt.Errorf(\"[METRICSTORE]> %d errors happened while creating checkpoints (%d successes)\", errs, n)\n\t}\n\treturn int(n), nil\n}\n\n// FromCheckpointFiles is the main entry point for loading checkpoints at startup.\n//\n// Creates checkpoint directory if it doesn't exist. This function must be called\n// before any writes or reads, and can only be called once.\nfunc (m *MemoryStore) FromCheckpointFiles(dir string, from int64) (int, error) {\n\tif _, err := os.Stat(dir); os.IsNotExist(err) {\n\t\terr := os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err != nil {\n\t\t\tcclog.Fatalf(\"[METRICSTORE]> Error creating directory: %#v\\n\", err)\n\t\t}\n\t\tcclog.Debugf(\"[METRICSTORE]> %#v Directory created successfully\", dir)\n\t}\n\n\treturn m.FromCheckpoint(dir, from)\n}\n\nfunc (l *Level) loadJSONFile(m *MemoryStore, f *os.File, from int64) error {\n\tbr := bufio.NewReader(f)\n\tcf := &CheckpointFile{}\n\tif err := json.NewDecoder(br).Decode(cf); err != nil {\n\t\treturn err\n\t}\n\n\tif cf.To != 0 && cf.To < from {\n\t\treturn nil\n\t}\n\n\tif err := l.loadFile(cf, m); err != nil {\n\t\treturn err\n\t}\n\n\treturn nil\n}\n\nfunc (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {\n\tfor name, metric := range cf.Metrics {\n\t\tn := len(metric.Data)\n\t\tb := &buffer{\n\t\t\tfrequency: metric.Frequency,\n\t\t\tstart: metric.Start,\n\t\t\tdata: metric.Data[0:n:n],\n\t\t\tprev: nil,\n\t\t\tnext: nil,\n\t\t\tarchived: false,\n\t\t}\n\n\t\tminfo, ok := m.Metrics[name]\n\t\tif !ok {\n\t\t\tcontinue\n\t\t}\n\n\t\tprev := l.metrics[minfo.offset]\n\t\tif prev == nil {\n\t\t\tl.metrics[minfo.offset] = b\n\t\t} else {\n\t\t\tif prev.start > b.start {\n\t\t\t\treturn fmt.Errorf(\"[METRICSTORE]> buffer start time %d is before previous buffer start %d\", b.start, prev.start)\n\t\t\t}\n\n\t\t\tb.prev = prev\n\t\t\tprev.next = b\n\t\t}\n\t\tl.metrics[minfo.offset] = b\n\t}\n\n\tif len(cf.Children) > 0 && l.children == nil {\n\t\tl.children = make(map[string]*Level)\n\t}\n\n\tfor sel, childCf := range cf.Children {\n\t\tchild, ok := l.children[sel]\n\t\tif !ok {\n\t\t\tchild = &Level{\n\t\t\t\tmetrics: make([]*buffer, len(m.Metrics)),\n\t\t\t\tchildren: nil,\n\t\t\t}\n\t\t\tl.children[sel] = child\n\t\t}\n\n\t\tif err := child.loadFile(childCf, m); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\n\treturn nil\n}\n\n// fromCheckpoint loads all checkpoint files (JSON, binary snapshot, WAL) for a\n// single host directory. Snapshot files are loaded first (sorted by timestamp),\n// then current.wal is replayed on top.\nfunc (l *Level) fromCheckpoint(m *MemoryStore, dir string, from int64) (int, error) {\n\tdirentries, err := os.ReadDir(dir)\n\tif err != nil {\n\t\tif os.IsNotExist(err) {\n\t\t\treturn 0, nil\n\t\t}\n\t\treturn 0, err\n\t}\n\n\tallFiles := make([]fs.DirEntry, 0)\n\tvar walEntry fs.DirEntry\n\tfilesLoaded := 0\n\n\tfor _, e := range direntries {\n\t\tif e.IsDir() {\n\t\t\t// Legacy: skip subdirectories (only used by old Avro format).\n\t\t\t// These are ignored; their data is not loaded.\n\t\t\tcclog.Debugf(\"[METRICSTORE]> skipping subdirectory %s in checkpoint dir %s\", e.Name(), dir)\n\t\t\tcontinue\n\t\t}\n\n\t\tname := e.Name()\n\t\tif strings.HasSuffix(name, \".json\") || strings.HasSuffix(name, \".bin\") {\n\t\t\tallFiles = append(allFiles, e)\n\t\t} else if name == \"current.wal\" {\n\t\t\twalEntry = e\n\t\t}\n\t\t// Silently ignore other files (e.g., .tmp, .bin.tmp from interrupted writes).\n\t}\n\n\tfiles, err := findFiles(allFiles, from, true)\n\tif err != nil {\n\t\treturn filesLoaded, err\n\t}\n\n\tloaders := map[string]func(*MemoryStore, *os.File, int64) error{\n\t\t\".json\": l.loadJSONFile,\n\t\t\".bin\": l.loadBinaryFile,\n\t}\n\n\tfor _, filename := range files {\n\t\text := filepath.Ext(filename)\n\t\tloader := loaders[ext]\n\t\tif loader == nil {\n\t\t\tcclog.Warnf(\"[METRICSTORE]> unknown extension for checkpoint file %s\", filename)\n\t\t\tcontinue\n\t\t}\n\n\t\terr := func() error {\n\t\t\tf, err := os.Open(path.Join(dir, filename))\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\tdefer f.Close()\n\t\t\treturn loader(m, f, from)\n\t\t}()\n\t\tif err != nil {\n\t\t\treturn filesLoaded, err\n\t\t}\n\t\tfilesLoaded++\n\t}\n\n\t// Replay WAL after all snapshot files so it fills in data since the last snapshot.\n\tif walEntry != nil {\n\t\terr := func() error {\n\t\t\tf, err := os.Open(path.Join(dir, walEntry.Name()))\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\tdefer f.Close()\n\t\t\treturn l.loadWALFile(m, f, from)\n\t\t}()\n\t\tif err != nil {\n\t\t\t// WAL errors are non-fatal: the snapshot already loaded the bulk of data.\n\t\t\tcclog.Warnf(\"[METRICSTORE]> WAL replay error for %s: %v (data since last snapshot may be missing)\", dir, err)\n\t\t} else {\n\t\t\tfilesLoaded++\n\t\t}\n\t}\n\n\treturn filesLoaded, nil\n}\n\n// parseTimestampFromFilename extracts a Unix timestamp from a checkpoint filename.\n// Supports \".json\" (format: \".json\") and \".bin\" (format: \".bin\").\nfunc parseTimestampFromFilename(name string) (int64, error) {\n\tswitch {\n\tcase strings.HasSuffix(name, \".json\"):\n\t\treturn strconv.ParseInt(name[:len(name)-5], 10, 64)\n\tcase strings.HasSuffix(name, \".bin\"):\n\t\treturn strconv.ParseInt(name[:len(name)-4], 10, 64)\n\tdefault:\n\t\treturn 0, fmt.Errorf(\"unknown checkpoint extension for file %q\", name)\n\t}\n}\n\n// findFiles returns filenames from direntries whose timestamps satisfy the filter.\n// If findMoreRecentFiles is true, returns files with timestamps >= t (plus the\n// last file before t if t falls between two files).\nfunc findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {\n\tnums := map[string]int64{}\n\tfor _, e := range direntries {\n\t\tname := e.Name()\n\t\tif !strings.HasSuffix(name, \".json\") && !strings.HasSuffix(name, \".bin\") {\n\t\t\tcontinue\n\t\t}\n\n\t\tts, err := parseTimestampFromFilename(name)\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\t\tnums[name] = ts\n\t}\n\n\tsort.Slice(direntries, func(i, j int) bool {\n\t\ta, b := direntries[i], direntries[j]\n\t\treturn nums[a.Name()] < nums[b.Name()]\n\t})\n\n\tif len(nums) == 0 {\n\t\treturn nil, nil\n\t}\n\n\tfilenames := make([]string, 0)\n\n\tfor i, e := range direntries {\n\t\tts1 := nums[e.Name()]\n\n\t\tif findMoreRecentFiles && t <= ts1 {\n\t\t\tfilenames = append(filenames, e.Name())\n\t\t} else if !findMoreRecentFiles && ts1 <= t && ts1 != 0 {\n\t\t\tfilenames = append(filenames, e.Name())\n\t\t}\n\n\t\tif i == len(direntries)-1 {\n\t\t\tcontinue\n\t\t}\n\n\t\tenext := direntries[i+1]\n\t\tts2 := nums[enext.Name()]\n\n\t\tif findMoreRecentFiles {\n\t\t\tif ts1 < t && t < ts2 {\n\t\t\t\tfilenames = append(filenames, e.Name())\n\t\t\t}\n\t\t}\n\t}\n\n\treturn filenames, nil\n}\n","structuredPatch":[{"oldStart":339,"oldLines":25,"newStart":339,"newLines":35,"lines":[" return ErrNoNewArchiveData"," }"," ","- filepath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))","- f, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)","+ finalPath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))","+ tmpPath := finalPath + \".tmp\"","+","+ f, err := os.OpenFile(tmpPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)"," if err != nil && os.IsNotExist(err) {"," err = os.MkdirAll(dir, CheckpointDirPerms)"," if err == nil {","- f, err = os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)","+ f, err = os.OpenFile(tmpPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)"," }"," }"," if err != nil {"," return err"," }","- defer f.Close()"," "," bw := bufio.NewWriter(f)"," if err = json.NewEncoder(bw).Encode(cf); err != nil {","+ f.Close()","+ os.Remove(tmpPath)"," return err"," }"," ","- return bw.Flush()","+ if err = bw.Flush(); err != nil {","+ f.Close()","+ os.Remove(tmpPath)","+ return err","+ }","+ f.Close()","+","+ return os.Rename(tmpPath, finalPath)"," }"," "," // enqueueCheckpointHosts traverses checkpoint directory and enqueues cluster/host pairs."]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"a4926b20-3b5d-489c-aded-95da8c449e35","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"1f2ca6db-854e-4427-8cad-9e8dfd91673f","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_017fP5FYn7GZJWXeiP3G2eDJ","type":"message","role":"assistant","content":[{"type":"text","text":"## Fix 4: CleanUp uses `to` timestamp for file age\n\nThe `findFiles` function uses the filename timestamp (which is `from`) to determine age. But files cover `[from, to]`, and `to` could still be within the retention window. The cleanest fix is in the `cleanUpWorker` where we compute the cutoff time — we should subtract one checkpoint interval so that files whose `to` is still within retention aren't deleted.\n\nActually, let me re-read the cleanup logic more carefully. The `cleanUpWorker` computes `t := time.Now().Add(-d)` where `d` is the retention duration, then calls `CleanupCheckpoints(..., t.Unix(), ...)`. The `findFiles` with `findMoreRecentFiles=false` finds files where `ts1 <= t`. So a file named `{from}.bin` covering `[from, from+12h]` gets deleted when `from <= now - retention`, even though `from+12h` might still be within retention.\n\nThe fix: we should account for the checkpoint interval when computing the cleanup cutoff. Let me check how the cleanup interval relates to checkpoint interval.\n\nLooking at `cleanUpWorker`, it uses `Keys.RetentionInMemory` as the interval for the ticker AND for computing the cutoff. That means cleanup runs every retention period and deletes files older than retention. The issue is that files cover a span.\n\nThe simplest fix: subtract one checkpoint interval from the cutoff in `deleteCheckpoints`/`archiveCheckpoints`. But we don't have easy access to the checkpoint interval there. A better approach: change `findFiles` to also accept a `maxSpan` parameter... but that's complex.\n\nActually, the simplest and most correct fix is: in the cleanup worker, subtract the checkpoint interval from the cutoff time. Let me check where the checkpoint interval is accessible."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":705,"cache_read_input_tokens":39708,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":705},"output_tokens":6,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4Xq452gsCE7hcrKvQS","type":"assistant","uuid":"5e98050f-506b-4957-9326-ae38634f275e","timestamp":"2026-03-27T05:50:39.121Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"5e98050f-506b-4957-9326-ae38634f275e","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_017fP5FYn7GZJWXeiP3G2eDJ","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01PgSHU6M95FvtYv3Dm1NNKM","name":"Grep","input":{"pattern":"CheckpointInterval","path":"/Users/jan/tmp/cc-backend/pkg/metricstore","output_mode":"content","-n":true},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":705,"cache_read_input_tokens":39708,"output_tokens":547,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":705,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4Xq452gsCE7hcrKvQS","type":"assistant","uuid":"bcdd600c-5de5-4b9d-a55e-0dca74a82aa5","timestamp":"2026-03-27T05:50:39.715Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"bcdd600c-5de5-4b9d-a55e-0dca74a82aa5","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Grep","command":"callback"},"parentToolUseID":"toolu_01PgSHU6M95FvtYv3Dm1NNKM","toolUseID":"toolu_01PgSHU6M95FvtYv3Dm1NNKM","timestamp":"2026-03-27T05:50:39.739Z","uuid":"a73c816e-625b-47ae-acb5-8580693bb7d3","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"bcdd600c-5de5-4b9d-a55e-0dca74a82aa5","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01PgSHU6M95FvtYv3Dm1NNKM","type":"tool_result","content":"pkg/metricstore/checkpoint.go:106:\t\tif Keys.CheckpointInterval != \"\" {\npkg/metricstore/checkpoint.go:107:\t\t\tparsed, err := time.ParseDuration(Keys.CheckpointInterval)\npkg/metricstore/checkpoint.go:109:\t\t\t\tcclog.Errorf(\"[METRICSTORE]> invalid checkpoint-interval %q: %s, using default 12h\", Keys.CheckpointInterval, err)\npkg/metricstore/config.go:126:\tCheckpointInterval string `json:\"checkpoint-interval,omitempty\"`"}]},"uuid":"351b1dc8-efba-46e1-9858-6b02af28f49e","timestamp":"2026-03-27T05:50:39.738Z","toolUseResult":{"mode":"content","numFiles":0,"filenames":[],"content":"pkg/metricstore/checkpoint.go:106:\t\tif Keys.CheckpointInterval != \"\" {\npkg/metricstore/checkpoint.go:107:\t\t\tparsed, err := time.ParseDuration(Keys.CheckpointInterval)\npkg/metricstore/checkpoint.go:109:\t\t\t\tcclog.Errorf(\"[METRICSTORE]> invalid checkpoint-interval %q: %s, using default 12h\", Keys.CheckpointInterval, err)\npkg/metricstore/config.go:126:\tCheckpointInterval string `json:\"checkpoint-interval,omitempty\"`","numLines":4},"sourceToolAssistantUUID":"bcdd600c-5de5-4b9d-a55e-0dca74a82aa5","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"351b1dc8-efba-46e1-9858-6b02af28f49e","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_012vskgmzQL85SLu2ZwRLQqn","type":"message","role":"assistant","content":[{"type":"text","text":"The checkpoint interval is accessible via `Keys.CheckpointInterval`. Let me update the cleanup worker to account for this span."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":806,"cache_read_input_tokens":40413,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":806},"output_tokens":2,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4Yv9SPVGUYJASdzAuc","type":"assistant","uuid":"935703ad-25e3-4b2e-9920-87fccfebda71","timestamp":"2026-03-27T05:50:44.087Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"935703ad-25e3-4b2e-9920-87fccfebda71","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_012vskgmzQL85SLu2ZwRLQqn","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01JruR2RawwM8tWcnnAC5Unp","name":"Read","input":{"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/archive.go","offset":46,"limit":36},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":806,"cache_read_input_tokens":40413,"output_tokens":133,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":806,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4Yv9SPVGUYJASdzAuc","type":"assistant","uuid":"19363731-8427-4550-8c6a-e9511b6c9ebb","timestamp":"2026-03-27T05:50:44.721Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"19363731-8427-4550-8c6a-e9511b6c9ebb","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01JruR2RawwM8tWcnnAC5Unp","toolUseID":"toolu_01JruR2RawwM8tWcnnAC5Unp","timestamp":"2026-03-27T05:50:44.738Z","uuid":"d1ca2ccf-5896-4e07-bd5e-206e2ea42231","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"19363731-8427-4550-8c6a-e9511b6c9ebb","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01JruR2RawwM8tWcnnAC5Unp","type":"tool_result","content":" 46→func cleanUpWorker(wg *sync.WaitGroup, ctx context.Context, interval string, mode string, cleanupDir string, delete bool) {\n 47→\twg.Go(func() {\n 48→\t\td, err := time.ParseDuration(interval)\n 49→\t\tif err != nil {\n 50→\t\t\tcclog.Fatalf(\"[METRICSTORE]> error parsing %s interval duration: %v\\n\", mode, err)\n 51→\t\t}\n 52→\t\tif d <= 0 {\n 53→\t\t\treturn\n 54→\t\t}\n 55→\n 56→\t\tticker := time.NewTicker(d)\n 57→\t\tdefer ticker.Stop()\n 58→\n 59→\t\tfor {\n 60→\t\t\tselect {\n 61→\t\t\tcase <-ctx.Done():\n 62→\t\t\t\treturn\n 63→\t\t\tcase <-ticker.C:\n 64→\t\t\t\tt := time.Now().Add(-d)\n 65→\t\t\t\tcclog.Infof(\"[METRICSTORE]> start %s checkpoints (older than %s)...\", mode, t.Format(time.RFC3339))\n 66→\n 67→\t\t\t\tn, err := CleanupCheckpoints(Keys.Checkpoints.RootDir, cleanupDir, t.Unix(), delete)\n 68→\n 69→\t\t\t\tif err != nil {\n 70→\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> %s failed: %s\", mode, err.Error())\n 71→\t\t\t\t} else {\n 72→\t\t\t\t\tif delete {\n 73→\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoints deleted\", n)\n 74→\t\t\t\t\t} else {\n 75→\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files archived to parquet\", n)\n 76→\t\t\t\t\t}\n 77→\t\t\t\t}\n 78→\t\t\t}\n 79→\t\t}\n 80→\t})\n 81→}"}]},"uuid":"ebde39d5-84b4-499b-8619-6e515352aa10","timestamp":"2026-03-27T05:50:44.738Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/archive.go","content":"func cleanUpWorker(wg *sync.WaitGroup, ctx context.Context, interval string, mode string, cleanupDir string, delete bool) {\n\twg.Go(func() {\n\t\td, err := time.ParseDuration(interval)\n\t\tif err != nil {\n\t\t\tcclog.Fatalf(\"[METRICSTORE]> error parsing %s interval duration: %v\\n\", mode, err)\n\t\t}\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tt := time.Now().Add(-d)\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start %s checkpoints (older than %s)...\", mode, t.Format(time.RFC3339))\n\n\t\t\t\tn, err := CleanupCheckpoints(Keys.Checkpoints.RootDir, cleanupDir, t.Unix(), delete)\n\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> %s failed: %s\", mode, err.Error())\n\t\t\t\t} else {\n\t\t\t\t\tif delete {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoints deleted\", n)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files archived to parquet\", n)\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}","numLines":36,"startLine":46,"totalLines":343}},"sourceToolAssistantUUID":"19363731-8427-4550-8c6a-e9511b6c9ebb","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"ebde39d5-84b4-499b-8619-6e515352aa10","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01C4tzB3pjmzVqY926e2Bguh","type":"message","role":"assistant","content":[{"type":"text","text":"The issue: `t := time.Now().Add(-d)` uses the retention duration. A checkpoint file named `{from}.bin` covers data up to `from + checkpointInterval`. We should only delete files where `from + checkpointInterval <= now - retention`, i.e., `from <= now - retention - checkpointInterval`. So we need to subtract an additional checkpoint interval from the cutoff."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":623,"cache_read_input_tokens":41219,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":623},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4ZHVaZnsax5ETirRTC","type":"assistant","uuid":"9618b76a-f31f-4d6f-ba08-fda4ac28e67d","timestamp":"2026-03-27T05:50:50.380Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"9618b76a-f31f-4d6f-ba08-fda4ac28e67d","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01C4tzB3pjmzVqY926e2Bguh","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01RQVLN82nZR73UkSmw5Wjzu","name":"Edit","input":{"replace_all":false,"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/archive.go","old_string":"func cleanUpWorker(wg *sync.WaitGroup, ctx context.Context, interval string, mode string, cleanupDir string, delete bool) {\n\twg.Go(func() {\n\t\td, err := time.ParseDuration(interval)\n\t\tif err != nil {\n\t\t\tcclog.Fatalf(\"[METRICSTORE]> error parsing %s interval duration: %v\\n\", mode, err)\n\t\t}\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tt := time.Now().Add(-d)\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start %s checkpoints (older than %s)...\", mode, t.Format(time.RFC3339))","new_string":"func cleanUpWorker(wg *sync.WaitGroup, ctx context.Context, interval string, mode string, cleanupDir string, delete bool) {\n\twg.Go(func() {\n\t\td, err := time.ParseDuration(interval)\n\t\tif err != nil {\n\t\t\tcclog.Fatalf(\"[METRICSTORE]> error parsing %s interval duration: %v\\n\", mode, err)\n\t\t}\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\t// Account for checkpoint span: files named {from}.bin contain data up to\n\t\t// from+checkpointInterval. Subtract the checkpoint interval so we don't\n\t\t// delete files whose data still falls within the retention window.\n\t\tcheckpointSpan := 12 * time.Hour\n\t\tif Keys.CheckpointInterval != \"\" {\n\t\t\tif parsed, err := time.ParseDuration(Keys.CheckpointInterval); err == nil {\n\t\t\t\tcheckpointSpan = parsed\n\t\t\t}\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tt := time.Now().Add(-d).Add(-checkpointSpan)\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start %s checkpoints (older than %s)...\", mode, t.Format(time.RFC3339))"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":623,"cache_read_input_tokens":41219,"output_tokens":773,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":623,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4ZHVaZnsax5ETirRTC","type":"assistant","uuid":"7aca91bf-6a5f-41e2-a21e-783fc1fe7d28","timestamp":"2026-03-27T05:50:55.519Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"type":"file-history-snapshot","messageId":"7aca91bf-6a5f-41e2-a21e-783fc1fe7d28","snapshot":{"messageId":"bb5f87e3-8441-4923-a8f8-bd65d5319e3d","trackedFileBackups":{"pkg/metricstore/checkpoint.go":{"backupFileName":"5982c404552064a8@v1","version":1,"backupTime":"2026-03-27T05:49:59.434Z"},"pkg/metricstore/metricstore.go":{"backupFileName":"c51d908c5eab3a7e@v1","version":1,"backupTime":"2026-03-27T05:50:09.955Z"},"pkg/metricstore/archive.go":{"backupFileName":"2564056119165c8c@v1","version":1,"backupTime":"2026-03-27T05:50:55.532Z"}},"timestamp":"2026-03-27T05:49:00.537Z"},"isSnapshotUpdate":true} +{"parentUuid":"7aca91bf-6a5f-41e2-a21e-783fc1fe7d28","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Edit","command":"callback"},"parentToolUseID":"toolu_01RQVLN82nZR73UkSmw5Wjzu","toolUseID":"toolu_01RQVLN82nZR73UkSmw5Wjzu","timestamp":"2026-03-27T05:50:55.534Z","uuid":"4f42e37c-d1de-400b-9961-3e787b93a4ba","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"7aca91bf-6a5f-41e2-a21e-783fc1fe7d28","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01RQVLN82nZR73UkSmw5Wjzu","type":"tool_result","content":"The file /Users/jan/tmp/cc-backend/pkg/metricstore/archive.go has been updated successfully."}]},"uuid":"09287eb3-6657-4875-b150-5149b8b1372c","timestamp":"2026-03-27T05:50:55.534Z","toolUseResult":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/archive.go","oldString":"func cleanUpWorker(wg *sync.WaitGroup, ctx context.Context, interval string, mode string, cleanupDir string, delete bool) {\n\twg.Go(func() {\n\t\td, err := time.ParseDuration(interval)\n\t\tif err != nil {\n\t\t\tcclog.Fatalf(\"[METRICSTORE]> error parsing %s interval duration: %v\\n\", mode, err)\n\t\t}\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tt := time.Now().Add(-d)\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start %s checkpoints (older than %s)...\", mode, t.Format(time.RFC3339))","newString":"func cleanUpWorker(wg *sync.WaitGroup, ctx context.Context, interval string, mode string, cleanupDir string, delete bool) {\n\twg.Go(func() {\n\t\td, err := time.ParseDuration(interval)\n\t\tif err != nil {\n\t\t\tcclog.Fatalf(\"[METRICSTORE]> error parsing %s interval duration: %v\\n\", mode, err)\n\t\t}\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\t// Account for checkpoint span: files named {from}.bin contain data up to\n\t\t// from+checkpointInterval. Subtract the checkpoint interval so we don't\n\t\t// delete files whose data still falls within the retention window.\n\t\tcheckpointSpan := 12 * time.Hour\n\t\tif Keys.CheckpointInterval != \"\" {\n\t\t\tif parsed, err := time.ParseDuration(Keys.CheckpointInterval); err == nil {\n\t\t\t\tcheckpointSpan = parsed\n\t\t\t}\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tt := time.Now().Add(-d).Add(-checkpointSpan)\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start %s checkpoints (older than %s)...\", mode, t.Format(time.RFC3339))","originalFile":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\npackage metricstore\n\nimport (\n\t\"context\"\n\t\"errors\"\n\t\"fmt\"\n\t\"os\"\n\t\"path/filepath\"\n\t\"strings\"\n\t\"sync\"\n\t\"sync/atomic\"\n\t\"time\"\n\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n)\n\n// Worker for either Archiving or Deleting files\n\nfunc CleanUp(wg *sync.WaitGroup, ctx context.Context) {\n\tif Keys.Cleanup.Mode == \"archive\" {\n\t\tcclog.Info(\"[METRICSTORE]> enable archive cleanup to parquet\")\n\t\t// Run as Archiver\n\t\tcleanUpWorker(wg, ctx,\n\t\t\tKeys.RetentionInMemory,\n\t\t\t\"archiving\",\n\t\t\tKeys.Cleanup.RootDir,\n\t\t\tfalse,\n\t\t)\n\t} else {\n\t\t// Run as Deleter\n\t\tcleanUpWorker(wg, ctx,\n\t\t\tKeys.RetentionInMemory,\n\t\t\t\"deleting\",\n\t\t\t\"\",\n\t\t\ttrue,\n\t\t)\n\t}\n}\n\n// cleanUpWorker takes simple values to configure what it does\nfunc cleanUpWorker(wg *sync.WaitGroup, ctx context.Context, interval string, mode string, cleanupDir string, delete bool) {\n\twg.Go(func() {\n\t\td, err := time.ParseDuration(interval)\n\t\tif err != nil {\n\t\t\tcclog.Fatalf(\"[METRICSTORE]> error parsing %s interval duration: %v\\n\", mode, err)\n\t\t}\n\t\tif d <= 0 {\n\t\t\treturn\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tt := time.Now().Add(-d)\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start %s checkpoints (older than %s)...\", mode, t.Format(time.RFC3339))\n\n\t\t\t\tn, err := CleanupCheckpoints(Keys.Checkpoints.RootDir, cleanupDir, t.Unix(), delete)\n\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> %s failed: %s\", mode, err.Error())\n\t\t\t\t} else {\n\t\t\t\t\tif delete {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoints deleted\", n)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files archived to parquet\", n)\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t})\n}\n\nvar ErrNoNewArchiveData error = errors.New(\"all data already archived\")\n\n// CleanupCheckpoints deletes or archives all checkpoint files older than `from`.\n// When archiving, consolidates all hosts per cluster into a single Parquet file.\nfunc CleanupCheckpoints(checkpointsDir, cleanupDir string, from int64, deleteInstead bool) (int, error) {\n\tif deleteInstead {\n\t\treturn deleteCheckpoints(checkpointsDir, from)\n\t}\n\n\treturn archiveCheckpoints(checkpointsDir, cleanupDir, from)\n}\n\n// deleteCheckpoints removes checkpoint files older than `from` across all clusters/hosts.\nfunc deleteCheckpoints(checkpointsDir string, from int64) (int, error) {\n\tentries1, err := os.ReadDir(checkpointsDir)\n\tif err != nil {\n\t\treturn 0, err\n\t}\n\n\ttype workItem struct {\n\t\tdir string\n\t\tcluster, host string\n\t}\n\n\tvar wg sync.WaitGroup\n\tn, errs := int32(0), int32(0)\n\twork := make(chan workItem, Keys.NumWorkers)\n\n\twg.Add(Keys.NumWorkers)\n\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n\t\tgo func() {\n\t\t\tdefer wg.Done()\n\t\t\tfor item := range work {\n\t\t\t\tentries, err := os.ReadDir(item.dir)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"error reading %s/%s: %s\", item.cluster, item.host, err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t\tcontinue\n\t\t\t\t}\n\n\t\t\t\tfiles, err := findFiles(entries, from, false)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"error finding files in %s/%s: %s\", item.cluster, item.host, err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t\tcontinue\n\t\t\t\t}\n\n\t\t\t\tfor _, checkpoint := range files {\n\t\t\t\t\tif err := os.Remove(filepath.Join(item.dir, checkpoint)); err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"error deleting %s/%s/%s: %s\", item.cluster, item.host, checkpoint, err.Error())\n\t\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tatomic.AddInt32(&n, 1)\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}()\n\t}\n\n\tfor _, de1 := range entries1 {\n\t\tentries2, e := os.ReadDir(filepath.Join(checkpointsDir, de1.Name()))\n\t\tif e != nil {\n\t\t\terr = e\n\t\t\tcontinue\n\t\t}\n\n\t\tfor _, de2 := range entries2 {\n\t\t\twork <- workItem{\n\t\t\t\tdir: filepath.Join(checkpointsDir, de1.Name(), de2.Name()),\n\t\t\t\tcluster: de1.Name(),\n\t\t\t\thost: de2.Name(),\n\t\t\t}\n\t\t}\n\t}\n\n\tclose(work)\n\twg.Wait()\n\n\tif err != nil {\n\t\treturn int(n), err\n\t}\n\tif errs > 0 {\n\t\treturn int(n), fmt.Errorf(\"%d errors happened while deleting (%d successes)\", errs, n)\n\t}\n\treturn int(n), nil\n}\n\n// archiveCheckpoints archives checkpoint files to Parquet format.\n// Produces one Parquet file per cluster: //.parquet\n// Workers load checkpoint files from disk and send CheckpointFile trees on a\n// back-pressured channel. The main thread streams each tree directly to Parquet\n// rows without materializing all rows in memory.\nfunc archiveCheckpoints(checkpointsDir, cleanupDir string, from int64) (int, error) {\n\tcclog.Info(\"[METRICSTORE]> start archiving checkpoints to parquet\")\n\tstartTime := time.Now()\n\n\tclusterEntries, err := os.ReadDir(checkpointsDir)\n\tif err != nil {\n\t\treturn 0, err\n\t}\n\n\ttotalFiles := 0\n\tvar clusterErrors []string\n\n\tfor _, clusterEntry := range clusterEntries {\n\t\tif !clusterEntry.IsDir() {\n\t\t\tcontinue\n\t\t}\n\n\t\tcluster := clusterEntry.Name()\n\t\thostEntries, err := os.ReadDir(filepath.Join(checkpointsDir, cluster))\n\t\tif err != nil {\n\t\t\tcclog.Errorf(\"[METRICSTORE]> error reading host entries for cluster %s: %s\", cluster, err.Error())\n\t\t\tclusterErrors = append(clusterErrors, cluster)\n\t\t\tcontinue\n\t\t}\n\n\t\t// Workers load checkpoint files from disk; main thread writes to parquet.\n\t\ttype hostResult struct {\n\t\t\tcheckpoints []*CheckpointFile\n\t\t\thostname string\n\t\t\tfiles []string // checkpoint filenames to delete after successful write\n\t\t\tdir string // checkpoint directory for this host\n\t\t}\n\n\t\t// Small buffer provides back-pressure: at most NumWorkers+2 results in flight.\n\t\tresults := make(chan hostResult, 2)\n\t\twork := make(chan struct {\n\t\t\tdir, host string\n\t\t}, Keys.NumWorkers)\n\n\t\tvar wg sync.WaitGroup\n\t\terrs := int32(0)\n\n\t\twg.Add(Keys.NumWorkers)\n\t\tfor w := 0; w < Keys.NumWorkers; w++ {\n\t\t\tgo func() {\n\t\t\t\tdefer wg.Done()\n\t\t\t\tfor item := range work {\n\t\t\t\t\tcheckpoints, files, err := loadCheckpointFiles(item.dir, from)\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error reading checkpoints for %s/%s: %s\", cluster, item.host, err.Error())\n\t\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t\t\tcontinue\n\t\t\t\t\t}\n\t\t\t\t\tif len(checkpoints) > 0 {\n\t\t\t\t\t\tresults <- hostResult{\n\t\t\t\t\t\t\tcheckpoints: checkpoints,\n\t\t\t\t\t\t\thostname: item.host,\n\t\t\t\t\t\t\tfiles: files,\n\t\t\t\t\t\t\tdir: item.dir,\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}()\n\t\t}\n\n\t\tgo func() {\n\t\t\tfor _, hostEntry := range hostEntries {\n\t\t\t\tif !hostEntry.IsDir() {\n\t\t\t\t\tcontinue\n\t\t\t\t}\n\t\t\t\tdir := filepath.Join(checkpointsDir, cluster, hostEntry.Name())\n\t\t\t\twork <- struct {\n\t\t\t\t\tdir, host string\n\t\t\t\t}{dir: dir, host: hostEntry.Name()}\n\t\t\t}\n\t\t\tclose(work)\n\t\t\twg.Wait()\n\t\t\tclose(results)\n\t\t}()\n\n\t\t// Open streaming writer and write each host's checkpoint files as a row group\n\t\tparquetFile := filepath.Join(cleanupDir, cluster, fmt.Sprintf(\"%d.parquet\", from))\n\t\twriter, err := newParquetArchiveWriter(parquetFile)\n\t\tif err != nil {\n\t\t\t// Drain results channel to unblock workers\n\t\t\tfor range results {\n\t\t\t}\n\t\t\tcclog.Errorf(\"[METRICSTORE]> error creating parquet writer for cluster %s: %s\", cluster, err.Error())\n\t\t\tclusterErrors = append(clusterErrors, cluster)\n\t\t\tcontinue\n\t\t}\n\n\t\ttype deleteItem struct {\n\t\t\tdir string\n\t\t\tfiles []string\n\t\t}\n\t\tvar toDelete []deleteItem\n\t\twriteErr := error(nil)\n\n\t\tfor r := range results {\n\t\t\tif writeErr == nil {\n\t\t\t\t// Stream each checkpoint file directly to parquet rows.\n\t\t\t\t// Each checkpoint is processed and discarded before the next.\n\t\t\t\tfor _, cf := range r.checkpoints {\n\t\t\t\t\tif err := writer.WriteCheckpointFile(cf, cluster, r.hostname, \"node\", \"\"); err != nil {\n\t\t\t\t\t\twriteErr = err\n\t\t\t\t\t\tbreak\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Flush once per host to keep row group count within parquet limits.\n\t\t\t\tif writeErr == nil {\n\t\t\t\t\tif err := writer.FlushRowGroup(); err != nil {\n\t\t\t\t\t\twriteErr = err\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t\t// Always track files for deletion (even if write failed, we still drain)\n\t\t\ttoDelete = append(toDelete, deleteItem{dir: r.dir, files: r.files})\n\t\t}\n\n\t\tif err := writer.Close(); err != nil && writeErr == nil {\n\t\t\twriteErr = err\n\t\t}\n\n\t\tif errs > 0 {\n\t\t\tcclog.Errorf(\"[METRICSTORE]> %d errors reading checkpoints for cluster %s\", errs, cluster)\n\t\t\tclusterErrors = append(clusterErrors, cluster)\n\t\t\tos.Remove(parquetFile)\n\t\t\tcontinue\n\t\t}\n\n\t\tif writer.count == 0 {\n\t\t\t// No data written — remove empty file\n\t\t\tos.Remove(parquetFile)\n\t\t\tcontinue\n\t\t}\n\n\t\tif writeErr != nil {\n\t\t\tos.Remove(parquetFile)\n\t\t\tcclog.Errorf(\"[METRICSTORE]> error writing parquet archive for cluster %s: %s\", cluster, writeErr.Error())\n\t\t\tclusterErrors = append(clusterErrors, cluster)\n\t\t\tcontinue\n\t\t}\n\n\t\t// Delete archived checkpoint files\n\t\tfor _, item := range toDelete {\n\t\t\tfor _, file := range item.files {\n\t\t\t\tfilename := filepath.Join(item.dir, file)\n\t\t\t\tif err := os.Remove(filename); err != nil {\n\t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> could not remove archived checkpoint %s: %v\", filename, err)\n\t\t\t\t} else {\n\t\t\t\t\ttotalFiles++\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tcclog.Infof(\"[METRICSTORE]> archived %d rows from %d files for cluster %s to %s\",\n\t\t\twriter.count, totalFiles, cluster, parquetFile)\n\t}\n\n\tcclog.Infof(\"[METRICSTORE]> archiving checkpoints completed in %s (%d files)\", time.Since(startTime).Round(time.Millisecond), totalFiles)\n\n\tif len(clusterErrors) > 0 {\n\t\treturn totalFiles, fmt.Errorf(\"archiving failed for clusters: %s\", strings.Join(clusterErrors, \", \"))\n\t}\n\n\treturn totalFiles, nil\n}\n","structuredPatch":[{"oldStart":53,"oldLines":6,"newStart":53,"newLines":16,"lines":[" return"," }"," ","+ // Account for checkpoint span: files named {from}.bin contain data up to","+ // from+checkpointInterval. Subtract the checkpoint interval so we don't","+ // delete files whose data still falls within the retention window.","+ checkpointSpan := 12 * time.Hour","+ if Keys.CheckpointInterval != \"\" {","+ if parsed, err := time.ParseDuration(Keys.CheckpointInterval); err == nil {","+ checkpointSpan = parsed","+ }","+ }","+"," ticker := time.NewTicker(d)"," defer ticker.Stop()"," "]},{"oldStart":61,"oldLines":7,"newStart":71,"newLines":7,"lines":[" case <-ctx.Done():"," return"," case <-ticker.C:","- t := time.Now().Add(-d)","+ t := time.Now().Add(-d).Add(-checkpointSpan)"," cclog.Infof(\"[METRICSTORE]> start %s checkpoints (older than %s)...\", mode, t.Format(time.RFC3339))"," "," n, err := CleanupCheckpoints(Keys.Checkpoints.RootDir, cleanupDir, t.Unix(), delete)"]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"7aca91bf-6a5f-41e2-a21e-783fc1fe7d28","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"09287eb3-6657-4875-b150-5149b8b1372c","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_015MhQt5QF1GJW9eBuZ1yy4X","type":"message","role":"assistant","content":[{"type":"text","text":"Now let me add the `time` import to `archive.go` — let me check if it's already there."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":811,"cache_read_input_tokens":41842,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":811},"output_tokens":4,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4a5gx35BDUejBMHSBP","type":"assistant","uuid":"3c369aa2-471d-4e4e-aa10-ef661a27bb8c","timestamp":"2026-03-27T05:50:59.629Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"3c369aa2-471d-4e4e-aa10-ef661a27bb8c","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_015MhQt5QF1GJW9eBuZ1yy4X","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01HtVZDSfTvqsGx1VLFHtFzW","name":"Read","input":{"file_path":"/Users/jan/tmp/cc-backend/pkg/metricstore/archive.go","offset":8,"limit":14},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":811,"cache_read_input_tokens":41842,"output_tokens":132,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":811,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4a5gx35BDUejBMHSBP","type":"assistant","uuid":"324eda3c-57a6-4fae-8636-7d0008b848cc","timestamp":"2026-03-27T05:51:00.097Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"324eda3c-57a6-4fae-8636-7d0008b848cc","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01HtVZDSfTvqsGx1VLFHtFzW","toolUseID":"toolu_01HtVZDSfTvqsGx1VLFHtFzW","timestamp":"2026-03-27T05:51:00.106Z","uuid":"55f3136a-255d-4a45-b5fa-6eef5597186c","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"324eda3c-57a6-4fae-8636-7d0008b848cc","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01HtVZDSfTvqsGx1VLFHtFzW","type":"tool_result","content":" 8→import (\n 9→\t\"context\"\n 10→\t\"errors\"\n 11→\t\"fmt\"\n 12→\t\"os\"\n 13→\t\"path/filepath\"\n 14→\t\"strings\"\n 15→\t\"sync\"\n 16→\t\"sync/atomic\"\n 17→\t\"time\"\n 18→\n 19→\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n 20→)\n 21→"}]},"uuid":"e9c2c74e-3c7b-49e0-aa2e-faaf5d6924b8","timestamp":"2026-03-27T05:51:00.106Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/tmp/cc-backend/pkg/metricstore/archive.go","content":"import (\n\t\"context\"\n\t\"errors\"\n\t\"fmt\"\n\t\"os\"\n\t\"path/filepath\"\n\t\"strings\"\n\t\"sync\"\n\t\"sync/atomic\"\n\t\"time\"\n\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n)\n","numLines":14,"startLine":8,"totalLines":353}},"sourceToolAssistantUUID":"324eda3c-57a6-4fae-8636-7d0008b848cc","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"e9c2c74e-3c7b-49e0-aa2e-faaf5d6924b8","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_012MB2cNnTSkdyrKggnV3Qut","type":"message","role":"assistant","content":[{"type":"text","text":"Good, `time` is already imported. Now let me check if there are any tests that call `Checkpointing` directly."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":266,"cache_read_input_tokens":42653,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":266},"output_tokens":8,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4aRDSvYWUH9JMiattp","type":"assistant","uuid":"f538aaf2-1be3-4bb9-af44-a5ce40d9cabd","timestamp":"2026-03-27T05:51:03.545Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"f538aaf2-1be3-4bb9-af44-a5ce40d9cabd","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_012MB2cNnTSkdyrKggnV3Qut","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01T7ZZd14h3sPdkPkJV3dzzo","name":"Grep","input":{"pattern":"Checkpointing\\(","path":"/Users/jan/tmp/cc-backend","output_mode":"content","-n":true},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":266,"cache_read_input_tokens":42653,"output_tokens":149,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":266,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4aRDSvYWUH9JMiattp","type":"assistant","uuid":"33473131-3af3-4289-8eeb-645fa03a2a12","timestamp":"2026-03-27T05:51:04.150Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"33473131-3af3-4289-8eeb-645fa03a2a12","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Grep","command":"callback"},"parentToolUseID":"toolu_01T7ZZd14h3sPdkPkJV3dzzo","toolUseID":"toolu_01T7ZZd14h3sPdkPkJV3dzzo","timestamp":"2026-03-27T05:51:04.199Z","uuid":"24e9ba8c-4db6-4f84-92eb-d496ef1e1f69","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"33473131-3af3-4289-8eeb-645fa03a2a12","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01T7ZZd14h3sPdkPkJV3dzzo","type":"tool_result","content":"pkg/metricstore/checkpoint.go:12:// - Periodic background checkpointing via the Checkpointing() worker\npkg/metricstore/checkpoint.go:22:// 2. Checkpointing() worker periodically saves new data\npkg/metricstore/checkpoint.go:96:func Checkpointing(wg *sync.WaitGroup, ctx context.Context, restoreFrom time.Time) {\npkg/metricstore/config.go:137:// Accessed by Init(), Checkpointing(), and other lifecycle functions.\npkg/metricstore/metricstore.go:173:\tCheckpointing(wg, ctx, restoreFrom)"}]},"uuid":"92708f85-713b-44f4-995b-15d786689844","timestamp":"2026-03-27T05:51:04.199Z","toolUseResult":{"mode":"content","numFiles":0,"filenames":[],"content":"pkg/metricstore/checkpoint.go:12:// - Periodic background checkpointing via the Checkpointing() worker\npkg/metricstore/checkpoint.go:22:// 2. Checkpointing() worker periodically saves new data\npkg/metricstore/checkpoint.go:96:func Checkpointing(wg *sync.WaitGroup, ctx context.Context, restoreFrom time.Time) {\npkg/metricstore/config.go:137:// Accessed by Init(), Checkpointing(), and other lifecycle functions.\npkg/metricstore/metricstore.go:173:\tCheckpointing(wg, ctx, restoreFrom)","numLines":5},"sourceToolAssistantUUID":"33473131-3af3-4289-8eeb-645fa03a2a12","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"92708f85-713b-44f4-995b-15d786689844","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01P2KX2YK7wg8cS85dPxD3o3","type":"message","role":"assistant","content":[{"type":"text","text":"Only called from `Init`, no tests to update. Let me verify the build compiles."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":315,"cache_read_input_tokens":42919,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":315},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4aik9NsCLYovPz4v7z","type":"assistant","uuid":"cfb5ee19-12e7-4d48-b62e-61e3e5d02078","timestamp":"2026-03-27T05:51:10.715Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"cfb5ee19-12e7-4d48-b62e-61e3e5d02078","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01P2KX2YK7wg8cS85dPxD3o3","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01Xf8Yhkbh2MsBTHmREELsCT","name":"Bash","input":{"command":"go build ./pkg/metricstore/ 2>&1","description":"Build metricstore package"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":315,"cache_read_input_tokens":42919,"output_tokens":117,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":315,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4aik9NsCLYovPz4v7z","type":"assistant","uuid":"eaa61699-9ddd-4605-b3f6-9d7a212b44da","timestamp":"2026-03-27T05:51:11.455Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"eaa61699-9ddd-4605-b3f6-9d7a212b44da","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01Xf8Yhkbh2MsBTHmREELsCT","type":"tool_result","content":"(Bash completed with no output)","is_error":false}]},"uuid":"47616114-d68a-45b8-bd44-276817a2b24e","timestamp":"2026-03-27T05:51:26.029Z","toolUseResult":{"stdout":"","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"eaa61699-9ddd-4605-b3f6-9d7a212b44da","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"47616114-d68a-45b8-bd44-276817a2b24e","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01WdLKKxSG3RGXzwuc3abbhU","type":"message","role":"assistant","content":[{"type":"text","text":"Clean build. Let me also verify the full project builds."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":234,"cache_read_input_tokens":43234,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":234},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4cKzjFCun8rcindtQ5","type":"assistant","uuid":"6ad35e40-a72a-4862-8111-b75add8be7ca","timestamp":"2026-03-27T05:51:29.555Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"6ad35e40-a72a-4862-8111-b75add8be7ca","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01WdLKKxSG3RGXzwuc3abbhU","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01AG277YPtnsKrpJKw1UoGJC","name":"Bash","input":{"command":"go build ./... 2>&1","description":"Build entire project"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":234,"cache_read_input_tokens":43234,"output_tokens":103,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":234,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4cKzjFCun8rcindtQ5","type":"assistant","uuid":"39edf2ce-3f65-4c83-a934-c1bdd729a5ea","timestamp":"2026-03-27T05:51:30.089Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"39edf2ce-3f65-4c83-a934-c1bdd729a5ea","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01AG277YPtnsKrpJKw1UoGJC","type":"tool_result","content":"(Bash completed with no output)","is_error":false}]},"uuid":"37111134-ec92-47b9-8429-87c851f0d60b","timestamp":"2026-03-27T05:51:38.301Z","toolUseResult":{"stdout":"","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"39edf2ce-3f65-4c83-a934-c1bdd729a5ea","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"37111134-ec92-47b9-8429-87c851f0d60b","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_015GaDE87YkA7utLoqwp4Ze3","type":"message","role":"assistant","content":[{"type":"text","text":"Let me run the tests."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":109,"cache_read_input_tokens":43468,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":109},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZT4dEVcPbLkxZDSrnn9v","type":"assistant","uuid":"651a2a51-f122-44ae-98bf-137f7fed5006","timestamp":"2026-03-27T05:51:41.985Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"651a2a51-f122-44ae-98bf-137f7fed5006","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_015GaDE87YkA7utLoqwp4Ze3","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_012CVgSZM5ehzoU2uiEoJ2fJ","name":"Bash","input":{"command":"go test ./pkg/metricstore/... 2>&1","description":"Run metricstore tests","timeout":120000},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":109,"cache_read_input_tokens":43468,"output_tokens":111,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":109,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4dEVcPbLkxZDSrnn9v","type":"assistant","uuid":"c858f9b7-66a5-4336-aa52-be967141daf0","timestamp":"2026-03-27T05:51:42.592Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"c858f9b7-66a5-4336-aa52-be967141daf0","isSidechain":false,"promptId":"615a2ba3-92ea-4fa1-883c-187ea91ca692","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_012CVgSZM5ehzoU2uiEoJ2fJ","type":"tool_result","content":"ok \tgithub.com/ClusterCockpit/cc-backend/pkg/metricstore\t0.440s","is_error":false}]},"uuid":"131029df-7092-4a99-96c9-d7a0529932dc","timestamp":"2026-03-27T05:51:45.607Z","toolUseResult":{"stdout":"ok \tgithub.com/ClusterCockpit/cc-backend/pkg/metricstore\t0.440s","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"c858f9b7-66a5-4336-aa52-be967141daf0","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"131029df-7092-4a99-96c9-d7a0529932dc","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01D6PdKt9SuRH17iS2JXtjnt","type":"message","role":"assistant","content":[{"type":"text","text":"All tests pass. Here's a summary of the four fixes:\n\n### Fix 1 (Primary): Prevent data loss after restart\n- **`checkpoint.go:96`**: `Checkpointing()` now accepts a `restoreFrom time.Time` parameter and initializes `lastCheckpoint = restoreFrom` instead of `time.Now()`. This ensures the first periodic checkpoint covers the entire loaded retention window, not just data since restart.\n- **`checkpoint.go:473`**: Loaded buffers now set `archived: false` instead of `true`. This allows `toCheckpointFile` to include loaded data in new checkpoints, ensuring it gets re-persisted before old files are cleaned up.\n- **`metricstore.go:173`**: Passes `restoreFrom` to `Checkpointing()`.\n\n**Trade-off**: The first checkpoint after restart is larger (covers full retention window). This is a one-time cost for correctness.\n\n### Fix 3: JSON checkpoint atomic writes\n- **`checkpoint.go:340-358`**: JSON checkpoints now write to a `.json.tmp` file and `os.Rename` to the final path, matching the binary format's crash-safe pattern.\n\n### Fix 4: CleanUp accounts for checkpoint span\n- **`archive.go:64`**: The cleanup cutoff time now subtracts the checkpoint interval (default 12h) in addition to the retention duration. This prevents premature deletion of files whose `from` timestamp is outside retention but whose data (`to`) is still within retention.\n\n### Bug 2 (not fixed)\nThe partial checkpoint failure / `lastCheckpoint` not updated issue was noted as medium severity. The current behavior (re-checkpointing from the old `from` time on retry) is actually conservative — it ensures no data is missed. The redundant writes are a performance cost but not a correctness issue."}],"stop_reason":"end_turn","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":150,"cache_read_input_tokens":43577,"output_tokens":425,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":150,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZT4dmhq2kus7mGiZ5gs2","type":"assistant","uuid":"76e11917-0cde-447e-8979-115696f7c52b","timestamp":"2026-03-27T05:51:58.987Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} +{"parentUuid":"76e11917-0cde-447e-8979-115696f7c52b","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"Stop","hookName":"Stop","command":"entire hooks claude-code stop"},"parentToolUseID":"f580d8a7-07f8-49cf-b209-10bb60819ae6","toolUseID":"f580d8a7-07f8-49cf-b209-10bb60819ae6","timestamp":"2026-03-27T05:51:59.028Z","uuid":"ec892be9-4325-426c-9069-c472bed417fc","userType":"external","entrypoint":"cli","cwd":"/Users/jan/tmp/cc-backend","sessionId":"be491009-4de6-4152-bb5c-e5bb34ff496e","version":"2.1.80","gitBranch":"hotfix","slug":"cozy-sparking-fairy"} diff --git a/3f/4d366b037c/0/metadata.json b/3f/4d366b037c/0/metadata.json new file mode 100644 index 00000000..970289b5 --- /dev/null +++ b/3f/4d366b037c/0/metadata.json @@ -0,0 +1,35 @@ +{ + "cli_version": "0.5.1", + "checkpoint_id": "3f4d366b037c", + "session_id": "be491009-4de6-4152-bb5c-e5bb34ff496e", + "strategy": "manual-commit", + "created_at": "2026-03-27T06:01:00.802361Z", + "branch": "fix/checkpoint-gap", + "checkpoints_count": 1, + "files_touched": [ + "pkg/metricstore/archive.go", + "pkg/metricstore/checkpoint.go", + "pkg/metricstore/metricstore.go" + ], + "agent": "Claude Code", + "turn_id": "2d4bc75fdf7a", + "token_usage": { + "input_tokens": 26, + "cache_creation_tokens": 38065, + "cache_read_tokens": 858381, + "output_tokens": 6040, + "api_call_count": 24 + }, + "session_metrics": { + "turn_count": 1 + }, + "initial_attribution": { + "calculated_at": "2026-03-27T06:01:00.71301Z", + "agent_lines": 33, + "human_added": 0, + "human_modified": 0, + "human_removed": 0, + "total_committed": 33, + "agent_percentage": 100 + } +} diff --git a/3f/4d366b037c/metadata.json b/3f/4d366b037c/metadata.json new file mode 100644 index 00000000..0713f1cd --- /dev/null +++ b/3f/4d366b037c/metadata.json @@ -0,0 +1,27 @@ +{ + "cli_version": "0.5.1", + "checkpoint_id": "3f4d366b037c", + "strategy": "manual-commit", + "branch": "fix/checkpoint-gap", + "checkpoints_count": 1, + "files_touched": [ + "pkg/metricstore/archive.go", + "pkg/metricstore/checkpoint.go", + "pkg/metricstore/metricstore.go" + ], + "sessions": [ + { + "metadata": "/3f/4d366b037c/0/metadata.json", + "transcript": "/3f/4d366b037c/0/full.jsonl", + "content_hash": "/3f/4d366b037c/0/content_hash.txt", + "prompt": "" + } + ], + "token_usage": { + "input_tokens": 26, + "cache_creation_tokens": 38065, + "cache_read_tokens": 858381, + "output_tokens": 6040, + "api_call_count": 24 + } +}