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new file mode 100644
index 00000000..00028b0c
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new file mode 100644
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+{"parentUuid":"6afe5f5f-c5bc-4a02-8adb-37d83aeb078b","isSidechain":false,"promptId":"bf1a2a8c-5f1a-4688-91c9-f9d2413ee03d","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01QY63Gm5K7K3wg4n4RffQGx","type":"tool_result","content":"1\t// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n2\t// All rights reserved. This file is part of cc-backend.\n3\t// Use of this source code is governed by a MIT-style\n4\t// license that can be found in the LICENSE file.\n5\t\n6\t// This file implements checkpoint persistence for the in-memory metric store.\n7\t//\n8\t// Checkpoints enable graceful restarts by periodically saving in-memory metric\n9\t// data to disk in JSON or binary format. The checkpoint system:\n10\t//\n11\t// Key Features:\n12\t//   - Periodic background checkpointing via the Checkpointing() worker\n13\t//   - Two format families: JSON (human-readable) and WAL+binary (compact, crash-safe)\n14\t//   - Parallel checkpoint creation and loading using worker pools\n15\t//   - Hierarchical file organization: checkpoint_dir/cluster/host/timestamp.{json|bin}\n16\t//   - WAL file: checkpoint_dir/cluster/host/current.wal (append-only, per-entry)\n17\t//   - Only saves unarchived data (archived data is already persisted elsewhere)\n18\t//   - GC optimization during loading to prevent excessive heap growth\n19\t//\n20\t// Checkpoint Workflow:\n21\t//  1. Init() loads checkpoints within retention window at startup\n22\t//  2. Checkpointing() worker periodically saves new data\n23\t//  3. Shutdown() writes final checkpoint before exit\n24\t//\n25\t// File Organization:\n26\t//\n27\t//\tcheckpoints/\n28\t//\t  cluster1/\n29\t//\t    host001/\n30\t//\t      1234567890.json  (JSON format: full subtree snapshot)\n31\t//\t      1234567890.bin   (binary format: full subtree snapshot)\n32\t//\t      current.wal      (WAL format: append-only per-entry log)\n33\t//\t    host002/\n34\t//\t      ...\n35\tpackage metricstore\n36\t\n37\timport (\n38\t\t\"bufio\"\n39\t\t\"context\"\n40\t\t\"encoding/json\"\n41\t\t\"errors\"\n42\t\t\"fmt\"\n43\t\t\"io/fs\"\n44\t\t\"os\"\n45\t\t\"path\"\n46\t\t\"path/filepath\"\n47\t\t\"sort\"\n48\t\t\"strconv\"\n49\t\t\"strings\"\n50\t\t\"sync\"\n51\t\t\"sync/atomic\"\n52\t\t\"time\"\n53\t\n54\t\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n55\t\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n56\t)\n57\t\n58\tconst (\n59\t\tCheckpointFilePerms = 0o644                    // File permissions for checkpoint files\n60\t\tCheckpointDirPerms  = 0o755                    // Directory permissions for checkpoint directories\n61\t\tGCTriggerInterval   = DefaultGCTriggerInterval // Interval for triggering GC during checkpoint loading\n62\t)\n63\t\n64\t// CheckpointMetrics represents metric data in a checkpoint file.\n65\t// Whenever the structure changes, update MarshalJSON as well!\n66\ttype CheckpointMetrics struct {\n67\t\tData      []schema.Float `json:\"data\"`\n68\t\tFrequency int64          `json:\"frequency\"`\n69\t\tStart     int64          `json:\"start\"`\n70\t}\n71\t\n72\t// CheckpointFile represents the hierarchical structure of a checkpoint file.\n73\t// It mirrors the Level tree structure from the MemoryStore.\n74\ttype CheckpointFile struct {\n75\t\tMetrics  map[string]*CheckpointMetrics `json:\"metrics\"`\n76\t\tChildren map[string]*CheckpointFile    `json:\"children\"`\n77\t\tFrom     int64                         `json:\"from\"`\n78\t\tTo       int64                         `json:\"to\"`\n79\t}\n80\t\n81\t// lastCheckpoint tracks the timestamp of the last checkpoint creation.\n82\tvar (\n83\t\tlastCheckpoint   time.Time\n84\t\tlastCheckpointMu sync.Mutex\n85\t)\n86\t\n87\t// Checkpointing starts a background worker that periodically saves metric data to disk.\n88\t//\n89\t// The checkpoint interval is read from Keys.CheckpointInterval (default: 12 hours).\n90\t//\n91\t// Format behaviour:\n92\t//   - \"json\": Writes a JSON snapshot file per host every interval\n93\t//   - \"wal\":  Writes a binary snapshot file per host every interval, then rotates\n94\t//     the current.wal files for all successfully checkpointed hosts\n95\tfunc Checkpointing(wg *sync.WaitGroup, ctx context.Context) {\n96\t\tlastCheckpointMu.Lock()\n97\t\tlastCheckpoint = time.Now()\n98\t\tlastCheckpointMu.Unlock()\n99\t\n100\t\tms := GetMemoryStore()\n101\t\n102\t\twg.Go(func() {\n103\t\t\td := 12 * time.Hour // default checkpoint interval\n104\t\t\tif Keys.CheckpointInterval != \"\" {\n105\t\t\t\tparsed, err := time.ParseDuration(Keys.CheckpointInterval)\n106\t\t\t\tif err != nil {\n107\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> invalid checkpoint-interval %q: %s, using default 12h\", Keys.CheckpointInterval, err)\n108\t\t\t\t} else {\n109\t\t\t\t\td = parsed\n110\t\t\t\t}\n111\t\t\t}\n112\t\n113\t\t\tticker := time.NewTicker(d)\n114\t\t\tdefer ticker.Stop()\n115\t\n116\t\t\tfor {\n117\t\t\t\tselect {\n118\t\t\t\tcase <-ctx.Done():\n119\t\t\t\t\treturn\n120\t\t\t\tcase <-ticker.C:\n121\t\t\t\t\tlastCheckpointMu.Lock()\n122\t\t\t\t\tfrom := lastCheckpoint\n123\t\t\t\t\tlastCheckpointMu.Unlock()\n124\t\n125\t\t\t\t\tnow := time.Now()\n126\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> start checkpointing (starting at %s)...\", from.Format(time.RFC3339))\n127\t\n128\t\t\t\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n129\t\t\t\t\t\t// Pause WAL writes: the binary snapshot captures all in-memory\n130\t\t\t\t\t\t// data, so WAL records written during checkpoint are redundant\n131\t\t\t\t\t\t// and would be deleted during rotation anyway.\n132\t\t\t\t\t\twalCheckpointActive.Store(true)\n133\t\t\t\t\t\tn, hostDirs, err := ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n134\t\t\t\t\t\tif err != nil {\n135\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> binary checkpointing failed: %s\", err.Error())\n136\t\t\t\t\t\t}\n137\t\t\t\t\t\tif n > 0 {\n138\t\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d binary snapshot files created\", n)\n139\t\t\t\t\t\t\tlastCheckpointMu.Lock()\n140\t\t\t\t\t\t\tlastCheckpoint = now\n141\t\t\t\t\t\t\tlastCheckpointMu.Unlock()\n142\t\t\t\t\t\t\t// Rotate WAL files for successfully checkpointed hosts.\n143\t\t\t\t\t\t\tRotateWALFiles(hostDirs)\n144\t\t\t\t\t\t}\n145\t\t\t\t\t\twalCheckpointActive.Store(false)\n146\t\t\t\t\t\twalDropped.Store(0)\n147\t\t\t\t\t} else {\n148\t\t\t\t\t\tn, err := ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n149\t\t\t\t\t\tif err != nil {\n150\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> checkpointing failed: %s\", err.Error())\n151\t\t\t\t\t\t} else {\n152\t\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files created\", n)\n153\t\t\t\t\t\t\tlastCheckpointMu.Lock()\n154\t\t\t\t\t\t\tlastCheckpoint = now\n155\t\t\t\t\t\t\tlastCheckpointMu.Unlock()\n156\t\t\t\t\t\t}\n157\t\t\t\t\t}\n158\t\t\t\t}\n159\t\t\t}\n160\t\t})\n161\t}\n162\t\n163\t// MarshalJSON provides optimized JSON encoding for CheckpointMetrics.\n164\t//\n165\t// Since schema.Float has custom MarshalJSON, serializing []Float has significant overhead.\n166\t// This method manually constructs JSON to avoid allocations and interface conversions.\n167\tfunc (cm *CheckpointMetrics) MarshalJSON() ([]byte, error) {\n168\t\tbuf := make([]byte, 0, 128+len(cm.Data)*8)\n169\t\tbuf = append(buf, `{\"frequency\":`...)\n170\t\tbuf = strconv.AppendInt(buf, cm.Frequency, 10)\n171\t\tbuf = append(buf, `,\"start\":`...)\n172\t\tbuf = strconv.AppendInt(buf, cm.Start, 10)\n173\t\tbuf = append(buf, `,\"data\":[`...)\n174\t\tfor i, x := range cm.Data {\n175\t\t\tif i != 0 {\n176\t\t\t\tbuf = append(buf, ',')\n177\t\t\t}\n178\t\t\tif x.IsNaN() {\n179\t\t\t\tbuf = append(buf, `null`...)\n180\t\t\t} else {\n181\t\t\t\tbuf = strconv.AppendFloat(buf, float64(x), 'f', 1, 32)\n182\t\t\t}\n183\t\t}\n184\t\tbuf = append(buf, `]}`...)\n185\t\treturn buf, nil\n186\t}\n187\t\n188\t// ToCheckpoint writes metric data to checkpoint files in parallel (JSON format).\n189\t//\n190\t// Metrics at root and cluster levels are skipped. One file per host is created.\n191\t// Uses worker pool (Keys.NumWorkers) for parallel processing. Only locks one host\n192\t// at a time, allowing concurrent writes/reads to other hosts.\n193\t//\n194\t// Returns the number of checkpoint files created and any errors encountered.\n195\tfunc (m *MemoryStore) ToCheckpoint(dir string, from, to int64) (int, error) {\n196\t\t// Pre-calculate capacity by counting cluster/host pairs\n197\t\tm.root.lock.RLock()\n198\t\ttotalHosts := 0\n199\t\tfor _, l1 := range m.root.children {\n200\t\t\tl1.lock.RLock()\n201\t\t\ttotalHosts += len(l1.children)\n202\t\t\tl1.lock.RUnlock()\n203\t\t}\n204\t\tm.root.lock.RUnlock()\n205\t\n206\t\tlevels := make([]*Level, 0, totalHosts)\n207\t\tselectors := make([][]string, 0, totalHosts)\n208\t\n209\t\tm.root.lock.RLock()\n210\t\tfor sel1, l1 := range m.root.children {\n211\t\t\tl1.lock.RLock()\n212\t\t\tfor sel2, l2 := range l1.children {\n213\t\t\t\tlevels = append(levels, l2)\n214\t\t\t\tselectors = append(selectors, []string{sel1, sel2})\n215\t\t\t}\n216\t\t\tl1.lock.RUnlock()\n217\t\t}\n218\t\tm.root.lock.RUnlock()\n219\t\n220\t\ttype workItem struct {\n221\t\t\tlevel    *Level\n222\t\t\tdir      string\n223\t\t\tselector []string\n224\t\t}\n225\t\n226\t\tn, errs := int32(0), int32(0)\n227\t\n228\t\tvar wg sync.WaitGroup\n229\t\twg.Add(Keys.NumWorkers)\n230\t\twork := make(chan workItem, Keys.NumWorkers*2)\n231\t\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n232\t\t\tgo func() {\n233\t\t\t\tdefer wg.Done()\n234\t\n235\t\t\t\tfor workItem := range work {\n236\t\t\t\t\tif err := workItem.level.toCheckpoint(workItem.dir, from, to, m); err != nil {\n237\t\t\t\t\t\tif err == ErrNoNewArchiveData {\n238\t\t\t\t\t\t\tcontinue\n239\t\t\t\t\t\t}\n240\t\n241\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while checkpointing %#v: %s\", workItem.selector, err.Error())\n242\t\t\t\t\t\tatomic.AddInt32(&errs, 1)\n243\t\t\t\t\t} else {\n244\t\t\t\t\t\tatomic.AddInt32(&n, 1)\n245\t\t\t\t\t}\n246\t\t\t\t}\n247\t\t\t}()\n248\t\t}\n249\t\n250\t\tfor i := 0; i < len(levels); i++ {\n251\t\t\tdir := path.Join(dir, path.Join(selectors[i]...))\n252\t\t\twork <- workItem{\n253\t\t\t\tlevel:    levels[i],\n254\t\t\t\tdir:      dir,\n255\t\t\t\tselector: selectors[i],\n256\t\t\t}\n257\t\t}\n258\t\n259\t\tclose(work)\n260\t\twg.Wait()\n261\t\n262\t\tif errs > 0 {\n263\t\t\treturn int(n), fmt.Errorf(\"[METRICSTORE]> %d errors happened while creating checkpoints (%d successes)\", errs, n)\n264\t\t}\n265\t\treturn int(n), nil\n266\t}\n267\t\n268\t// toCheckpointFile recursively converts a Level tree to CheckpointFile structure.\n269\t// Skips metrics that are already archived. Returns nil if no unarchived data exists.\n270\tfunc (l *Level) toCheckpointFile(from, to int64, m *MemoryStore) (*CheckpointFile, error) {\n271\t\tl.lock.RLock()\n272\t\tdefer l.lock.RUnlock()\n273\t\n274\t\tretval := &CheckpointFile{\n275\t\t\tFrom:     from,\n276\t\t\tTo:       to,\n277\t\t\tMetrics:  make(map[string]*CheckpointMetrics),\n278\t\t\tChildren: make(map[string]*CheckpointFile),\n279\t\t}\n280\t\n281\t\tfor metric, minfo := range m.Metrics {\n282\t\t\tb := l.metrics[minfo.offset]\n283\t\t\tif b == nil {\n284\t\t\t\tcontinue\n285\t\t\t}\n286\t\n287\t\t\tallArchived := true\n288\t\t\tb.iterFromTo(from, to, func(b *buffer) error {\n289\t\t\t\tif !b.archived {\n290\t\t\t\t\tallArchived = false\n291\t\t\t\t\treturn fmt.Errorf(\"stop\") // Early termination signal\n292\t\t\t\t}\n293\t\t\t\treturn nil\n294\t\t\t})\n295\t\n296\t\t\tif allArchived {\n297\t\t\t\tcontinue\n298\t\t\t}\n299\t\n300\t\t\tdata := make([]schema.Float, (to-from)/b.frequency+1)\n301\t\t\tdata, start, end, err := b.read(from, to, data)\n302\t\t\tif err != nil {\n303\t\t\t\treturn nil, err\n304\t\t\t}\n305\t\n306\t\t\tfor i := int((end - start) / b.frequency); i < len(data); i++ {\n307\t\t\t\tdata[i] = schema.NaN\n308\t\t\t}\n309\t\n310\t\t\tretval.Metrics[metric] = &CheckpointMetrics{\n311\t\t\t\tFrequency: b.frequency,\n312\t\t\t\tStart:     start,\n313\t\t\t\tData:      data,\n314\t\t\t}\n315\t\t}\n316\t\n317\t\tfor name, child := range l.children {\n318\t\t\tval, err := child.toCheckpointFile(from, to, m)\n319\t\t\tif err != nil {\n320\t\t\t\treturn nil, err\n321\t\t\t}\n322\t\n323\t\t\tif val != nil {\n324\t\t\t\tretval.Children[name] = val\n325\t\t\t}\n326\t\t}\n327\t\n328\t\tif len(retval.Children) == 0 && len(retval.Metrics) == 0 {\n329\t\t\treturn nil, nil\n330\t\t}\n331\t\n332\t\treturn retval, nil\n333\t}\n334\t\n335\t// toCheckpoint writes a Level's data to a JSON checkpoint file.\n336\t// Creates directory if needed. Returns ErrNoNewArchiveData if nothing to save.\n337\tfunc (l *Level) toCheckpoint(dir string, from, to int64, m *MemoryStore) error {\n338\t\tcf, err := l.toCheckpointFile(from, to, m)\n339\t\tif err != nil {\n340\t\t\treturn err\n341\t\t}\n342\t\n343\t\tif cf == nil {\n344\t\t\treturn ErrNoNewArchiveData\n345\t\t}\n346\t\n347\t\tfilepath := path.Join(dir, fmt.Sprintf(\"%d.json\", from))\n348\t\tf, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n349\t\tif err != nil && os.IsNotExist(err) {\n350\t\t\terr = os.MkdirAll(dir, CheckpointDirPerms)\n351\t\t\tif err == nil {\n352\t\t\t\tf, err = os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n353\t\t\t}\n354\t\t}\n355\t\tif err != nil {\n356\t\t\treturn err\n357\t\t}\n358\t\tdefer f.Close()\n359\t\n360\t\tbw := bufio.NewWriter(f)\n361\t\tif err = json.NewEncoder(bw).Encode(cf); err != nil {\n362\t\t\treturn err\n363\t\t}\n364\t\n365\t\treturn bw.Flush()\n366\t}\n367\t\n368\t// enqueueCheckpointHosts traverses checkpoint directory and enqueues cluster/host pairs.\n369\t// Returns error if directory structure is invalid.\n370\tfunc enqueueCheckpointHosts(dir string, work chan<- [2]string) error {\n371\t\tclustersDir, err := os.ReadDir(dir)\n372\t\tif err != nil {\n373\t\t\treturn err\n374\t\t}\n375\t\n376\t\tfor _, clusterDir := range clustersDir {\n377\t\t\tif !clusterDir.IsDir() {\n378\t\t\t\treturn errors.New(\"[METRICSTORE]> expected only directories at first level of checkpoints/ directory\")\n379\t\t\t}\n380\t\n381\t\t\thostsDir, err := os.ReadDir(filepath.Join(dir, clusterDir.Name()))\n382\t\t\tif err != nil {\n383\t\t\t\treturn err\n384\t\t\t}\n385\t\n386\t\t\tfor _, hostDir := range hostsDir {\n387\t\t\t\tif !hostDir.IsDir() {\n388\t\t\t\t\treturn errors.New(\"[METRICSTORE]> expected only directories at second level of checkpoints/ directory\")\n389\t\t\t\t}\n390\t\n391\t\t\t\twork <- [2]string{clusterDir.Name(), hostDir.Name()}\n392\t\t\t}\n393\t\t}\n394\t\n395\t\treturn nil\n396\t}\n397\t\n398\t// FromCheckpoint loads checkpoint files from disk into memory in parallel.\n399\t//\n400\t// Uses worker pool to load cluster/host combinations. Returns number of files\n401\t// loaded and any errors.\n402\tfunc (m *MemoryStore) FromCheckpoint(dir string, from int64) (int, error) {\n403\t\tvar wg sync.WaitGroup\n404\t\twork := make(chan [2]string, Keys.NumWorkers*4)\n405\t\tn, errs := int32(0), int32(0)\n406\t\n407\t\twg.Add(Keys.NumWorkers)\n408\t\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n409\t\t\tgo func() {\n410\t\t\t\tdefer wg.Done()\n411\t\t\t\tfor host := range work {\n412\t\t\t\t\tlvl := m.root.findLevelOrCreate(host[:], len(m.Metrics))\n413\t\t\t\t\tnn, err := lvl.fromCheckpoint(m, filepath.Join(dir, host[0], host[1]), from)\n414\t\t\t\t\tif err != nil {\n415\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while loading checkpoints for %s/%s: %s\", host[0], host[1], err.Error())\n416\t\t\t\t\t\tatomic.AddInt32(&errs, 1)\n417\t\t\t\t\t}\n418\t\t\t\t\tatomic.AddInt32(&n, int32(nn))\n419\t\t\t\t}\n420\t\t\t}()\n421\t\t}\n422\t\n423\t\terr := enqueueCheckpointHosts(dir, work)\n424\t\tclose(work)\n425\t\twg.Wait()\n426\t\n427\t\tif err != nil {\n428\t\t\treturn int(n), err\n429\t\t}\n430\t\n431\t\tif errs > 0 {\n432\t\t\treturn int(n), fmt.Errorf(\"[METRICSTORE]> %d errors happened while creating checkpoints (%d successes)\", errs, n)\n433\t\t}\n434\t\treturn int(n), nil\n435\t}\n436\t\n437\t// FromCheckpointFiles is the main entry point for loading checkpoints at startup.\n438\t//\n439\t// Creates checkpoint directory if it doesn't exist. This function must be called\n440\t// before any writes or reads, and can only be called once.\n441\tfunc (m *MemoryStore) FromCheckpointFiles(dir string, from int64) (int, error) {\n442\t\tif _, err := os.Stat(dir); os.IsNotExist(err) {\n443\t\t\terr := os.MkdirAll(dir, CheckpointDirPerms)\n444\t\t\tif err != nil {\n445\t\t\t\tcclog.Fatalf(\"[METRICSTORE]> Error creating directory: %#v\\n\", err)\n446\t\t\t}\n447\t\t\tcclog.Debugf(\"[METRICSTORE]> %#v Directory created successfully\", dir)\n448\t\t}\n449\t\n450\t\treturn m.FromCheckpoint(dir, from)\n451\t}\n452\t\n453\tfunc (l *Level) loadJSONFile(m *MemoryStore, f *os.File, from int64) error {\n454\t\tbr := bufio.NewReader(f)\n455\t\tcf := &CheckpointFile{}\n456\t\tif err := json.NewDecoder(br).Decode(cf); err != nil {\n457\t\t\treturn err\n458\t\t}\n459\t\n460\t\tif cf.To != 0 && cf.To < from {\n461\t\t\treturn nil\n462\t\t}\n463\t\n464\t\tif err := l.loadFile(cf, m); err != nil {\n465\t\t\treturn err\n466\t\t}\n467\t\n468\t\treturn nil\n469\t}\n470\t\n471\tfunc (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {\n472\t\tfor name, metric := range cf.Metrics {\n473\t\t\tn := len(metric.Data)\n474\t\t\tb := &buffer{\n475\t\t\t\tfrequency: metric.Frequency,\n476\t\t\t\tstart:     metric.Start,\n477\t\t\t\tdata:      metric.Data[0:n:n],\n478\t\t\t\tprev:      nil,\n479\t\t\t\tnext:      nil,\n480\t\t\t\tarchived:  true,\n481\t\t\t}\n482\t\n483\t\t\tminfo, ok := m.Metrics[name]\n484\t\t\tif !ok {\n485\t\t\t\tcontinue\n486\t\t\t}\n487\t\n488\t\t\tprev := l.metrics[minfo.offset]\n489\t\t\tif prev == nil {\n490\t\t\t\tl.metrics[minfo.offset] = b\n491\t\t\t} else {\n492\t\t\t\tif prev.start > b.start {\n493\t\t\t\t\treturn fmt.Errorf(\"[METRICSTORE]> buffer start time %d is before previous buffer start %d\", b.start, prev.start)\n494\t\t\t\t}\n495\t\n496\t\t\t\tb.prev = prev\n497\t\t\t\tprev.next = b\n498\t\t\t}\n499\t\t\tl.metrics[minfo.offset] = b\n500\t\t}\n501\t\n502\t\tif len(cf.Children) > 0 && l.children == nil {\n503\t\t\tl.children = make(map[string]*Level)\n504\t\t}\n505\t\n506\t\tfor sel, childCf := range cf.Children {\n507\t\t\tchild, ok := l.children[sel]\n508\t\t\tif !ok {\n509\t\t\t\tchild = &Level{\n510\t\t\t\t\tmetrics:  make([]*buffer, len(m.Metrics)),\n511\t\t\t\t\tchildren: nil,\n512\t\t\t\t}\n513\t\t\t\tl.children[sel] = child\n514\t\t\t}\n515\t\n516\t\t\tif err := child.loadFile(childCf, m); err != nil {\n517\t\t\t\treturn err\n518\t\t\t}\n519\t\t}\n520\t\n521\t\treturn nil\n522\t}\n523\t\n524\t// fromCheckpoint loads all checkpoint files (JSON, binary snapshot, WAL) for a\n525\t// single host directory. Snapshot files are loaded first (sorted by timestamp),\n526\t// then current.wal is replayed on top.\n527\tfunc (l *Level) fromCheckpoint(m *MemoryStore, dir string, from int64) (int, error) {\n528\t\tdirentries, err := os.ReadDir(dir)\n529\t\tif err != nil {\n530\t\t\tif os.IsNotExist(err) {\n531\t\t\t\treturn 0, nil\n532\t\t\t}\n533\t\t\treturn 0, err\n534\t\t}\n535\t\n536\t\tallFiles := make([]fs.DirEntry, 0)\n537\t\tvar walEntry fs.DirEntry\n538\t\tfilesLoaded := 0\n539\t\n540\t\tfor _, e := range direntries {\n541\t\t\tif e.IsDir() {\n542\t\t\t\t// Legacy: skip subdirectories (only used by old Avro format).\n543\t\t\t\t// These are ignored; their data is not loaded.\n544\t\t\t\tcclog.Debugf(\"[METRICSTORE]> skipping subdirectory %s in checkpoint dir %s\", e.Name(), dir)\n545\t\t\t\tcontinue\n546\t\t\t}\n547\t\n548\t\t\tname := e.Name()\n549\t\t\tif strings.HasSuffix(name, \".json\") || strings.HasSuffix(name, \".bin\") {\n550\t\t\t\tallFiles = append(allFiles, e)\n551\t\t\t} else if name == \"current.wal\" {\n552\t\t\t\twalEntry = e\n553\t\t\t}\n554\t\t\t// Silently ignore other files (e.g., .tmp, .bin.tmp from interrupted writes).\n555\t\t}\n556\t\n557\t\tfiles, err := findFiles(allFiles, from, true)\n558\t\tif err != nil {\n559\t\t\treturn filesLoaded, err\n560\t\t}\n561\t\n562\t\tloaders := map[string]func(*MemoryStore, *os.File, int64) error{\n563\t\t\t\".json\": l.loadJSONFile,\n564\t\t\t\".bin\":  l.loadBinaryFile,\n565\t\t}\n566\t\n567\t\tfor _, filename := range files {\n568\t\t\text := filepath.Ext(filename)\n569\t\t\tloader := loaders[ext]\n570\t\t\tif loader == nil {\n571\t\t\t\tcclog.Warnf(\"[METRICSTORE]> unknown extension for checkpoint file %s\", filename)\n572\t\t\t\tcontinue\n573\t\t\t}\n574\t\n575\t\t\terr := func() error {\n576\t\t\t\tf, err := os.Open(path.Join(dir, filename))\n577\t\t\t\tif err != nil {\n578\t\t\t\t\treturn err\n579\t\t\t\t}\n580\t\t\t\tdefer f.Close()\n581\t\t\t\treturn loader(m, f, from)\n582\t\t\t}()\n583\t\t\tif err != nil {\n584\t\t\t\treturn filesLoaded, err\n585\t\t\t}\n586\t\t\tfilesLoaded++\n587\t\t}\n588\t\n589\t\t// Replay WAL after all snapshot files so it fills in data since the last snapshot.\n590\t\tif walEntry != nil {\n591\t\t\terr := func() error {\n592\t\t\t\tf, err := os.Open(path.Join(dir, walEntry.Name()))\n593\t\t\t\tif err != nil {\n594\t\t\t\t\treturn err\n595\t\t\t\t}\n596\t\t\t\tdefer f.Close()\n597\t\t\t\treturn l.loadWALFile(m, f, from)\n598\t\t\t}()\n599\t\t\tif err != nil {\n600\t\t\t\t// WAL errors are non-fatal: the snapshot already loaded the bulk of data.\n601\t\t\t\tcclog.Warnf(\"[METRICSTORE]> WAL replay error for %s: %v (data since last snapshot may be missing)\", dir, err)\n602\t\t\t} else {\n603\t\t\t\tfilesLoaded++\n604\t\t\t}\n605\t\t}\n606\t\n607\t\treturn filesLoaded, nil\n608\t}\n609\t\n610\t// parseTimestampFromFilename extracts a Unix timestamp from a checkpoint filename.\n611\t// Supports \".json\" (format: \"<ts>.json\") and \".bin\" (format: \"<ts>.bin\").\n612\tfunc parseTimestampFromFilename(name string) (int64, error) {\n613\t\tswitch {\n614\t\tcase strings.HasSuffix(name, \".json\"):\n615\t\t\treturn strconv.ParseInt(name[:len(name)-5], 10, 64)\n616\t\tcase strings.HasSuffix(name, \".bin\"):\n617\t\t\treturn strconv.ParseInt(name[:len(name)-4], 10, 64)\n618\t\tdefault:\n619\t\t\treturn 0, fmt.Errorf(\"unknown checkpoint extension for file %q\", name)\n620\t\t}\n621\t}\n622\t\n623\t// findFiles returns filenames from direntries whose timestamps satisfy the filter.\n624\t// If findMoreRecentFiles is true, returns files with timestamps >= t (plus the\n625\t// last file before t if t falls between two files).\n626\tfunc findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {\n627\t\tnums := map[string]int64{}\n628\t\tfor _, e := range direntries {\n629\t\t\tname := e.Name()\n630\t\t\tif !strings.HasSuffix(name, \".json\") && !strings.HasSuffix(name, \".bin\") {\n631\t\t\t\tcontinue\n632\t\t\t}\n633\t\n634\t\t\tts, err := parseTimestampFromFilename(name)\n635\t\t\tif err != nil {\n636\t\t\t\treturn nil, err\n637\t\t\t}\n638\t\t\tnums[name] = ts\n639\t\t}\n640\t\n641\t\tsort.Slice(direntries, func(i, j int) bool {\n642\t\t\ta, b := direntries[i], direntries[j]\n643\t\t\treturn nums[a.Name()] < nums[b.Name()]\n644\t\t})\n645\t\n646\t\tif len(nums) == 0 {\n647\t\t\treturn nil, nil\n648\t\t}\n649\t\n650\t\tfilenames := make([]string, 0)\n651\t\n652\t\tfor i, e := range direntries {\n653\t\t\tts1 := nums[e.Name()]\n654\t\n655\t\t\tif findMoreRecentFiles && t <= ts1 {\n656\t\t\t\tfilenames = append(filenames, e.Name())\n657\t\t\t} else if !findMoreRecentFiles && ts1 <= t && ts1 != 0 {\n658\t\t\t\tfilenames = append(filenames, e.Name())\n659\t\t\t}\n660\t\n661\t\t\tif i == len(direntries)-1 {\n662\t\t\t\tcontinue\n663\t\t\t}\n664\t\n665\t\t\tenext := direntries[i+1]\n666\t\t\tts2 := nums[enext.Name()]\n667\t\n668\t\t\tif findMoreRecentFiles {\n669\t\t\t\tif ts1 < t && t < ts2 {\n670\t\t\t\t\tfilenames = append(filenames, e.Name())\n671\t\t\t\t}\n672\t\t\t}\n673\t\t}\n674\t\n675\t\treturn filenames, nil\n676\t}\n677\t"}]},"uuid":"f7e2d65e-5998-418b-9d7b-62d1567c2ae4","timestamp":"2026-06-05T06:32:31.910Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/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// The checkpoint interval is read from Keys.CheckpointInterval (default: 12 hours).\n//\n// Format behaviour:\n//   - \"json\": Writes a JSON snapshot file per host every interval\n//   - \"wal\":  Writes a binary snapshot file per host every interval, then rotates\n//     the current.wal files for all successfully checkpointed hosts\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\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\t// Pause WAL writes: the binary snapshot captures all in-memory\n\t\t\t\t\t// data, so WAL records written during checkpoint are redundant\n\t\t\t\t\t// and would be deleted during rotation anyway.\n\t\t\t\t\twalCheckpointActive.Store(true)\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}\n\t\t\t\t\tif n > 0 {\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\twalCheckpointActive.Store(false)\n\t\t\t\t\twalDropped.Store(0)\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: \"<ts>.json\") and \".bin\" (format: \"<ts>.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","numLines":677,"startLine":1,"totalLines":677}},"sourceToolAssistantUUID":"6afe5f5f-c5bc-4a02-8adb-37d83aeb078b","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
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+{"type":"ai-title","aiTitle":"Analyze WAL file reset mechanism in checkpoint system","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63"}
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+{"parentUuid":"3c6b71b5-d8b6-4661-9c49-083966474dee","isSidechain":false,"promptId":"bf1a2a8c-5f1a-4688-91c9-f9d2413ee03d","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_019atYppGJMYTsbWnJWBfvEV","type":"tool_result","content":"1\t// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n2\t// All rights reserved. This file is part of cc-backend.\n3\t// Use of this source code is governed by a MIT-style\n4\t// license that can be found in the LICENSE file.\n5\t\n6\t// Package metricstore provides walCheckpoint.go: WAL-based checkpoint implementation.\n7\t//\n8\t// This replaces the Avro shadow tree with an append-only Write-Ahead Log (WAL)\n9\t// per host, eliminating the extra memory overhead of the AvroStore and providing\n10\t// truly continuous (per-write) crash safety.\n11\t//\n12\t// # Architecture\n13\t//\n14\t//\tMetric write (DecodeLine)\n15\t//\t      │\n16\t//\t      ├─► WriteToLevel()    → main MemoryStore (unchanged)\n17\t//\t      │\n18\t//\t      └─► WALMessages channel\n19\t//\t               │\n20\t//\t               ▼\n21\t//\t        WALStaging goroutine\n22\t//\t               │\n23\t//\t               ▼\n24\t//\t        checkpoints/cluster/host/current.wal  (append-only, binary)\n25\t//\n26\t//\tPeriodic checkpoint (Checkpointing goroutine):\n27\t//\t  1. Write <timestamp>.bin snapshot (column-oriented, from main tree)\n28\t//\t  2. Signal WALStaging to truncate current.wal per host\n29\t//\n30\t//\tOn restart (FromCheckpoint):\n31\t//\t  1. Load most recent <timestamp>.bin snapshot\n32\t//\t  2. Replay current.wal (overwrite-safe: buffer.write handles duplicate timestamps)\n33\t//\n34\t// # WAL Record Format\n35\t//\n36\t//\t[4B magic 0xCC1DA7A1][4B payload_len][payload][4B CRC32]\n37\t//\n38\t//\tpayload:\n39\t//\t  [8B timestamp int64]\n40\t//\t  [2B metric_name_len uint16][N metric name bytes]\n41\t//\t  [1B selector_count uint8]\n42\t//\t  per selector: [1B selector_len uint8][M selector bytes]\n43\t//\t  [4B value float32 bits]\n44\t//\n45\t// # Binary Snapshot Format\n46\t//\n47\t//\t[4B magic 0xCC5B0001][8B from int64][8B to int64]\n48\t//\tLevel tree (recursive):\n49\t//\t  [4B num_metrics uint32]\n50\t//\t  per metric:\n51\t//\t    [2B name_len uint16][N name bytes]\n52\t//\t    [8B frequency int64][8B start int64]\n53\t//\t    [4B num_values uint32][num_values × 4B float32]\n54\t//\t  [4B num_children uint32]\n55\t//\t  per child: [2B name_len uint16][N name bytes] + Level (recursive)\n56\tpackage metricstore\n57\t\n58\timport (\n59\t\t\"bufio\"\n60\t\t\"context\"\n61\t\t\"encoding/binary\"\n62\t\t\"fmt\"\n63\t\t\"hash/crc32\"\n64\t\t\"hash/fnv\"\n65\t\t\"io\"\n66\t\t\"math\"\n67\t\t\"os\"\n68\t\t\"path\"\n69\t\t\"strings\"\n70\t\t\"sync\"\n71\t\t\"sync/atomic\"\n72\t\t\"time\"\n73\t\n74\t\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n75\t\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n76\t)\n77\t\n78\t// Magic numbers for binary formats.\n79\tconst (\n80\t\twalFileMagic   = uint32(0xCC1DA701) // WAL file header magic\n81\t\twalRecordMagic = uint32(0xCC1DA7A1) // WAL record magic\n82\t\tsnapFileMagic  = uint32(0xCC5B0001) // Binary snapshot magic\n83\t)\n84\t\n85\t// walShardChs holds per-shard channels for WAL messages.\n86\t// Initialized by WALStaging; nil when WAL is not active.\n87\tvar walShardChs []chan *WALMessage\n88\t\n89\t// walShardRotateChs holds per-shard channels for WAL rotation requests.\n90\tvar walShardRotateChs []chan walRotateReq\n91\t\n92\t// walNumShards stores the number of shards (set during WALStaging init).\n93\tvar walNumShards int\n94\t\n95\t// walStagingWg tracks WALStaging goroutine exits for shutdown synchronization.\n96\tvar walStagingWg sync.WaitGroup\n97\t\n98\t// walShuttingDown is set before closing shard channels to prevent\n99\t// SendWALMessage from sending on a closed channel (which panics in Go).\n100\tvar walShuttingDown atomic.Bool\n101\t\n102\t// walCheckpointActive is set during binary checkpoint writes.\n103\t// While active, SendWALMessage skips sending (returns true) because the\n104\t// snapshot captures all in-memory data, making WAL writes redundant.\n105\tvar walCheckpointActive atomic.Bool\n106\t\n107\t// WALMessage represents a single metric write to be appended to the WAL.\n108\t// Cluster and Node are NOT stored in the WAL record (inferred from file path).\n109\ttype WALMessage struct {\n110\t\tMetricName string\n111\t\tCluster    string\n112\t\tNode       string\n113\t\tSelector   []string\n114\t\tValue      schema.Float\n115\t\tTimestamp  int64\n116\t}\n117\t\n118\t// walRotateReq requests WAL file rotation for a specific host directory.\n119\t// The done channel is closed by the WAL goroutine when rotation is complete.\n120\ttype walRotateReq struct {\n121\t\thostDir string\n122\t\tdone    chan struct{}\n123\t}\n124\t\n125\t// walFileState holds an open WAL file handle and buffered writer for one host directory.\n126\ttype walFileState struct {\n127\t\tf     *os.File\n128\t\tw     *bufio.Writer\n129\t\tdirty bool\n130\t\tsize  int64 // approximate bytes written (tracked from open + writes)\n131\t}\n132\t\n133\t// walFlushInterval controls how often dirty WAL files are flushed to disk.\n134\t// Decoupling flushes from message processing lets the consumer run at memory\n135\t// speed, amortizing syscall overhead across many writes.\n136\tconst walFlushInterval = 1 * time.Second\n137\t\n138\t// walShardIndex computes which shard a message belongs to based on cluster+node.\n139\t// Uses FNV-1a hash for fast, well-distributed mapping.\n140\tfunc walShardIndex(cluster, node string) int {\n141\t\th := fnv.New32a()\n142\t\th.Write([]byte(cluster))\n143\t\th.Write([]byte{0})\n144\t\th.Write([]byte(node))\n145\t\treturn int(h.Sum32()) % walNumShards\n146\t}\n147\t\n148\t// SendWALMessage routes a WAL message to the appropriate shard channel.\n149\t// Returns false if the channel is full or shutdown is in progress.\n150\tfunc SendWALMessage(msg *WALMessage) bool {\n151\t\tif walShardChs == nil || walShuttingDown.Load() {\n152\t\t\treturn false\n153\t\t}\n154\t\tif walCheckpointActive.Load() {\n155\t\t\treturn true // Data safe in memory; snapshot will capture it\n156\t\t}\n157\t\tshard := walShardIndex(msg.Cluster, msg.Node)\n158\t\tselect {\n159\t\tcase walShardChs[shard] <- msg:\n160\t\t\treturn true\n161\t\tdefault:\n162\t\t\treturn false\n163\t\t}\n164\t}\n165\t\n166\t// WALStaging starts N sharded background goroutines that receive WALMessage items\n167\t// and append binary WAL records to per-host current.wal files.\n168\t// Each shard owns a subset of hosts (determined by hash of cluster+node),\n169\t// parallelizing serialization and I/O while keeping per-host writes serial.\n170\tfunc WALStaging(wg *sync.WaitGroup, ctx context.Context) {\n171\t\tif Keys.Checkpoints.FileFormat == \"json\" {\n172\t\t\treturn\n173\t\t}\n174\t\n175\t\twalNumShards = max(Keys.NumWorkers, 1)\n176\t\tchBufSize := max(65536/walNumShards, 1024)\n177\t\n178\t\twalShardChs = make([]chan *WALMessage, walNumShards)\n179\t\twalShardRotateChs = make([]chan walRotateReq, walNumShards)\n180\t\n181\t\tfor i := range walNumShards {\n182\t\t\twalShardChs[i] = make(chan *WALMessage, chBufSize)\n183\t\t\twalShardRotateChs[i] = make(chan walRotateReq, 64)\n184\t\t}\n185\t\n186\t\tfor i := range walNumShards {\n187\t\t\tmsgCh := walShardChs[i]\n188\t\t\trotateCh := walShardRotateChs[i]\n189\t\n190\t\t\twalStagingWg.Add(1)\n191\t\t\twg.Go(func() {\n192\t\t\t\tdefer walStagingWg.Done()\n193\t\t\t\thostFiles := make(map[string]*walFileState)\n194\t\n195\t\t\t\tdefer func() {\n196\t\t\t\t\tfor _, ws := range hostFiles {\n197\t\t\t\t\t\tif ws.f != nil {\n198\t\t\t\t\t\t\tws.w.Flush()\n199\t\t\t\t\t\t\tws.f.Close()\n200\t\t\t\t\t\t}\n201\t\t\t\t\t}\n202\t\t\t\t}()\n203\t\n204\t\t\t\tgetOrOpenWAL := func(hostDir string) *walFileState {\n205\t\t\t\t\tws, ok := hostFiles[hostDir]\n206\t\t\t\t\tif ok {\n207\t\t\t\t\t\treturn ws\n208\t\t\t\t\t}\n209\t\n210\t\t\t\t\tif err := os.MkdirAll(hostDir, CheckpointDirPerms); err != nil {\n211\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: mkdir %s: %v\", hostDir, err)\n212\t\t\t\t\t\treturn nil\n213\t\t\t\t\t}\n214\t\n215\t\t\t\t\twalPath := path.Join(hostDir, \"current.wal\")\n216\t\t\t\t\tf, err := os.OpenFile(walPath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, CheckpointFilePerms)\n217\t\t\t\t\tif err != nil {\n218\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: open %s: %v\", walPath, err)\n219\t\t\t\t\t\treturn nil\n220\t\t\t\t\t}\n221\t\n222\t\t\t\t\tw := bufio.NewWriter(f)\n223\t\n224\t\t\t\t\t// Write file header magic if file is new (empty).\n225\t\t\t\t\tinfo, err := f.Stat()\n226\t\t\t\t\tvar fileSize int64\n227\t\t\t\t\tif err == nil {\n228\t\t\t\t\t\tfileSize = info.Size()\n229\t\t\t\t\t}\n230\t\t\t\t\tif err == nil && fileSize == 0 {\n231\t\t\t\t\t\tvar hdr [4]byte\n232\t\t\t\t\t\tbinary.LittleEndian.PutUint32(hdr[:], walFileMagic)\n233\t\t\t\t\t\tif _, err := w.Write(hdr[:]); err != nil {\n234\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: write header %s: %v\", walPath, err)\n235\t\t\t\t\t\t\tf.Close()\n236\t\t\t\t\t\t\treturn nil\n237\t\t\t\t\t\t}\n238\t\t\t\t\t\tfileSize = 4\n239\t\t\t\t\t}\n240\t\n241\t\t\t\t\tws = &walFileState{f: f, w: w, size: fileSize}\n242\t\t\t\t\thostFiles[hostDir] = ws\n243\t\t\t\t\treturn ws\n244\t\t\t\t}\n245\t\n246\t\t\t\tprocessMsg := func(msg *WALMessage) {\n247\t\t\t\t\thostDir := path.Join(Keys.Checkpoints.RootDir, msg.Cluster, msg.Node)\n248\t\t\t\t\tws := getOrOpenWAL(hostDir)\n249\t\t\t\t\tif ws == nil {\n250\t\t\t\t\t\treturn\n251\t\t\t\t\t}\n252\t\n253\t\t\t\t\t// Enforce max WAL size: force-rotate before writing if limit is exceeded.\n254\t\t\t\t\t// The in-memory store still holds the data; only crash-recovery coverage is lost.\n255\t\t\t\t\tif maxSize := Keys.Checkpoints.MaxWALSize; maxSize > 0 && ws.size >= maxSize {\n256\t\t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> WAL: force-rotating %s (size %d >= limit %d)\",\n257\t\t\t\t\t\t\thostDir, ws.size, maxSize)\n258\t\t\t\t\t\tws.w.Flush()\n259\t\t\t\t\t\tws.f.Close()\n260\t\t\t\t\t\twalPath := path.Join(hostDir, \"current.wal\")\n261\t\t\t\t\t\tif err := os.Remove(walPath); err != nil && !os.IsNotExist(err) {\n262\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: remove %s: %v\", walPath, err)\n263\t\t\t\t\t\t}\n264\t\t\t\t\t\tdelete(hostFiles, hostDir)\n265\t\t\t\t\t\tws = getOrOpenWAL(hostDir)\n266\t\t\t\t\t\tif ws == nil {\n267\t\t\t\t\t\t\treturn\n268\t\t\t\t\t\t}\n269\t\t\t\t\t}\n270\t\n271\t\t\t\t\tn, err := writeWALRecordDirect(ws.w, msg)\n272\t\t\t\t\tif err != nil {\n273\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: write record: %v\", err)\n274\t\t\t\t\t}\n275\t\t\t\t\tws.size += int64(n)\n276\t\t\t\t\tws.dirty = true\n277\t\t\t\t}\n278\t\n279\t\t\t\tprocessRotate := func(req walRotateReq) {\n280\t\t\t\t\tws, ok := hostFiles[req.hostDir]\n281\t\t\t\t\tif ok && ws.f != nil {\n282\t\t\t\t\t\tws.w.Flush()\n283\t\t\t\t\t\tws.f.Close()\n284\t\t\t\t\t\twalPath := path.Join(req.hostDir, \"current.wal\")\n285\t\t\t\t\t\tif err := os.Remove(walPath); err != nil && !os.IsNotExist(err) {\n286\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: remove %s: %v\", walPath, err)\n287\t\t\t\t\t\t}\n288\t\t\t\t\t\tdelete(hostFiles, req.hostDir)\n289\t\t\t\t\t}\n290\t\t\t\t\tclose(req.done)\n291\t\t\t\t}\n292\t\n293\t\t\t\tflushDirty := func() {\n294\t\t\t\t\tfor _, ws := range hostFiles {\n295\t\t\t\t\t\tif ws.dirty {\n296\t\t\t\t\t\t\tws.w.Flush()\n297\t\t\t\t\t\t\tws.dirty = false\n298\t\t\t\t\t\t}\n299\t\t\t\t\t}\n300\t\t\t\t}\n301\t\n302\t\t\t\tticker := time.NewTicker(walFlushInterval)\n303\t\t\t\tdefer ticker.Stop()\n304\t\n305\t\t\t\t// drainBatch processes up to 4096 pending messages without blocking.\n306\t\t\t\t// Returns false if the channel was closed.\n307\t\t\t\tdrainBatch := func() bool {\n308\t\t\t\t\tfor range 4096 {\n309\t\t\t\t\t\tselect {\n310\t\t\t\t\t\tcase msg, ok := <-msgCh:\n311\t\t\t\t\t\t\tif !ok {\n312\t\t\t\t\t\t\t\tflushDirty()\n313\t\t\t\t\t\t\t\treturn false\n314\t\t\t\t\t\t\t}\n315\t\t\t\t\t\t\tprocessMsg(msg)\n316\t\t\t\t\t\tcase req := <-rotateCh:\n317\t\t\t\t\t\t\tprocessRotate(req)\n318\t\t\t\t\t\tdefault:\n319\t\t\t\t\t\t\treturn true\n320\t\t\t\t\t\t}\n321\t\t\t\t\t}\n322\t\t\t\t\treturn true\n323\t\t\t\t}\n324\t\n325\t\t\t\tfor {\n326\t\t\t\t\tselect {\n327\t\t\t\t\tcase <-ctx.Done():\n328\t\t\t\t\t\t// On shutdown, skip draining buffered messages — a full binary\n329\t\t\t\t\t\t// checkpoint will be written from in-memory state, making\n330\t\t\t\t\t\t// buffered WAL records redundant.\n331\t\t\t\t\t\tflushDirty()\n332\t\t\t\t\t\treturn\n333\t\t\t\t\tcase msg, ok := <-msgCh:\n334\t\t\t\t\t\tif !ok {\n335\t\t\t\t\t\t\treturn\n336\t\t\t\t\t\t}\n337\t\t\t\t\t\tprocessMsg(msg)\n338\t\t\t\t\t\tif !drainBatch() {\n339\t\t\t\t\t\t\treturn\n340\t\t\t\t\t\t}\n341\t\t\t\t\t\t// No flush here — timer handles periodic flushing.\n342\t\t\t\t\tcase <-ticker.C:\n343\t\t\t\t\t\tflushDirty()\n344\t\t\t\t\tcase req := <-rotateCh:\n345\t\t\t\t\t\tprocessRotate(req)\n346\t\t\t\t\t}\n347\t\t\t\t}\n348\t\t\t})\n349\t\t}\n350\t}\n351\t\n352\t// WaitForWALStagingDrain blocks until all WALStaging goroutines have exited.\n353\t// Must be called after closing walShardChs to ensure all file handles are\n354\t// flushed and closed before checkpoint writes begin.\n355\tfunc WaitForWALStagingDrain() {\n356\t\twalStagingWg.Wait()\n357\t}\n358\t\n359\t// RotateWALFiles sends rotation requests for the given host directories\n360\t// and blocks until all rotations complete. Each request is routed to the\n361\t// shard that owns the host directory.\n362\t//\n363\t// If shutdown is in progress (WAL staging goroutines may have exited),\n364\t// rotation is skipped to avoid deadlocking on abandoned channels.\n365\tfunc RotateWALFiles(hostDirs []string) {\n366\t\tif walShardRotateChs == nil || walShuttingDown.Load() {\n367\t\t\treturn\n368\t\t}\n369\t\tdeadline := time.After(2 * time.Minute)\n370\t\tdones := make([]chan struct{}, 0, len(hostDirs))\n371\t\tfor _, dir := range hostDirs {\n372\t\t\tdone := make(chan struct{})\n373\t\t\tshard := walShardIndexFromDir(dir)\n374\t\t\tselect {\n375\t\t\tcase walShardRotateChs[shard] <- walRotateReq{hostDir: dir, done: done}:\n376\t\t\t\tdones = append(dones, done)\n377\t\t\tcase <-deadline:\n378\t\t\t\tcclog.Warnf(\"[METRICSTORE]> WAL rotation send timed out, %d of %d hosts remaining\",\n379\t\t\t\t\tlen(hostDirs)-len(dones), len(hostDirs))\n380\t\t\t\tgoto waitDones\n381\t\t\t}\n382\t\t}\n383\twaitDones:\n384\t\tfor _, done := range dones {\n385\t\t\tselect {\n386\t\t\tcase <-done:\n387\t\t\tcase <-time.After(30 * time.Second):\n388\t\t\t\tcclog.Warn(\"[METRICSTORE]> WAL rotation completion timed out, continuing\")\n389\t\t\t\treturn\n390\t\t\t}\n391\t\t}\n392\t}\n393\t\n394\t// walShardIndexFromDir extracts cluster and node from a host directory path\n395\t// and returns the shard index. The path format is: rootDir/cluster/node\n396\tfunc walShardIndexFromDir(hostDir string) int {\n397\t\t// hostDir = .../cluster/node — extract last two path components\n398\t\tnode := path.Base(hostDir)\n399\t\tcluster := path.Base(path.Dir(hostDir))\n400\t\treturn walShardIndex(cluster, node)\n401\t}\n402\t\n403\t// RotateWALFilesAfterShutdown directly removes current.wal files for the given\n404\t// host directories. Used after shutdown, when WALStaging goroutines have already\n405\t// exited and the channel-based RotateWALFiles is no longer safe to call.\n406\tfunc RotateWALFilesAfterShutdown(hostDirs []string) {\n407\t\tfor _, dir := range hostDirs {\n408\t\t\twalPath := path.Join(dir, \"current.wal\")\n409\t\t\tif err := os.Remove(walPath); err != nil && !os.IsNotExist(err) {\n410\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: remove %s: %v\", walPath, err)\n411\t\t\t}\n412\t\t}\n413\t}\n414\t\n415\t// writeWALRecordDirect encodes a WAL record into a contiguous buffer first,\n416\t// then writes it to the bufio.Writer in a single call. This prevents partial\n417\t// records in the write buffer if a write error occurs mid-record (e.g. disk full).\n418\t// Returns the number of bytes written and any error.\n419\tfunc writeWALRecordDirect(w *bufio.Writer, msg *WALMessage) (int, error) {\n420\t\t// Compute payload and total record size.\n421\t\tpayloadSize := 8 + 2 + len(msg.MetricName) + 1 + 4\n422\t\tfor _, s := range msg.Selector {\n423\t\t\tpayloadSize += 1 + len(s)\n424\t\t}\n425\t\t// Total: 8 (header) + payload + 4 (CRC).\n426\t\ttotalSize := 8 + payloadSize + 4\n427\t\n428\t\t// Use stack buffer for typical small records, heap-allocate only for large ones.\n429\t\tvar stackBuf [256]byte\n430\t\tvar buf []byte\n431\t\tif totalSize <= len(stackBuf) {\n432\t\t\tbuf = stackBuf[:totalSize]\n433\t\t} else {\n434\t\t\tbuf = make([]byte, totalSize)\n435\t\t}\n436\t\n437\t\t// Header: magic + payload length.\n438\t\tbinary.LittleEndian.PutUint32(buf[0:4], walRecordMagic)\n439\t\tbinary.LittleEndian.PutUint32(buf[4:8], uint32(payloadSize))\n440\t\n441\t\t// Payload starts at offset 8.\n442\t\tp := 8\n443\t\n444\t\t// Timestamp (8 bytes).\n445\t\tbinary.LittleEndian.PutUint64(buf[p:p+8], uint64(msg.Timestamp))\n446\t\tp += 8\n447\t\n448\t\t// Metric name length (2 bytes) + metric name.\n449\t\tbinary.LittleEndian.PutUint16(buf[p:p+2], uint16(len(msg.MetricName)))\n450\t\tp += 2\n451\t\tp += copy(buf[p:], msg.MetricName)\n452\t\n453\t\t// Selector count (1 byte).\n454\t\tbuf[p] = byte(len(msg.Selector))\n455\t\tp++\n456\t\n457\t\t// Selectors (1-byte length + bytes each).\n458\t\tfor _, sel := range msg.Selector {\n459\t\t\tbuf[p] = byte(len(sel))\n460\t\t\tp++\n461\t\t\tp += copy(buf[p:], sel)\n462\t\t}\n463\t\n464\t\t// Value (4 bytes, float32 bits).\n465\t\tbinary.LittleEndian.PutUint32(buf[p:p+4], math.Float32bits(float32(msg.Value)))\n466\t\tp += 4\n467\t\n468\t\t// CRC32 over payload (bytes 8..8+payloadSize).\n469\t\tcrc := crc32.ChecksumIEEE(buf[8 : 8+payloadSize])\n470\t\tbinary.LittleEndian.PutUint32(buf[p:p+4], crc)\n471\t\n472\t\t// Single atomic write to the buffered writer.\n473\t\tn, err := w.Write(buf)\n474\t\treturn n, err\n475\t}\n476\t\n477\t// readWALRecord reads one WAL record from the reader.\n478\t// Returns (nil, nil) on clean EOF. Returns error on data corruption.\n479\t// A CRC mismatch indicates a truncated trailing record (expected on crash).\n480\tfunc readWALRecord(r io.Reader) (*WALMessage, error) {\n481\t\tvar magic uint32\n482\t\tif err := binary.Read(r, binary.LittleEndian, &magic); err != nil {\n483\t\t\tif err == io.EOF {\n484\t\t\t\treturn nil, nil // Clean EOF\n485\t\t\t}\n486\t\t\treturn nil, fmt.Errorf(\"read record magic: %w\", err)\n487\t\t}\n488\t\n489\t\tif magic != walRecordMagic {\n490\t\t\treturn nil, fmt.Errorf(\"invalid record magic 0x%08X (expected 0x%08X)\", magic, walRecordMagic)\n491\t\t}\n492\t\n493\t\tvar payloadLen uint32\n494\t\tif err := binary.Read(r, binary.LittleEndian, &payloadLen); err != nil {\n495\t\t\treturn nil, fmt.Errorf(\"read payload length: %w\", err)\n496\t\t}\n497\t\n498\t\tif payloadLen > 1<<20 { // 1 MB sanity limit\n499\t\t\treturn nil, fmt.Errorf(\"record payload too large: %d bytes\", payloadLen)\n500\t\t}\n501\t\n502\t\tpayload := make([]byte, payloadLen)\n503\t\tif _, err := io.ReadFull(r, payload); err != nil {\n504\t\t\treturn nil, fmt.Errorf(\"read payload: %w\", err)\n505\t\t}\n506\t\n507\t\tvar storedCRC uint32\n508\t\tif err := binary.Read(r, binary.LittleEndian, &storedCRC); err != nil {\n509\t\t\treturn nil, fmt.Errorf(\"read CRC: %w\", err)\n510\t\t}\n511\t\n512\t\tif crc32.ChecksumIEEE(payload) != storedCRC {\n513\t\t\treturn nil, fmt.Errorf(\"CRC mismatch (truncated write or corruption)\")\n514\t\t}\n515\t\n516\t\treturn parseWALPayload(payload)\n517\t}\n518\t\n519\t// parseWALPayload decodes a binary payload into a WALMessage.\n520\tfunc parseWALPayload(payload []byte) (*WALMessage, error) {\n521\t\tif len(payload) < 8+2+1+4 {\n522\t\t\treturn nil, fmt.Errorf(\"payload too short: %d bytes\", len(payload))\n523\t\t}\n524\t\n525\t\toffset := 0\n526\t\n527\t\t// Timestamp (8 bytes)\n528\t\tts := int64(binary.LittleEndian.Uint64(payload[offset : offset+8]))\n529\t\toffset += 8\n530\t\n531\t\t// Metric name (2-byte length + bytes)\n532\t\tif offset+2 > len(payload) {\n533\t\t\treturn nil, fmt.Errorf(\"metric name length overflows payload\")\n534\t\t}\n535\t\tmLen := int(binary.LittleEndian.Uint16(payload[offset : offset+2]))\n536\t\toffset += 2\n537\t\n538\t\tif offset+mLen > len(payload) {\n539\t\t\treturn nil, fmt.Errorf(\"metric name overflows payload\")\n540\t\t}\n541\t\tmetricName := string(payload[offset : offset+mLen])\n542\t\toffset += mLen\n543\t\n544\t\t// Selector count (1 byte)\n545\t\tif offset >= len(payload) {\n546\t\t\treturn nil, fmt.Errorf(\"selector count overflows payload\")\n547\t\t}\n548\t\tselCount := int(payload[offset])\n549\t\toffset++\n550\t\n551\t\tselectors := make([]string, selCount)\n552\t\tfor i := range selCount {\n553\t\t\tif offset >= len(payload) {\n554\t\t\t\treturn nil, fmt.Errorf(\"selector[%d] length overflows payload\", i)\n555\t\t\t}\n556\t\t\tsLen := int(payload[offset])\n557\t\t\toffset++\n558\t\n559\t\t\tif offset+sLen > len(payload) {\n560\t\t\t\treturn nil, fmt.Errorf(\"selector[%d] data overflows payload\", i)\n561\t\t\t}\n562\t\t\tselectors[i] = string(payload[offset : offset+sLen])\n563\t\t\toffset += sLen\n564\t\t}\n565\t\n566\t\t// Value (4 bytes, float32 bits)\n567\t\tif offset+4 > len(payload) {\n568\t\t\treturn nil, fmt.Errorf(\"value overflows payload\")\n569\t\t}\n570\t\tbits := binary.LittleEndian.Uint32(payload[offset : offset+4])\n571\t\tvalue := schema.Float(math.Float32frombits(bits))\n572\t\n573\t\treturn &WALMessage{\n574\t\t\tMetricName: metricName,\n575\t\t\tTimestamp:  ts,\n576\t\t\tSelector:   selectors,\n577\t\t\tValue:      value,\n578\t\t}, nil\n579\t}\n580\t\n581\t// loadWALFile reads a WAL file and replays all valid records into the Level tree.\n582\t// l is the host-level node. Corrupt or partial trailing records are silently skipped\n583\t// (expected on crash). Records older than 'from' are skipped.\n584\tfunc (l *Level) loadWALFile(m *MemoryStore, f *os.File, from int64) error {\n585\t\tbr := bufio.NewReader(f)\n586\t\n587\t\t// Verify file header magic.\n588\t\tvar fileMagic uint32\n589\t\tif err := binary.Read(br, binary.LittleEndian, &fileMagic); err != nil {\n590\t\t\tif err == io.EOF {\n591\t\t\t\treturn nil // Empty file, no data\n592\t\t\t}\n593\t\t\treturn fmt.Errorf(\"[METRICSTORE]> WAL: read file header: %w\", err)\n594\t\t}\n595\t\n596\t\tif fileMagic != walFileMagic {\n597\t\t\treturn fmt.Errorf(\"[METRICSTORE]> WAL: invalid file magic 0x%08X (expected 0x%08X)\", fileMagic, walFileMagic)\n598\t\t}\n599\t\n600\t\t// Cache level lookups to avoid repeated tree traversal.\n601\t\tlvlCache := make(map[string]*Level)\n602\t\n603\t\tfor {\n604\t\t\tmsg, err := readWALRecord(br)\n605\t\t\tif err != nil {\n606\t\t\t\t// Truncated trailing record is expected after a crash; stop replaying.\n607\t\t\t\tcclog.Debugf(\"[METRICSTORE]> WAL: stopping replay at corrupted/partial record: %v\", err)\n608\t\t\t\tbreak\n609\t\t\t}\n610\t\t\tif msg == nil {\n611\t\t\t\tbreak // Clean EOF\n612\t\t\t}\n613\t\n614\t\t\tif msg.Timestamp < from {\n615\t\t\t\tcontinue // Older than retention window\n616\t\t\t}\n617\t\n618\t\t\tminfo, ok := m.Metrics[msg.MetricName]\n619\t\t\tif !ok {\n620\t\t\t\tcontinue // Unknown metric (config may have changed)\n621\t\t\t}\n622\t\n623\t\t\t// Cache key is the null-separated selector path.\n624\t\t\tcacheKey := joinSelector(msg.Selector)\n625\t\t\tlvl, ok := lvlCache[cacheKey]\n626\t\t\tif !ok {\n627\t\t\t\tlvl = l.findLevelOrCreate(msg.Selector, len(m.Metrics))\n628\t\t\t\tlvlCache[cacheKey] = lvl\n629\t\t\t}\n630\t\n631\t\t\t// Write directly to the buffer, same as WriteToLevel but without the\n632\t\t\t// global level lookup (we already have the right level).\n633\t\t\tlvl.lock.Lock()\n634\t\t\tb := lvl.metrics[minfo.offset]\n635\t\t\tif b == nil {\n636\t\t\t\tb = newBuffer(msg.Timestamp, minfo.Frequency)\n637\t\t\t\tlvl.metrics[minfo.offset] = b\n638\t\t\t}\n639\t\t\tnb, writeErr := b.write(msg.Timestamp, msg.Value)\n640\t\t\tif writeErr == nil && b != nb {\n641\t\t\t\tlvl.metrics[minfo.offset] = nb\n642\t\t\t}\n643\t\t\t// Ignore write errors for timestamps before buffer start (can happen when\n644\t\t\t// replaying WAL entries that predate a loaded snapshot's start time).\n645\t\t\tlvl.lock.Unlock()\n646\t\t}\n647\t\n648\t\treturn nil\n649\t}\n650\t\n651\t// joinSelector builds a cache key from a selector slice using null bytes as separators.\n652\tfunc joinSelector(sel []string) string {\n653\t\tif len(sel) == 0 {\n654\t\t\treturn \"\"\n655\t\t}\n656\t\tvar result strings.Builder\n657\t\tresult.WriteString(sel[0])\n658\t\tfor i := 1; i < len(sel); i++ {\n659\t\t\tresult.WriteString(\"\\x00\" + sel[i])\n660\t\t}\n661\t\treturn result.String()\n662\t}\n663\t\n664\t// ToCheckpointWAL writes binary snapshot files for all hosts in parallel.\n665\t// Returns the number of files written, the list of host directories that were\n666\t// successfully checkpointed (for WAL rotation), and any errors.\n667\tfunc (m *MemoryStore) ToCheckpointWAL(dir string, from, to int64) (int, []string, error) {\n668\t\t// Collect all cluster/host pairs.\n669\t\tm.root.lock.RLock()\n670\t\ttotalHosts := 0\n671\t\tfor _, l1 := range m.root.children {\n672\t\t\tl1.lock.RLock()\n673\t\t\ttotalHosts += len(l1.children)\n674\t\t\tl1.lock.RUnlock()\n675\t\t}\n676\t\tm.root.lock.RUnlock()\n677\t\n678\t\tlevels := make([]*Level, 0, totalHosts)\n679\t\tselectors := make([][]string, 0, totalHosts)\n680\t\n681\t\tm.root.lock.RLock()\n682\t\tfor sel1, l1 := range m.root.children {\n683\t\t\tl1.lock.RLock()\n684\t\t\tfor sel2, l2 := range l1.children {\n685\t\t\t\tlevels = append(levels, l2)\n686\t\t\t\tselectors = append(selectors, []string{sel1, sel2})\n687\t\t\t}\n688\t\t\tl1.lock.RUnlock()\n689\t\t}\n690\t\tm.root.lock.RUnlock()\n691\t\n692\t\ttype workItem struct {\n693\t\t\tlevel    *Level\n694\t\t\thostDir  string\n695\t\t\tselector []string\n696\t\t}\n697\t\n698\t\ttotalWork := len(levels)\n699\t\tcclog.Infof(\"[METRICSTORE]> Starting binary checkpoint for %d hosts with %d workers\", totalWork, Keys.NumWorkers)\n700\t\n701\t\tn, errs, completed := int32(0), int32(0), int32(0)\n702\t\tvar successDirs []string\n703\t\tvar successMu sync.Mutex\n704\t\n705\t\tvar wg sync.WaitGroup\n706\t\twg.Add(Keys.NumWorkers)\n707\t\twork := make(chan workItem, Keys.NumWorkers*2)\n708\t\n709\t\t// Progress logging goroutine.\n710\t\tstopProgress := make(chan struct{})\n711\t\tgo func() {\n712\t\t\tticker := time.NewTicker(10 * time.Second)\n713\t\t\tdefer ticker.Stop()\n714\t\t\tfor {\n715\t\t\t\tselect {\n716\t\t\t\tcase <-ticker.C:\n717\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> Checkpoint progress: %d/%d hosts (%d written, %d errors)\",\n718\t\t\t\t\t\tatomic.LoadInt32(&completed), totalWork, atomic.LoadInt32(&n), atomic.LoadInt32(&errs))\n719\t\t\t\tcase <-stopProgress:\n720\t\t\t\t\treturn\n721\t\t\t\t}\n722\t\t\t}\n723\t\t}()\n724\t\n725\t\tfor range Keys.NumWorkers {\n726\t\t\tgo func() {\n727\t\t\t\tdefer wg.Done()\n728\t\t\t\tfor wi := range work {\n729\t\t\t\t\terr := wi.level.toCheckpointBinary(wi.hostDir, from, to, m)\n730\t\t\t\t\tif err != nil {\n731\t\t\t\t\t\tif err == ErrNoNewArchiveData {\n732\t\t\t\t\t\t\tatomic.AddInt32(&completed, 1)\n733\t\t\t\t\t\t\tcontinue\n734\t\t\t\t\t\t}\n735\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> binary checkpoint error for %s: %v\", wi.hostDir, err)\n736\t\t\t\t\t\tatomic.AddInt32(&errs, 1)\n737\t\t\t\t\t} else {\n738\t\t\t\t\t\tatomic.AddInt32(&n, 1)\n739\t\t\t\t\t\tsuccessMu.Lock()\n740\t\t\t\t\t\tsuccessDirs = append(successDirs, wi.hostDir)\n741\t\t\t\t\t\tsuccessMu.Unlock()\n742\t\t\t\t\t}\n743\t\t\t\t\tatomic.AddInt32(&completed, 1)\n744\t\t\t\t}\n745\t\t\t}()\n746\t\t}\n747\t\n748\t\tfor i := range levels {\n749\t\t\thostDir := path.Join(dir, path.Join(selectors[i]...))\n750\t\t\twork <- workItem{\n751\t\t\t\tlevel:    levels[i],\n752\t\t\t\thostDir:  hostDir,\n753\t\t\t\tselector: selectors[i],\n754\t\t\t}\n755\t\t}\n756\t\tclose(work)\n757\t\twg.Wait()\n758\t\tclose(stopProgress)\n759\t\n760\t\tif errs > 0 {\n761\t\t\treturn int(n), successDirs, fmt.Errorf(\"[METRICSTORE]> %d errors during binary checkpoint (%d successes)\", errs, n)\n762\t\t}\n763\t\treturn int(n), successDirs, nil\n764\t}\n765\t\n766\t// toCheckpointBinary writes a binary snapshot file for a single host-level node.\n767\t// Uses atomic rename (write to .tmp then rename) to avoid partial reads on crash.\n768\tfunc (l *Level) toCheckpointBinary(dir string, from, to int64, m *MemoryStore) error {\n769\t\tcf, err := l.toCheckpointFile(from, to, m)\n770\t\tif err != nil {\n771\t\t\treturn err\n772\t\t}\n773\t\tif cf == nil {\n774\t\t\treturn ErrNoNewArchiveData\n775\t\t}\n776\t\n777\t\tif err := os.MkdirAll(dir, CheckpointDirPerms); err != nil {\n778\t\t\treturn fmt.Errorf(\"mkdir %s: %w\", dir, err)\n779\t\t}\n780\t\n781\t\t// Write to a temp file first, then rename (atomic on POSIX).\n782\t\ttmpPath := path.Join(dir, fmt.Sprintf(\"%d.bin.tmp\", from))\n783\t\tfinalPath := path.Join(dir, fmt.Sprintf(\"%d.bin\", from))\n784\t\n785\t\tf, err := os.OpenFile(tmpPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, CheckpointFilePerms)\n786\t\tif err != nil {\n787\t\t\treturn fmt.Errorf(\"open binary snapshot %s: %w\", tmpPath, err)\n788\t\t}\n789\t\n790\t\tbw := bufio.NewWriter(f)\n791\t\tif err := writeBinarySnapshotFile(bw, cf); err != nil {\n792\t\t\tf.Close()\n793\t\t\tos.Remove(tmpPath)\n794\t\t\treturn fmt.Errorf(\"write binary snapshot: %w\", err)\n795\t\t}\n796\t\tif err := bw.Flush(); err != nil {\n797\t\t\tf.Close()\n798\t\t\tos.Remove(tmpPath)\n799\t\t\treturn err\n800\t\t}\n801\t\tf.Close()\n802\t\n803\t\treturn os.Rename(tmpPath, finalPath)\n804\t}\n805\t\n806\t// writeBinarySnapshotFile writes the binary snapshot file header and level tree.\n807\tfunc writeBinarySnapshotFile(w io.Writer, cf *CheckpointFile) error {\n808\t\tif err := binary.Write(w, binary.LittleEndian, snapFileMagic); err != nil {\n809\t\t\treturn err\n810\t\t}\n811\t\tif err := binary.Write(w, binary.LittleEndian, cf.From); err != nil {\n812\t\t\treturn err\n813\t\t}\n814\t\tif err := binary.Write(w, binary.LittleEndian, cf.To); err != nil {\n815\t\t\treturn err\n816\t\t}\n817\t\treturn writeBinaryLevel(w, cf)\n818\t}\n819\t\n820\t// writeBinaryLevel recursively writes a CheckpointFile level in binary format.\n821\tfunc writeBinaryLevel(w io.Writer, cf *CheckpointFile) error {\n822\t\tif err := binary.Write(w, binary.LittleEndian, uint32(len(cf.Metrics))); err != nil {\n823\t\t\treturn err\n824\t\t}\n825\t\n826\t\tfor name, metric := range cf.Metrics {\n827\t\t\tif err := writeString16(w, name); err != nil {\n828\t\t\t\treturn err\n829\t\t\t}\n830\t\t\tif err := binary.Write(w, binary.LittleEndian, metric.Frequency); err != nil {\n831\t\t\t\treturn err\n832\t\t\t}\n833\t\t\tif err := binary.Write(w, binary.LittleEndian, metric.Start); err != nil {\n834\t\t\t\treturn err\n835\t\t\t}\n836\t\t\tif err := binary.Write(w, binary.LittleEndian, uint32(len(metric.Data))); err != nil {\n837\t\t\t\treturn err\n838\t\t\t}\n839\t\t\tfor _, v := range metric.Data {\n840\t\t\t\tif err := binary.Write(w, binary.LittleEndian, math.Float32bits(float32(v))); err != nil {\n841\t\t\t\t\treturn err\n842\t\t\t\t}\n843\t\t\t}\n844\t\t}\n845\t\n846\t\tif err := binary.Write(w, binary.LittleEndian, uint32(len(cf.Children))); err != nil {\n847\t\t\treturn err\n848\t\t}\n849\t\n850\t\tfor name, child := range cf.Children {\n851\t\t\tif err := writeString16(w, name); err != nil {\n852\t\t\t\treturn err\n853\t\t\t}\n854\t\t\tif err := writeBinaryLevel(w, child); err != nil {\n855\t\t\t\treturn err\n856\t\t\t}\n857\t\t}\n858\t\n859\t\treturn nil\n860\t}\n861\t\n862\t// writeString16 writes a 2-byte length-prefixed string to w.\n863\tfunc writeString16(w io.Writer, s string) error {\n864\t\tif err := binary.Write(w, binary.LittleEndian, uint16(len(s))); err != nil {\n865\t\t\treturn err\n866\t\t}\n867\t\t_, err := io.WriteString(w, s)\n868\t\treturn err\n869\t}\n870\t\n871\t// loadBinaryFile reads a binary snapshot file and loads data into the Level tree.\n872\t// The retention check (from) is applied to the file's 'to' timestamp.\n873\tfunc (l *Level) loadBinaryFile(m *MemoryStore, f *os.File, from int64) error {\n874\t\tbr := bufio.NewReader(f)\n875\t\n876\t\tvar magic uint32\n877\t\tif err := binary.Read(br, binary.LittleEndian, &magic); err != nil {\n878\t\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read magic: %w\", err)\n879\t\t}\n880\t\tif magic != snapFileMagic {\n881\t\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: invalid magic 0x%08X (expected 0x%08X)\", magic, snapFileMagic)\n882\t\t}\n883\t\n884\t\tvar fileFrom, fileTo int64\n885\t\tif err := binary.Read(br, binary.LittleEndian, &fileFrom); err != nil {\n886\t\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read from: %w\", err)\n887\t\t}\n888\t\tif err := binary.Read(br, binary.LittleEndian, &fileTo); err != nil {\n889\t\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read to: %w\", err)\n890\t\t}\n891\t\n892\t\tif fileTo != 0 && fileTo < from {\n893\t\t\treturn nil // File is older than retention window, skip it\n894\t\t}\n895\t\n896\t\tcf, err := readBinaryLevel(br)\n897\t\tif err != nil {\n898\t\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read level tree: %w\", err)\n899\t\t}\n900\t\tcf.From = fileFrom\n901\t\tcf.To = fileTo\n902\t\n903\t\treturn l.loadFile(cf, m)\n904\t}\n905\t\n906\t// readBinaryLevel recursively reads a level from the binary snapshot format.\n907\tfunc readBinaryLevel(r io.Reader) (*CheckpointFile, error) {\n908\t\tcf := &CheckpointFile{\n909\t\t\tMetrics:  make(map[string]*CheckpointMetrics),\n910\t\t\tChildren: make(map[string]*CheckpointFile),\n911\t\t}\n912\t\n913\t\tvar numMetrics uint32\n914\t\tif err := binary.Read(r, binary.LittleEndian, &numMetrics); err != nil {\n915\t\t\treturn nil, fmt.Errorf(\"read num_metrics: %w\", err)\n916\t\t}\n917\t\n918\t\tfor range numMetrics {\n919\t\t\tname, err := readString16(r)\n920\t\t\tif err != nil {\n921\t\t\t\treturn nil, fmt.Errorf(\"read metric name: %w\", err)\n922\t\t\t}\n923\t\n924\t\t\tvar freq, start int64\n925\t\t\tif err := binary.Read(r, binary.LittleEndian, &freq); err != nil {\n926\t\t\t\treturn nil, fmt.Errorf(\"read frequency for %s: %w\", name, err)\n927\t\t\t}\n928\t\t\tif err := binary.Read(r, binary.LittleEndian, &start); err != nil {\n929\t\t\t\treturn nil, fmt.Errorf(\"read start for %s: %w\", name, err)\n930\t\t\t}\n931\t\n932\t\t\tvar numValues uint32\n933\t\t\tif err := binary.Read(r, binary.LittleEndian, &numValues); err != nil {\n934\t\t\t\treturn nil, fmt.Errorf(\"read num_values for %s: %w\", name, err)\n935\t\t\t}\n936\t\n937\t\t\tdata := make([]schema.Float, numValues)\n938\t\t\tfor i := range numValues {\n939\t\t\t\tvar bits uint32\n940\t\t\t\tif err := binary.Read(r, binary.LittleEndian, &bits); err != nil {\n941\t\t\t\t\treturn nil, fmt.Errorf(\"read value[%d] for %s: %w\", i, name, err)\n942\t\t\t\t}\n943\t\t\t\tdata[i] = schema.Float(math.Float32frombits(bits))\n944\t\t\t}\n945\t\n946\t\t\tcf.Metrics[name] = &CheckpointMetrics{\n947\t\t\t\tFrequency: freq,\n948\t\t\t\tStart:     start,\n949\t\t\t\tData:      data,\n950\t\t\t}\n951\t\t}\n952\t\n953\t\tvar numChildren uint32\n954\t\tif err := binary.Read(r, binary.LittleEndian, &numChildren); err != nil {\n955\t\t\treturn nil, fmt.Errorf(\"read num_children: %w\", err)\n956\t\t}\n957\t\n958\t\tfor range numChildren {\n959\t\t\tchildName, err := readString16(r)\n960\t\t\tif err != nil {\n961\t\t\t\treturn nil, fmt.Errorf(\"read child name: %w\", err)\n962\t\t\t}\n963\t\n964\t\t\tchild, err := readBinaryLevel(r)\n965\t\t\tif err != nil {\n966\t\t\t\treturn nil, fmt.Errorf(\"read child %s: %w\", childName, err)\n967\t\t\t}\n968\t\t\tcf.Children[childName] = child\n969\t\t}\n970\t\n971\t\treturn cf, nil\n972\t}\n973\t\n974\t// readString16 reads a 2-byte length-prefixed string from r.\n975\tfunc readString16(r io.Reader) (string, error) {\n976\t\tvar sLen uint16\n977\t\tif err := binary.Read(r, binary.LittleEndian, &sLen); err != nil {\n978\t\t\treturn \"\", err\n979\t\t}\n980\t\tbuf := make([]byte, sLen)\n981\t\tif _, err := io.ReadFull(r, buf); err != nil {\n982\t\t\treturn \"\", err\n983\t\t}\n984\t\treturn string(buf), nil\n985\t}\n986\t"}]},"uuid":"92de2e37-9e08-4b6f-abeb-94f747359225","timestamp":"2026-06-05T06:32:32.052Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/walCheckpoint.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 walCheckpoint.go: WAL-based checkpoint implementation.\n//\n// This replaces the Avro shadow tree with an append-only Write-Ahead Log (WAL)\n// per host, eliminating the extra memory overhead of the AvroStore and providing\n// truly continuous (per-write) crash safety.\n//\n// # Architecture\n//\n//\tMetric write (DecodeLine)\n//\t      │\n//\t      ├─► WriteToLevel()    → main MemoryStore (unchanged)\n//\t      │\n//\t      └─► WALMessages channel\n//\t               │\n//\t               ▼\n//\t        WALStaging goroutine\n//\t               │\n//\t               ▼\n//\t        checkpoints/cluster/host/current.wal  (append-only, binary)\n//\n//\tPeriodic checkpoint (Checkpointing goroutine):\n//\t  1. Write <timestamp>.bin snapshot (column-oriented, from main tree)\n//\t  2. Signal WALStaging to truncate current.wal per host\n//\n//\tOn restart (FromCheckpoint):\n//\t  1. Load most recent <timestamp>.bin snapshot\n//\t  2. Replay current.wal (overwrite-safe: buffer.write handles duplicate timestamps)\n//\n// # WAL Record Format\n//\n//\t[4B magic 0xCC1DA7A1][4B payload_len][payload][4B CRC32]\n//\n//\tpayload:\n//\t  [8B timestamp int64]\n//\t  [2B metric_name_len uint16][N metric name bytes]\n//\t  [1B selector_count uint8]\n//\t  per selector: [1B selector_len uint8][M selector bytes]\n//\t  [4B value float32 bits]\n//\n// # Binary Snapshot Format\n//\n//\t[4B magic 0xCC5B0001][8B from int64][8B to int64]\n//\tLevel tree (recursive):\n//\t  [4B num_metrics uint32]\n//\t  per metric:\n//\t    [2B name_len uint16][N name bytes]\n//\t    [8B frequency int64][8B start int64]\n//\t    [4B num_values uint32][num_values × 4B float32]\n//\t  [4B num_children uint32]\n//\t  per child: [2B name_len uint16][N name bytes] + Level (recursive)\npackage metricstore\n\nimport (\n\t\"bufio\"\n\t\"context\"\n\t\"encoding/binary\"\n\t\"fmt\"\n\t\"hash/crc32\"\n\t\"hash/fnv\"\n\t\"io\"\n\t\"math\"\n\t\"os\"\n\t\"path\"\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\n// Magic numbers for binary formats.\nconst (\n\twalFileMagic   = uint32(0xCC1DA701) // WAL file header magic\n\twalRecordMagic = uint32(0xCC1DA7A1) // WAL record magic\n\tsnapFileMagic  = uint32(0xCC5B0001) // Binary snapshot magic\n)\n\n// walShardChs holds per-shard channels for WAL messages.\n// Initialized by WALStaging; nil when WAL is not active.\nvar walShardChs []chan *WALMessage\n\n// walShardRotateChs holds per-shard channels for WAL rotation requests.\nvar walShardRotateChs []chan walRotateReq\n\n// walNumShards stores the number of shards (set during WALStaging init).\nvar walNumShards int\n\n// walStagingWg tracks WALStaging goroutine exits for shutdown synchronization.\nvar walStagingWg sync.WaitGroup\n\n// walShuttingDown is set before closing shard channels to prevent\n// SendWALMessage from sending on a closed channel (which panics in Go).\nvar walShuttingDown atomic.Bool\n\n// walCheckpointActive is set during binary checkpoint writes.\n// While active, SendWALMessage skips sending (returns true) because the\n// snapshot captures all in-memory data, making WAL writes redundant.\nvar walCheckpointActive atomic.Bool\n\n// WALMessage represents a single metric write to be appended to the WAL.\n// Cluster and Node are NOT stored in the WAL record (inferred from file path).\ntype WALMessage struct {\n\tMetricName string\n\tCluster    string\n\tNode       string\n\tSelector   []string\n\tValue      schema.Float\n\tTimestamp  int64\n}\n\n// walRotateReq requests WAL file rotation for a specific host directory.\n// The done channel is closed by the WAL goroutine when rotation is complete.\ntype walRotateReq struct {\n\thostDir string\n\tdone    chan struct{}\n}\n\n// walFileState holds an open WAL file handle and buffered writer for one host directory.\ntype walFileState struct {\n\tf     *os.File\n\tw     *bufio.Writer\n\tdirty bool\n\tsize  int64 // approximate bytes written (tracked from open + writes)\n}\n\n// walFlushInterval controls how often dirty WAL files are flushed to disk.\n// Decoupling flushes from message processing lets the consumer run at memory\n// speed, amortizing syscall overhead across many writes.\nconst walFlushInterval = 1 * time.Second\n\n// walShardIndex computes which shard a message belongs to based on cluster+node.\n// Uses FNV-1a hash for fast, well-distributed mapping.\nfunc walShardIndex(cluster, node string) int {\n\th := fnv.New32a()\n\th.Write([]byte(cluster))\n\th.Write([]byte{0})\n\th.Write([]byte(node))\n\treturn int(h.Sum32()) % walNumShards\n}\n\n// SendWALMessage routes a WAL message to the appropriate shard channel.\n// Returns false if the channel is full or shutdown is in progress.\nfunc SendWALMessage(msg *WALMessage) bool {\n\tif walShardChs == nil || walShuttingDown.Load() {\n\t\treturn false\n\t}\n\tif walCheckpointActive.Load() {\n\t\treturn true // Data safe in memory; snapshot will capture it\n\t}\n\tshard := walShardIndex(msg.Cluster, msg.Node)\n\tselect {\n\tcase walShardChs[shard] <- msg:\n\t\treturn true\n\tdefault:\n\t\treturn false\n\t}\n}\n\n// WALStaging starts N sharded background goroutines that receive WALMessage items\n// and append binary WAL records to per-host current.wal files.\n// Each shard owns a subset of hosts (determined by hash of cluster+node),\n// parallelizing serialization and I/O while keeping per-host writes serial.\nfunc WALStaging(wg *sync.WaitGroup, ctx context.Context) {\n\tif Keys.Checkpoints.FileFormat == \"json\" {\n\t\treturn\n\t}\n\n\twalNumShards = max(Keys.NumWorkers, 1)\n\tchBufSize := max(65536/walNumShards, 1024)\n\n\twalShardChs = make([]chan *WALMessage, walNumShards)\n\twalShardRotateChs = make([]chan walRotateReq, walNumShards)\n\n\tfor i := range walNumShards {\n\t\twalShardChs[i] = make(chan *WALMessage, chBufSize)\n\t\twalShardRotateChs[i] = make(chan walRotateReq, 64)\n\t}\n\n\tfor i := range walNumShards {\n\t\tmsgCh := walShardChs[i]\n\t\trotateCh := walShardRotateChs[i]\n\n\t\twalStagingWg.Add(1)\n\t\twg.Go(func() {\n\t\t\tdefer walStagingWg.Done()\n\t\t\thostFiles := make(map[string]*walFileState)\n\n\t\t\tdefer func() {\n\t\t\t\tfor _, ws := range hostFiles {\n\t\t\t\t\tif ws.f != nil {\n\t\t\t\t\t\tws.w.Flush()\n\t\t\t\t\t\tws.f.Close()\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}()\n\n\t\t\tgetOrOpenWAL := func(hostDir string) *walFileState {\n\t\t\t\tws, ok := hostFiles[hostDir]\n\t\t\t\tif ok {\n\t\t\t\t\treturn ws\n\t\t\t\t}\n\n\t\t\t\tif err := os.MkdirAll(hostDir, CheckpointDirPerms); err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: mkdir %s: %v\", hostDir, err)\n\t\t\t\t\treturn nil\n\t\t\t\t}\n\n\t\t\t\twalPath := path.Join(hostDir, \"current.wal\")\n\t\t\t\tf, err := os.OpenFile(walPath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, CheckpointFilePerms)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: open %s: %v\", walPath, err)\n\t\t\t\t\treturn nil\n\t\t\t\t}\n\n\t\t\t\tw := bufio.NewWriter(f)\n\n\t\t\t\t// Write file header magic if file is new (empty).\n\t\t\t\tinfo, err := f.Stat()\n\t\t\t\tvar fileSize int64\n\t\t\t\tif err == nil {\n\t\t\t\t\tfileSize = info.Size()\n\t\t\t\t}\n\t\t\t\tif err == nil && fileSize == 0 {\n\t\t\t\t\tvar hdr [4]byte\n\t\t\t\t\tbinary.LittleEndian.PutUint32(hdr[:], walFileMagic)\n\t\t\t\t\tif _, err := w.Write(hdr[:]); err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: write header %s: %v\", walPath, err)\n\t\t\t\t\t\tf.Close()\n\t\t\t\t\t\treturn nil\n\t\t\t\t\t}\n\t\t\t\t\tfileSize = 4\n\t\t\t\t}\n\n\t\t\t\tws = &walFileState{f: f, w: w, size: fileSize}\n\t\t\t\thostFiles[hostDir] = ws\n\t\t\t\treturn ws\n\t\t\t}\n\n\t\t\tprocessMsg := func(msg *WALMessage) {\n\t\t\t\thostDir := path.Join(Keys.Checkpoints.RootDir, msg.Cluster, msg.Node)\n\t\t\t\tws := getOrOpenWAL(hostDir)\n\t\t\t\tif ws == nil {\n\t\t\t\t\treturn\n\t\t\t\t}\n\n\t\t\t\t// Enforce max WAL size: force-rotate before writing if limit is exceeded.\n\t\t\t\t// The in-memory store still holds the data; only crash-recovery coverage is lost.\n\t\t\t\tif maxSize := Keys.Checkpoints.MaxWALSize; maxSize > 0 && ws.size >= maxSize {\n\t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> WAL: force-rotating %s (size %d >= limit %d)\",\n\t\t\t\t\t\thostDir, ws.size, maxSize)\n\t\t\t\t\tws.w.Flush()\n\t\t\t\t\tws.f.Close()\n\t\t\t\t\twalPath := path.Join(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\tdelete(hostFiles, hostDir)\n\t\t\t\t\tws = getOrOpenWAL(hostDir)\n\t\t\t\t\tif ws == nil {\n\t\t\t\t\t\treturn\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tn, err := writeWALRecordDirect(ws.w, msg)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: write record: %v\", err)\n\t\t\t\t}\n\t\t\t\tws.size += int64(n)\n\t\t\t\tws.dirty = true\n\t\t\t}\n\n\t\t\tprocessRotate := func(req walRotateReq) {\n\t\t\t\tws, ok := hostFiles[req.hostDir]\n\t\t\t\tif ok && ws.f != nil {\n\t\t\t\t\tws.w.Flush()\n\t\t\t\t\tws.f.Close()\n\t\t\t\t\twalPath := path.Join(req.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\tdelete(hostFiles, req.hostDir)\n\t\t\t\t}\n\t\t\t\tclose(req.done)\n\t\t\t}\n\n\t\t\tflushDirty := func() {\n\t\t\t\tfor _, ws := range hostFiles {\n\t\t\t\t\tif ws.dirty {\n\t\t\t\t\t\tws.w.Flush()\n\t\t\t\t\t\tws.dirty = false\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tticker := time.NewTicker(walFlushInterval)\n\t\t\tdefer ticker.Stop()\n\n\t\t\t// drainBatch processes up to 4096 pending messages without blocking.\n\t\t\t// Returns false if the channel was closed.\n\t\t\tdrainBatch := func() bool {\n\t\t\t\tfor range 4096 {\n\t\t\t\t\tselect {\n\t\t\t\t\tcase msg, ok := <-msgCh:\n\t\t\t\t\t\tif !ok {\n\t\t\t\t\t\t\tflushDirty()\n\t\t\t\t\t\t\treturn false\n\t\t\t\t\t\t}\n\t\t\t\t\t\tprocessMsg(msg)\n\t\t\t\t\tcase req := <-rotateCh:\n\t\t\t\t\t\tprocessRotate(req)\n\t\t\t\t\tdefault:\n\t\t\t\t\t\treturn true\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\treturn true\n\t\t\t}\n\n\t\t\tfor {\n\t\t\t\tselect {\n\t\t\t\tcase <-ctx.Done():\n\t\t\t\t\t// On shutdown, skip draining buffered messages — a full binary\n\t\t\t\t\t// checkpoint will be written from in-memory state, making\n\t\t\t\t\t// buffered WAL records redundant.\n\t\t\t\t\tflushDirty()\n\t\t\t\t\treturn\n\t\t\t\tcase msg, ok := <-msgCh:\n\t\t\t\t\tif !ok {\n\t\t\t\t\t\treturn\n\t\t\t\t\t}\n\t\t\t\t\tprocessMsg(msg)\n\t\t\t\t\tif !drainBatch() {\n\t\t\t\t\t\treturn\n\t\t\t\t\t}\n\t\t\t\t\t// No flush here — timer handles periodic flushing.\n\t\t\t\tcase <-ticker.C:\n\t\t\t\t\tflushDirty()\n\t\t\t\tcase req := <-rotateCh:\n\t\t\t\t\tprocessRotate(req)\n\t\t\t\t}\n\t\t\t}\n\t\t})\n\t}\n}\n\n// WaitForWALStagingDrain blocks until all WALStaging goroutines have exited.\n// Must be called after closing walShardChs to ensure all file handles are\n// flushed and closed before checkpoint writes begin.\nfunc WaitForWALStagingDrain() {\n\twalStagingWg.Wait()\n}\n\n// RotateWALFiles sends rotation requests for the given host directories\n// and blocks until all rotations complete. Each request is routed to the\n// shard that owns the host directory.\n//\n// If shutdown is in progress (WAL staging goroutines may have exited),\n// rotation is skipped to avoid deadlocking on abandoned channels.\nfunc RotateWALFiles(hostDirs []string) {\n\tif walShardRotateChs == nil || walShuttingDown.Load() {\n\t\treturn\n\t}\n\tdeadline := time.After(2 * time.Minute)\n\tdones := make([]chan struct{}, 0, len(hostDirs))\n\tfor _, dir := range hostDirs {\n\t\tdone := make(chan struct{})\n\t\tshard := walShardIndexFromDir(dir)\n\t\tselect {\n\t\tcase walShardRotateChs[shard] <- walRotateReq{hostDir: dir, done: done}:\n\t\t\tdones = append(dones, done)\n\t\tcase <-deadline:\n\t\t\tcclog.Warnf(\"[METRICSTORE]> WAL rotation send timed out, %d of %d hosts remaining\",\n\t\t\t\tlen(hostDirs)-len(dones), len(hostDirs))\n\t\t\tgoto waitDones\n\t\t}\n\t}\nwaitDones:\n\tfor _, done := range dones {\n\t\tselect {\n\t\tcase <-done:\n\t\tcase <-time.After(30 * time.Second):\n\t\t\tcclog.Warn(\"[METRICSTORE]> WAL rotation completion timed out, continuing\")\n\t\t\treturn\n\t\t}\n\t}\n}\n\n// walShardIndexFromDir extracts cluster and node from a host directory path\n// and returns the shard index. The path format is: rootDir/cluster/node\nfunc walShardIndexFromDir(hostDir string) int {\n\t// hostDir = .../cluster/node — extract last two path components\n\tnode := path.Base(hostDir)\n\tcluster := path.Base(path.Dir(hostDir))\n\treturn walShardIndex(cluster, node)\n}\n\n// RotateWALFilesAfterShutdown directly removes current.wal files for the given\n// host directories. Used after shutdown, when WALStaging goroutines have already\n// exited and the channel-based RotateWALFiles is no longer safe to call.\nfunc RotateWALFilesAfterShutdown(hostDirs []string) {\n\tfor _, dir := range hostDirs {\n\t\twalPath := path.Join(dir, \"current.wal\")\n\t\tif err := os.Remove(walPath); err != nil && !os.IsNotExist(err) {\n\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: remove %s: %v\", walPath, err)\n\t\t}\n\t}\n}\n\n// writeWALRecordDirect encodes a WAL record into a contiguous buffer first,\n// then writes it to the bufio.Writer in a single call. This prevents partial\n// records in the write buffer if a write error occurs mid-record (e.g. disk full).\n// Returns the number of bytes written and any error.\nfunc writeWALRecordDirect(w *bufio.Writer, msg *WALMessage) (int, error) {\n\t// Compute payload and total record size.\n\tpayloadSize := 8 + 2 + len(msg.MetricName) + 1 + 4\n\tfor _, s := range msg.Selector {\n\t\tpayloadSize += 1 + len(s)\n\t}\n\t// Total: 8 (header) + payload + 4 (CRC).\n\ttotalSize := 8 + payloadSize + 4\n\n\t// Use stack buffer for typical small records, heap-allocate only for large ones.\n\tvar stackBuf [256]byte\n\tvar buf []byte\n\tif totalSize <= len(stackBuf) {\n\t\tbuf = stackBuf[:totalSize]\n\t} else {\n\t\tbuf = make([]byte, totalSize)\n\t}\n\n\t// Header: magic + payload length.\n\tbinary.LittleEndian.PutUint32(buf[0:4], walRecordMagic)\n\tbinary.LittleEndian.PutUint32(buf[4:8], uint32(payloadSize))\n\n\t// Payload starts at offset 8.\n\tp := 8\n\n\t// Timestamp (8 bytes).\n\tbinary.LittleEndian.PutUint64(buf[p:p+8], uint64(msg.Timestamp))\n\tp += 8\n\n\t// Metric name length (2 bytes) + metric name.\n\tbinary.LittleEndian.PutUint16(buf[p:p+2], uint16(len(msg.MetricName)))\n\tp += 2\n\tp += copy(buf[p:], msg.MetricName)\n\n\t// Selector count (1 byte).\n\tbuf[p] = byte(len(msg.Selector))\n\tp++\n\n\t// Selectors (1-byte length + bytes each).\n\tfor _, sel := range msg.Selector {\n\t\tbuf[p] = byte(len(sel))\n\t\tp++\n\t\tp += copy(buf[p:], sel)\n\t}\n\n\t// Value (4 bytes, float32 bits).\n\tbinary.LittleEndian.PutUint32(buf[p:p+4], math.Float32bits(float32(msg.Value)))\n\tp += 4\n\n\t// CRC32 over payload (bytes 8..8+payloadSize).\n\tcrc := crc32.ChecksumIEEE(buf[8 : 8+payloadSize])\n\tbinary.LittleEndian.PutUint32(buf[p:p+4], crc)\n\n\t// Single atomic write to the buffered writer.\n\tn, err := w.Write(buf)\n\treturn n, err\n}\n\n// readWALRecord reads one WAL record from the reader.\n// Returns (nil, nil) on clean EOF. Returns error on data corruption.\n// A CRC mismatch indicates a truncated trailing record (expected on crash).\nfunc readWALRecord(r io.Reader) (*WALMessage, error) {\n\tvar magic uint32\n\tif err := binary.Read(r, binary.LittleEndian, &magic); err != nil {\n\t\tif err == io.EOF {\n\t\t\treturn nil, nil // Clean EOF\n\t\t}\n\t\treturn nil, fmt.Errorf(\"read record magic: %w\", err)\n\t}\n\n\tif magic != walRecordMagic {\n\t\treturn nil, fmt.Errorf(\"invalid record magic 0x%08X (expected 0x%08X)\", magic, walRecordMagic)\n\t}\n\n\tvar payloadLen uint32\n\tif err := binary.Read(r, binary.LittleEndian, &payloadLen); err != nil {\n\t\treturn nil, fmt.Errorf(\"read payload length: %w\", err)\n\t}\n\n\tif payloadLen > 1<<20 { // 1 MB sanity limit\n\t\treturn nil, fmt.Errorf(\"record payload too large: %d bytes\", payloadLen)\n\t}\n\n\tpayload := make([]byte, payloadLen)\n\tif _, err := io.ReadFull(r, payload); err != nil {\n\t\treturn nil, fmt.Errorf(\"read payload: %w\", err)\n\t}\n\n\tvar storedCRC uint32\n\tif err := binary.Read(r, binary.LittleEndian, &storedCRC); err != nil {\n\t\treturn nil, fmt.Errorf(\"read CRC: %w\", err)\n\t}\n\n\tif crc32.ChecksumIEEE(payload) != storedCRC {\n\t\treturn nil, fmt.Errorf(\"CRC mismatch (truncated write or corruption)\")\n\t}\n\n\treturn parseWALPayload(payload)\n}\n\n// parseWALPayload decodes a binary payload into a WALMessage.\nfunc parseWALPayload(payload []byte) (*WALMessage, error) {\n\tif len(payload) < 8+2+1+4 {\n\t\treturn nil, fmt.Errorf(\"payload too short: %d bytes\", len(payload))\n\t}\n\n\toffset := 0\n\n\t// Timestamp (8 bytes)\n\tts := int64(binary.LittleEndian.Uint64(payload[offset : offset+8]))\n\toffset += 8\n\n\t// Metric name (2-byte length + bytes)\n\tif offset+2 > len(payload) {\n\t\treturn nil, fmt.Errorf(\"metric name length overflows payload\")\n\t}\n\tmLen := int(binary.LittleEndian.Uint16(payload[offset : offset+2]))\n\toffset += 2\n\n\tif offset+mLen > len(payload) {\n\t\treturn nil, fmt.Errorf(\"metric name overflows payload\")\n\t}\n\tmetricName := string(payload[offset : offset+mLen])\n\toffset += mLen\n\n\t// Selector count (1 byte)\n\tif offset >= len(payload) {\n\t\treturn nil, fmt.Errorf(\"selector count overflows payload\")\n\t}\n\tselCount := int(payload[offset])\n\toffset++\n\n\tselectors := make([]string, selCount)\n\tfor i := range selCount {\n\t\tif offset >= len(payload) {\n\t\t\treturn nil, fmt.Errorf(\"selector[%d] length overflows payload\", i)\n\t\t}\n\t\tsLen := int(payload[offset])\n\t\toffset++\n\n\t\tif offset+sLen > len(payload) {\n\t\t\treturn nil, fmt.Errorf(\"selector[%d] data overflows payload\", i)\n\t\t}\n\t\tselectors[i] = string(payload[offset : offset+sLen])\n\t\toffset += sLen\n\t}\n\n\t// Value (4 bytes, float32 bits)\n\tif offset+4 > len(payload) {\n\t\treturn nil, fmt.Errorf(\"value overflows payload\")\n\t}\n\tbits := binary.LittleEndian.Uint32(payload[offset : offset+4])\n\tvalue := schema.Float(math.Float32frombits(bits))\n\n\treturn &WALMessage{\n\t\tMetricName: metricName,\n\t\tTimestamp:  ts,\n\t\tSelector:   selectors,\n\t\tValue:      value,\n\t}, nil\n}\n\n// loadWALFile reads a WAL file and replays all valid records into the Level tree.\n// l is the host-level node. Corrupt or partial trailing records are silently skipped\n// (expected on crash). Records older than 'from' are skipped.\nfunc (l *Level) loadWALFile(m *MemoryStore, f *os.File, from int64) error {\n\tbr := bufio.NewReader(f)\n\n\t// Verify file header magic.\n\tvar fileMagic uint32\n\tif err := binary.Read(br, binary.LittleEndian, &fileMagic); err != nil {\n\t\tif err == io.EOF {\n\t\t\treturn nil // Empty file, no data\n\t\t}\n\t\treturn fmt.Errorf(\"[METRICSTORE]> WAL: read file header: %w\", err)\n\t}\n\n\tif fileMagic != walFileMagic {\n\t\treturn fmt.Errorf(\"[METRICSTORE]> WAL: invalid file magic 0x%08X (expected 0x%08X)\", fileMagic, walFileMagic)\n\t}\n\n\t// Cache level lookups to avoid repeated tree traversal.\n\tlvlCache := make(map[string]*Level)\n\n\tfor {\n\t\tmsg, err := readWALRecord(br)\n\t\tif err != nil {\n\t\t\t// Truncated trailing record is expected after a crash; stop replaying.\n\t\t\tcclog.Debugf(\"[METRICSTORE]> WAL: stopping replay at corrupted/partial record: %v\", err)\n\t\t\tbreak\n\t\t}\n\t\tif msg == nil {\n\t\t\tbreak // Clean EOF\n\t\t}\n\n\t\tif msg.Timestamp < from {\n\t\t\tcontinue // Older than retention window\n\t\t}\n\n\t\tminfo, ok := m.Metrics[msg.MetricName]\n\t\tif !ok {\n\t\t\tcontinue // Unknown metric (config may have changed)\n\t\t}\n\n\t\t// Cache key is the null-separated selector path.\n\t\tcacheKey := joinSelector(msg.Selector)\n\t\tlvl, ok := lvlCache[cacheKey]\n\t\tif !ok {\n\t\t\tlvl = l.findLevelOrCreate(msg.Selector, len(m.Metrics))\n\t\t\tlvlCache[cacheKey] = lvl\n\t\t}\n\n\t\t// Write directly to the buffer, same as WriteToLevel but without the\n\t\t// global level lookup (we already have the right level).\n\t\tlvl.lock.Lock()\n\t\tb := lvl.metrics[minfo.offset]\n\t\tif b == nil {\n\t\t\tb = newBuffer(msg.Timestamp, minfo.Frequency)\n\t\t\tlvl.metrics[minfo.offset] = b\n\t\t}\n\t\tnb, writeErr := b.write(msg.Timestamp, msg.Value)\n\t\tif writeErr == nil && b != nb {\n\t\t\tlvl.metrics[minfo.offset] = nb\n\t\t}\n\t\t// Ignore write errors for timestamps before buffer start (can happen when\n\t\t// replaying WAL entries that predate a loaded snapshot's start time).\n\t\tlvl.lock.Unlock()\n\t}\n\n\treturn nil\n}\n\n// joinSelector builds a cache key from a selector slice using null bytes as separators.\nfunc joinSelector(sel []string) string {\n\tif len(sel) == 0 {\n\t\treturn \"\"\n\t}\n\tvar result strings.Builder\n\tresult.WriteString(sel[0])\n\tfor i := 1; i < len(sel); i++ {\n\t\tresult.WriteString(\"\\x00\" + sel[i])\n\t}\n\treturn result.String()\n}\n\n// ToCheckpointWAL writes binary snapshot files for all hosts in parallel.\n// Returns the number of files written, the list of host directories that were\n// successfully checkpointed (for WAL rotation), and any errors.\nfunc (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\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)\n\t}\n\treturn int(n), successDirs, nil\n}\n\n// toCheckpointBinary writes a binary snapshot file for a single host-level node.\n// Uses atomic rename (write to .tmp then rename) to avoid partial reads on crash.\nfunc (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\n\t}\n\n\tfor name, child := range cf.Children {\n\t\tif err := writeString16(w, name); err != nil {\n\t\t\treturn err\n\t\t}\n\t\tif err := writeBinaryLevel(w, child); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\n\treturn nil\n}\n\n// writeString16 writes a 2-byte length-prefixed string to w.\nfunc writeString16(w io.Writer, s string) error {\n\tif err := binary.Write(w, binary.LittleEndian, uint16(len(s))); err != nil {\n\t\treturn err\n\t}\n\t_, err := io.WriteString(w, s)\n\treturn err\n}\n\n// loadBinaryFile reads a binary snapshot file and loads data into the Level tree.\n// The retention check (from) is applied to the file's 'to' timestamp.\nfunc (l *Level) loadBinaryFile(m *MemoryStore, f *os.File, from int64) error {\n\tbr := bufio.NewReader(f)\n\n\tvar magic uint32\n\tif err := binary.Read(br, binary.LittleEndian, &magic); err != nil {\n\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read magic: %w\", err)\n\t}\n\tif magic != snapFileMagic {\n\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: invalid magic 0x%08X (expected 0x%08X)\", magic, snapFileMagic)\n\t}\n\n\tvar fileFrom, fileTo int64\n\tif err := binary.Read(br, binary.LittleEndian, &fileFrom); err != nil {\n\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read from: %w\", err)\n\t}\n\tif err := binary.Read(br, binary.LittleEndian, &fileTo); err != nil {\n\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read to: %w\", err)\n\t}\n\n\tif fileTo != 0 && fileTo < from {\n\t\treturn nil // File is older than retention window, skip it\n\t}\n\n\tcf, err := readBinaryLevel(br)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read level tree: %w\", err)\n\t}\n\tcf.From = fileFrom\n\tcf.To = fileTo\n\n\treturn l.loadFile(cf, m)\n}\n\n// readBinaryLevel recursively reads a level from the binary snapshot format.\nfunc readBinaryLevel(r io.Reader) (*CheckpointFile, error) {\n\tcf := &CheckpointFile{\n\t\tMetrics:  make(map[string]*CheckpointMetrics),\n\t\tChildren: make(map[string]*CheckpointFile),\n\t}\n\n\tvar numMetrics uint32\n\tif err := binary.Read(r, binary.LittleEndian, &numMetrics); err != nil {\n\t\treturn nil, fmt.Errorf(\"read num_metrics: %w\", err)\n\t}\n\n\tfor range numMetrics {\n\t\tname, err := readString16(r)\n\t\tif err != nil {\n\t\t\treturn nil, fmt.Errorf(\"read metric name: %w\", err)\n\t\t}\n\n\t\tvar freq, start int64\n\t\tif err := binary.Read(r, binary.LittleEndian, &freq); err != nil {\n\t\t\treturn nil, fmt.Errorf(\"read frequency for %s: %w\", name, err)\n\t\t}\n\t\tif err := binary.Read(r, binary.LittleEndian, &start); err != nil {\n\t\t\treturn nil, fmt.Errorf(\"read start for %s: %w\", name, err)\n\t\t}\n\n\t\tvar numValues uint32\n\t\tif err := binary.Read(r, binary.LittleEndian, &numValues); err != nil {\n\t\t\treturn nil, fmt.Errorf(\"read num_values for %s: %w\", name, err)\n\t\t}\n\n\t\tdata := make([]schema.Float, numValues)\n\t\tfor i := range numValues {\n\t\t\tvar bits uint32\n\t\t\tif err := binary.Read(r, binary.LittleEndian, &bits); err != nil {\n\t\t\t\treturn nil, fmt.Errorf(\"read value[%d] for %s: %w\", i, name, err)\n\t\t\t}\n\t\t\tdata[i] = schema.Float(math.Float32frombits(bits))\n\t\t}\n\n\t\tcf.Metrics[name] = &CheckpointMetrics{\n\t\t\tFrequency: freq,\n\t\t\tStart:     start,\n\t\t\tData:      data,\n\t\t}\n\t}\n\n\tvar numChildren uint32\n\tif err := binary.Read(r, binary.LittleEndian, &numChildren); err != nil {\n\t\treturn nil, fmt.Errorf(\"read num_children: %w\", err)\n\t}\n\n\tfor range numChildren {\n\t\tchildName, err := readString16(r)\n\t\tif err != nil {\n\t\t\treturn nil, fmt.Errorf(\"read child name: %w\", err)\n\t\t}\n\n\t\tchild, err := readBinaryLevel(r)\n\t\tif err != nil {\n\t\t\treturn nil, fmt.Errorf(\"read child %s: %w\", childName, err)\n\t\t}\n\t\tcf.Children[childName] = child\n\t}\n\n\treturn cf, nil\n}\n\n// readString16 reads a 2-byte length-prefixed string from r.\nfunc readString16(r io.Reader) (string, error) {\n\tvar sLen uint16\n\tif err := binary.Read(r, binary.LittleEndian, &sLen); err != nil {\n\t\treturn \"\", err\n\t}\n\tbuf := make([]byte, sLen)\n\tif _, err := io.ReadFull(r, buf); err != nil {\n\t\treturn \"\", err\n\t}\n\treturn string(buf), nil\n}\n","numLines":986,"startLine":1,"totalLines":986}},"sourceToolAssistantUUID":"3c6b71b5-d8b6-4661-9c49-083966474dee","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
+{"type":"last-prompt","lastPrompt":"This application uses a files based checkpointing mechanism using a WAL algorithm for crash recovery. Analyse when the wal files are reset. Currently the wal files are not reset and continously grow a…","leafUuid":"92de2e37-9e08-4b6f-abeb-94f747359225","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63"}
+{"type":"ai-title","aiTitle":"Analyze WAL file reset mechanism in checkpoint system","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63"}
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This file is part of cc-backend.\n3\t// Use of this source code is governed by a MIT-style\n4\t// license that can be found in the LICENSE file.\n5\t\n6\t// Package metricstore provides an efficient in-memory time-series metric storage system\n7\t// with support for hierarchical data organization, checkpointing, and archiving.\n8\t//\n9\t// The package organizes metrics in a tree structure (cluster → host → component) and\n10\t// provides concurrent read/write access to metric data with configurable aggregation strategies.\n11\t// Background goroutines handle periodic checkpointing (JSON or WAL/binary format), archiving old data,\n12\t// and enforcing retention policies.\n13\t//\n14\t// Key features:\n15\t//   - In-memory metric storage with configurable retention\n16\t//   - Hierarchical data organization (selectors)\n17\t//   - Concurrent checkpoint/archive workers\n18\t//   - Support for sum and average aggregation\n19\t//   - NATS integration for metric ingestion via InfluxDB line protocol\n20\tpackage metricstore\n21\t\n22\timport (\n23\t\t\"bytes\"\n24\t\t\"context\"\n25\t\t\"encoding/json\"\n26\t\t\"errors\"\n27\t\t\"fmt\"\n28\t\t\"runtime\"\n29\t\t\"runtime/debug\"\n30\t\t\"slices\"\n31\t\t\"sync\"\n32\t\t\"time\"\n33\t\n34\t\t\"github.com/ClusterCockpit/cc-backend/internal/config\"\n35\t\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n36\t\t\"github.com/ClusterCockpit/cc-lib/v2/resampler\"\n37\t\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n38\t\t\"github.com/ClusterCockpit/cc-lib/v2/util\"\n39\t)\n40\t\n41\t// GlobalState holds the global state for the metric store with thread-safe access.\n42\ttype GlobalState struct {\n43\t\tmu                sync.RWMutex\n44\t\tlastRetentionTime int64\n45\t\tselectorsExcluded bool\n46\t}\n47\t\n48\tvar (\n49\t\tsingleton  sync.Once\n50\t\tmsInstance *MemoryStore\n51\t\t// shutdownFunc stores the context cancellation function created in Init\n52\t\t// and is called during Shutdown to cancel all background goroutines\n53\t\tshutdownFunc   context.CancelFunc\n54\t\tshutdownFuncMu sync.Mutex // Protects shutdownFunc from concurrent access\n55\t\t// Create a global instance\n56\t\tstate = &GlobalState{}\n57\t)\n58\t\n59\t// NodeProvider provides information about nodes currently in use by running jobs.\n60\t//\n61\t// This interface allows metricstore to query job information without directly\n62\t// depending on the repository package, breaking the import cycle.\n63\t//\n64\t// Implementations should return nodes that are actively processing jobs started\n65\t// before the given timestamp. These nodes will be excluded from retention-based\n66\t// garbage collection to prevent data loss for jobs that are still running or\n67\t// recently completed.\n68\ttype NodeProvider interface {\n69\t\t// GetUsedNodes returns a map of cluster names to sorted lists of unique hostnames\n70\t\t// that are currently in use by jobs that started before the given timestamp.\n71\t\t//\n72\t\t// Parameters:\n73\t\t//   - ts: Unix timestamp threshold - returns nodes with jobs started before this time\n74\t\t//\n75\t\t// Returns:\n76\t\t//   - Map of cluster names to lists of node hostnames that should be excluded from garbage collection\n77\t\t//   - Error if the query fails\n78\t\tGetUsedNodes(ts int64) (map[string][]string, error)\n79\t}\n80\t\n81\t// Metric represents a single metric data point to be written to the store.\n82\ttype Metric struct {\n83\t\tName  string\n84\t\tValue schema.Float\n85\t\t// MetricConfig contains frequency and aggregation settings for this metric.\n86\t\t// If Frequency is 0, configuration will be looked up from MemoryStore.Metrics during Write().\n87\t\tMetricConfig MetricConfig\n88\t}\n89\t\n90\t// MemoryStore is the main in-memory time-series metric storage implementation.\n91\t//\n92\t// It organizes metrics in a hierarchical tree structure where each level represents\n93\t// a component of the system hierarchy (e.g., cluster → host → CPU). Each level can\n94\t// store multiple metrics as time-series buffers.\n95\t//\n96\t// The store is initialized as a singleton via InitMetrics() and accessed via GetMemoryStore().\n97\t// All public methods are safe for concurrent use.\n98\ttype MemoryStore struct {\n99\t\tMetrics      map[string]MetricConfig\n100\t\troot         Level\n101\t\tnodeProvider NodeProvider\n102\t}\n103\t\n104\t// Init initializes the metric store from configuration and starts background workers.\n105\t//\n106\t// This function must be called exactly once before any other metricstore operations.\n107\t// It performs the following initialization steps:\n108\t//  1. Validates and decodes the metric store configuration\n109\t//  2. Configures worker pool size (defaults to NumCPU/2+1, max 10)\n110\t//  3. Loads metric configurations from all registered clusters\n111\t//  4. Restores checkpoints within the retention window\n112\t//  5. Starts background workers for retention, checkpointing, archiving, and monitoring\n113\t//  6. Optionally subscribes to NATS for real-time metric ingestion\n114\t//\n115\t// Parameters:\n116\t//   - rawConfig: JSON configuration for the metric store (see MetricStoreConfig); may be nil to use defaults\n117\t//   - metrics: Map of metric names to their configurations (frequency and aggregation strategy)\n118\t//   - wg: WaitGroup that will be incremented for each background goroutine started\n119\t//\n120\t// The function will call cclog.Fatal on critical errors during initialization.\n121\t// Use Shutdown() to cleanly stop all background workers started by Init().\n122\t//\n123\t// Note: Signal handling must be implemented by the caller. Call Shutdown() when\n124\t// receiving termination signals to ensure checkpoint data is persisted.\n125\tfunc Init(rawConfig json.RawMessage, metrics map[string]MetricConfig, wg *sync.WaitGroup) {\n126\t\tstartupTime := time.Now()\n127\t\n128\t\tif rawConfig != nil {\n129\t\t\tconfig.Validate(configSchema, rawConfig)\n130\t\t\tdec := json.NewDecoder(bytes.NewReader(rawConfig))\n131\t\t\tdec.DisallowUnknownFields()\n132\t\t\tif err := dec.Decode(&Keys); err != nil {\n133\t\t\t\tcclog.Abortf(\"[METRICSTORE]> Metric Store Config Init: Could not decode config file '%s'.\\nError: %s\\n\", rawConfig, err.Error())\n134\t\t\t}\n135\t\t}\n136\t\n137\t\t// Set NumWorkers from config or use default\n138\t\tif Keys.NumWorkers <= 0 {\n139\t\t\tKeys.NumWorkers = min(runtime.NumCPU()/2+1, DefaultMaxWorkers)\n140\t\t}\n141\t\tcclog.Debugf(\"[METRICSTORE]> Using %d workers for checkpoint/archive operations\\n\", Keys.NumWorkers)\n142\t\n143\t\t// Pass the config.MetricStoreKeys\n144\t\tInitMetrics(metrics)\n145\t\n146\t\tms := GetMemoryStore()\n147\t\n148\t\td, err := time.ParseDuration(Keys.RetentionInMemory)\n149\t\tif err != nil {\n150\t\t\tcclog.Fatal(err)\n151\t\t}\n152\t\n153\t\trestoreFrom := startupTime.Add(-d)\n154\t\tcclog.Infof(\"[METRICSTORE]> Loading checkpoints newer than %s\\n\", restoreFrom.Format(time.RFC3339))\n155\t\tfiles, err := ms.FromCheckpointFiles(Keys.Checkpoints.RootDir, restoreFrom.Unix())\n156\t\tloadedData := ms.SizeInBytes() / 1024 / 1024 // In MB\n157\t\tif err != nil {\n158\t\t\tcclog.Fatalf(\"[METRICSTORE]> Loading checkpoints failed: %s\\n\", err.Error())\n159\t\t} else {\n160\t\t\tcclog.Infof(\"[METRICSTORE]> Checkpoints loaded (%d files, %d MB, that took %fs)\\n\", files, loadedData, time.Since(startupTime).Seconds())\n161\t\t}\n162\t\n163\t\t// Try to use less memory by forcing a GC run here and then\n164\t\t// lowering the target percentage. The default of 100 means\n165\t\t// that only once the ratio of new allocations execeds the\n166\t\t// previously active heap, a GC is triggered.\n167\t\t// Forcing a GC here will set the \"previously active heap\"\n168\t\t// to a minumum.\n169\t\t// runtime.GC()\n170\t\n171\t\tctx, shutdown := context.WithCancel(context.Background())\n172\t\n173\t\tRetention(wg, ctx)\n174\t\tCheckpointing(wg, ctx)\n175\t\tCleanUp(wg, ctx)\n176\t\tWALStaging(wg, ctx)\n177\t\tMemoryUsageTracker(wg, ctx)\n178\t\n179\t\t// Note: Signal handling has been removed from this function.\n180\t\t// The caller is responsible for handling shutdown signals and calling\n181\t\t// the shutdown() function when appropriate.\n182\t\t// Store the shutdown function for later use by Shutdown()\n183\t\tshutdownFuncMu.Lock()\n184\t\tshutdownFunc = shutdown\n185\t\tshutdownFuncMu.Unlock()\n186\t\n187\t\tif Keys.Subscriptions != nil {\n188\t\t\twg.Go(func() {\n189\t\t\t\tif err := ReceiveNats(ms, Keys.NumWorkers, ctx); err != nil {\n190\t\t\t\t\tcclog.Fatal(err)\n191\t\t\t\t}\n192\t\t\t})\n193\t\t}\n194\t}\n195\t\n196\t// InitMetrics initializes the singleton MemoryStore instance with the given metric configurations.\n197\t//\n198\t// This function must be called before GetMemoryStore() and can only be called once due to\n199\t// the singleton pattern. It assigns each metric an internal offset for efficient buffer indexing.\n200\t//\n201\t// Parameters:\n202\t//   - metrics: Map of metric names to their configurations (frequency and aggregation strategy)\n203\t//\n204\t// Panics if any metric has Frequency == 0, which indicates an invalid configuration.\n205\t//\n206\t// After this call, the global msInstance is ready for use via GetMemoryStore().\n207\tfunc InitMetrics(metrics map[string]MetricConfig) {\n208\t\tsingleton.Do(func() {\n209\t\t\toffset := 0\n210\t\t\tfor key, cfg := range metrics {\n211\t\t\t\tif cfg.Frequency == 0 {\n212\t\t\t\t\tpanic(\"[METRICSTORE]> invalid frequency\")\n213\t\t\t\t}\n214\t\n215\t\t\t\tmetrics[key] = MetricConfig{\n216\t\t\t\t\tFrequency:   cfg.Frequency,\n217\t\t\t\t\tAggregation: cfg.Aggregation,\n218\t\t\t\t\toffset:      offset,\n219\t\t\t\t}\n220\t\t\t\toffset += 1\n221\t\t\t}\n222\t\n223\t\t\tmsInstance = &MemoryStore{\n224\t\t\t\troot: Level{\n225\t\t\t\t\tmetrics:  make([]*buffer, len(metrics)),\n226\t\t\t\t\tchildren: make(map[string]*Level),\n227\t\t\t\t},\n228\t\t\t\tMetrics: metrics,\n229\t\t\t}\n230\t\t})\n231\t}\n232\t\n233\t// GetMemoryStore returns the singleton MemoryStore instance.\n234\t//\n235\t// Returns the initialized MemoryStore singleton. Calls cclog.Fatal if InitMetrics() was not called first.\n236\t//\n237\t// This function is safe for concurrent use after initialization.\n238\tfunc GetMemoryStore() *MemoryStore {\n239\t\tif msInstance == nil {\n240\t\t\tcclog.Warnf(\"[METRICSTORE]> MemoryStore not initialized!\")\n241\t\t}\n242\t\n243\t\treturn msInstance\n244\t}\n245\t\n246\tfunc (ms *MemoryStore) GetMetricFrequency(metricName string) (int64, error) {\n247\t\tif metric, ok := ms.Metrics[metricName]; ok {\n248\t\t\treturn metric.Frequency, nil\n249\t\t}\n250\t\treturn 0, fmt.Errorf(\"[METRICSTORE]> metric %s not found\", metricName)\n251\t}\n252\t\n253\t// SetNodeProvider sets the NodeProvider implementation for the MemoryStore.\n254\t// This must be called during initialization to provide job state information\n255\t// for selective buffer retention during Free operations.\n256\t// If not set, the Free function will fall back to freeing all buffers.\n257\tfunc (ms *MemoryStore) SetNodeProvider(provider NodeProvider) {\n258\t\tms.nodeProvider = provider\n259\t}\n260\t\n261\t// Shutdown performs a graceful shutdown of the metric store.\n262\t//\n263\t// This function cancels all background goroutines started by Init() and writes\n264\t// a final checkpoint to disk before returning. It should be called when the\n265\t// application receives a termination signal.\n266\t//\n267\t// The function will:\n268\t//  1. Cancel the context to stop all background workers\n269\t//  2. Close the WAL messages channel if using WAL format\n270\t//  3. Write a final checkpoint to preserve in-memory data\n271\t//  4. Log any errors encountered during shutdown\n272\t//\n273\t// Note: This function blocks until the final checkpoint is written.\n274\tfunc Shutdown() {\n275\t\ttotalStart := time.Now()\n276\t\n277\t\tshutdownFuncMu.Lock()\n278\t\tdefer shutdownFuncMu.Unlock()\n279\t\tif shutdownFunc != nil {\n280\t\t\tshutdownFunc()\n281\t\t}\n282\t\tcclog.Infof(\"[METRICSTORE]> Background workers cancelled (%v)\", time.Since(totalStart))\n283\t\n284\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n285\t\t\t// Signal producers to stop sending before closing channels,\n286\t\t\t// preventing send-on-closed-channel panics from in-flight NATS workers.\n287\t\t\twalShuttingDown.Store(true)\n288\t\t\t// Brief grace period for in-flight DecodeLine calls to complete.\n289\t\t\ttime.Sleep(100 * time.Millisecond)\n290\t\n291\t\t\tfor _, ch := range walShardChs {\n292\t\t\t\tclose(ch)\n293\t\t\t}\n294\t\t\tdrainStart := time.Now()\n295\t\t\tWaitForWALStagingDrain()\n296\t\t\tcclog.Infof(\"[METRICSTORE]> WAL staging goroutines exited (%v)\", time.Since(drainStart))\n297\t\t}\n298\t\n299\t\tcclog.Infof(\"[METRICSTORE]> Writing checkpoint to '%s'...\", Keys.Checkpoints.RootDir)\n300\t\tcheckpointStart := time.Now()\n301\t\tvar files int\n302\t\tvar err error\n303\t\n304\t\tms := GetMemoryStore()\n305\t\n306\t\tlastCheckpointMu.Lock()\n307\t\tfrom := lastCheckpoint\n308\t\tlastCheckpointMu.Unlock()\n309\t\n310\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n311\t\t\t// WAL files are deleted per-host inside ToCheckpointWAL workers.\n312\t\t\tfiles, _, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n313\t\t} else {\n314\t\t\tfiles, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n315\t\t}\n316\t\n317\t\tif err != nil {\n318\t\t\tcclog.Errorf(\"[METRICSTORE]> Writing checkpoint failed: %s\", err.Error())\n319\t\t}\n320\t\tcclog.Infof(\"[METRICSTORE]> Done! (%d files written in %v, total shutdown: %v)\", files, time.Since(checkpointStart), time.Since(totalStart))\n321\t}\n322\t\n323\t// Retention starts a background goroutine that periodically frees old metric data.\n324\t//\n325\t// This worker runs at half the retention interval and calls Free() to remove buffers\n326\t// older than the configured retention time. It respects the NodeProvider to preserve\n327\t// data for nodes with active jobs.\n328\t//\n329\t// Parameters:\n330\t//   - wg: WaitGroup to signal completion when context is cancelled\n331\t//   - ctx: Context for cancellation signal\n332\t//\n333\t// The goroutine exits when ctx is cancelled.\n334\tfunc Retention(wg *sync.WaitGroup, ctx context.Context) {\n335\t\tms := GetMemoryStore()\n336\t\n337\t\twg.Go(func() {\n338\t\t\td, err := time.ParseDuration(Keys.RetentionInMemory)\n339\t\t\tif err != nil {\n340\t\t\t\tcclog.Fatal(err)\n341\t\t\t}\n342\t\t\tif d <= 0 {\n343\t\t\t\treturn\n344\t\t\t}\n345\t\n346\t\t\ttickInterval := d / 2\n347\t\t\tif tickInterval <= 0 {\n348\t\t\t\treturn\n349\t\t\t}\n350\t\t\tticker := time.NewTicker(tickInterval)\n351\t\t\tdefer ticker.Stop()\n352\t\n353\t\t\tfor {\n354\t\t\t\tselect {\n355\t\t\t\tcase <-ctx.Done():\n356\t\t\t\t\treturn\n357\t\t\t\tcase <-ticker.C:\n358\t\t\t\t\tstate.mu.Lock()\n359\t\n360\t\t\t\t\tt := time.Now().Add(-d)\n361\t\n362\t\t\t\t\tstate.lastRetentionTime = t.Unix()\n363\t\n364\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> start freeing buffers (older than %s)...\\n\", t.Format(time.RFC3339))\n365\t\n366\t\t\t\t\tfreed, err := Free(ms, t)\n367\t\t\t\t\tif err != nil {\n368\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> freeing up buffers failed: %s\\n\", err.Error())\n369\t\t\t\t\t} else {\n370\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d buffers freed\\n\", freed)\n371\t\t\t\t\t}\n372\t\n373\t\t\t\t\tstate.mu.Unlock()\n374\t\n375\t\t\t\t\t// Clean up the buffer pool\n376\t\t\t\t\tbufferPool.Clean(state.lastRetentionTime)\n377\t\t\t\t}\n378\t\t\t}\n379\t\t})\n380\t}\n381\t\n382\t// MemoryUsageTracker starts a background goroutine that monitors memory usage.\n383\t//\n384\t// This worker checks actual process memory usage (via runtime.MemStats) periodically\n385\t// and force-frees buffers if memory exceeds the configured cap. It uses FreeOSMemory()\n386\t// to return memory to the OS after freeing buffers, avoiding aggressive GC that causes\n387\t// performance issues.\n388\t//\n389\t// The tracker logs both actual memory usage (heap allocated) and metric data size for\n390\t// visibility into memory overhead from Go runtime structures and allocations.\n391\t//\n392\t// Parameters:\n393\t//   - wg: WaitGroup to signal completion when context is cancelled\n394\t//   - ctx: Context for cancellation signal\n395\t//\n396\t// The goroutine exits when ctx is cancelled.\n397\tfunc MemoryUsageTracker(wg *sync.WaitGroup, ctx context.Context) {\n398\t\tms := GetMemoryStore()\n399\t\n400\t\twg.Go(func() {\n401\t\t\tnormalInterval := DefaultMemoryUsageTrackerInterval\n402\t\t\tfastInterval := 30 * time.Second\n403\t\n404\t\t\tif normalInterval <= 0 {\n405\t\t\t\treturn\n406\t\t\t}\n407\t\n408\t\t\tticker := time.NewTicker(normalInterval)\n409\t\t\tdefer ticker.Stop()\n410\t\t\tcurrentInterval := normalInterval\n411\t\n412\t\t\tfor {\n413\t\t\t\tselect {\n414\t\t\t\tcase <-ctx.Done():\n415\t\t\t\t\treturn\n416\t\t\t\tcase <-ticker.C:\n417\t\t\t\t\tvar mem runtime.MemStats\n418\t\t\t\t\truntime.ReadMemStats(&mem)\n419\t\t\t\t\tactualMemoryGB := float64(mem.Alloc) / 1e9\n420\t\t\t\t\tmetricDataGB := ms.SizeInGB()\n421\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory usage: %.2f GB actual (%.2f GB metric data)\", actualMemoryGB, metricDataGB)\n422\t\n423\t\t\t\t\tfreedExcluded := 0\n424\t\t\t\t\tfreedEmergency := 0\n425\t\t\t\t\tvar err error\n426\t\n427\t\t\t\t\tstate.mu.RLock()\n428\t\t\t\t\tlastRetention := state.lastRetentionTime\n429\t\t\t\t\tselectorsExcluded := state.selectorsExcluded\n430\t\t\t\t\tstate.mu.RUnlock()\n431\t\n432\t\t\t\t\tif lastRetention != 0 && selectorsExcluded {\n433\t\t\t\t\t\tfreedExcluded, err = ms.Free(nil, lastRetention)\n434\t\t\t\t\t\tif err != nil {\n435\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while force-freeing the excluded buffers: %s\", err)\n436\t\t\t\t\t\t}\n437\t\n438\t\t\t\t\t\tif freedExcluded > 0 {\n439\t\t\t\t\t\t\tdebug.FreeOSMemory()\n440\t\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d excluded buffers force-freed\", freedExcluded)\n441\t\t\t\t\t\t}\n442\t\t\t\t\t}\n443\t\n444\t\t\t\t\truntime.ReadMemStats(&mem)\n445\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n446\t\n447\t\t\t\t\tif actualMemoryGB > float64(Keys.MemoryCap) {\n448\t\t\t\t\t\tcclog.Warnf(\"[METRICSTORE]> memory usage %.2f GB exceeds cap %d GB, starting emergency buffer freeing\", actualMemoryGB, Keys.MemoryCap)\n449\t\n450\t\t\t\t\t\t// Use progressive time-based Free with increasing threshold\n451\t\t\t\t\t\t// instead of ForceFree loop — fewer tree traversals, more effective\n452\t\t\t\t\t\td, parseErr := time.ParseDuration(Keys.RetentionInMemory)\n453\t\t\t\t\t\tif parseErr != nil {\n454\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> cannot parse retention duration: %s\", parseErr)\n455\t\t\t\t\t\t} else {\n456\t\t\t\t\t\t\tthresholds := []float64{0.75, 0.5, 0.25}\n457\t\t\t\t\t\t\tfor _, fraction := range thresholds {\n458\t\t\t\t\t\t\t\tthreshold := time.Now().Add(-time.Duration(float64(d) * fraction))\n459\t\t\t\t\t\t\t\tfreed, freeErr := ms.Free(nil, threshold.Unix())\n460\t\t\t\t\t\t\t\tif freeErr != nil {\n461\t\t\t\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while freeing buffers at %.0f%% retention: %s\", fraction*100, freeErr)\n462\t\t\t\t\t\t\t\t}\n463\t\t\t\t\t\t\t\tfreedEmergency += freed\n464\t\n465\t\t\t\t\t\t\t\tbufferPool.Clear()\n466\t\t\t\t\t\t\t\truntime.GC()\n467\t\t\t\t\t\t\t\truntime.ReadMemStats(&mem)\n468\t\t\t\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n469\t\n470\t\t\t\t\t\t\t\tif actualMemoryGB < float64(Keys.MemoryCap) {\n471\t\t\t\t\t\t\t\t\tbreak\n472\t\t\t\t\t\t\t\t}\n473\t\t\t\t\t\t\t}\n474\t\t\t\t\t\t}\n475\t\n476\t\t\t\t\t\tbufferPool.Clear()\n477\t\t\t\t\t\tdebug.FreeOSMemory()\n478\t\n479\t\t\t\t\t\truntime.ReadMemStats(&mem)\n480\t\t\t\t\t\tactualMemoryGB = float64(mem.Alloc) / 1e9\n481\t\n482\t\t\t\t\t\tif actualMemoryGB >= float64(Keys.MemoryCap) {\n483\t\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)\n484\t\t\t\t\t\t} else {\n485\t\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> emergency freeing complete: %d buffers freed, memory now %.2f GB\", freedEmergency, actualMemoryGB)\n486\t\t\t\t\t\t}\n487\t\t\t\t\t}\n488\t\n489\t\t\t\t\t// Adaptive ticker: check more frequently when memory is high\n490\t\t\t\t\tmemoryRatio := actualMemoryGB / float64(Keys.MemoryCap)\n491\t\t\t\t\tif memoryRatio > 0.8 && currentInterval != fastInterval {\n492\t\t\t\t\t\tticker.Reset(fastInterval)\n493\t\t\t\t\t\tcurrentInterval = fastInterval\n494\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to fast check interval (30s)\", memoryRatio*100)\n495\t\t\t\t\t} else if memoryRatio <= 0.8 && currentInterval != normalInterval {\n496\t\t\t\t\t\tticker.Reset(normalInterval)\n497\t\t\t\t\t\tcurrentInterval = normalInterval\n498\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> memory at %.0f%% of cap, switching to normal check interval\", memoryRatio*100)\n499\t\t\t\t\t}\n500\t\t\t\t}\n501\t\t\t}\n502\t\t})\n503\t}\n504\t\n505\t// Free removes metric data older than the given time while preserving data for active nodes.\n506\t//\n507\t// This function implements intelligent retention by consulting the NodeProvider (if configured)\n508\t// to determine which nodes are currently in use by running jobs. Data for these nodes is\n509\t// preserved even if older than the retention time.\n510\t//\n511\t// Parameters:\n512\t//   - ms: The MemoryStore instance\n513\t//   - t: Time threshold - buffers with data older than this will be freed\n514\t//\n515\t// Returns:\n516\t//   - Number of buffers freed\n517\t//   - Error if NodeProvider query fails\n518\t//\n519\t// Behavior:\n520\t//   - If no NodeProvider is set: frees all buffers older than t\n521\t//   - If NodeProvider returns empty map: frees all buffers older than t\n522\t//   - Otherwise: preserves buffers for nodes returned by GetUsedNodes(), frees others\n523\tfunc Free(ms *MemoryStore, t time.Time) (int, error) {\n524\t\t// If no NodeProvider is configured, free all buffers older than t\n525\t\tif ms.nodeProvider == nil {\n526\t\t\treturn ms.Free(nil, t.Unix())\n527\t\t}\n528\t\n529\t\texcludeSelectors, err := ms.nodeProvider.GetUsedNodes(t.Unix())\n530\t\tif err != nil {\n531\t\t\treturn 0, err\n532\t\t}\n533\t\n534\t\tswitch lenMap := len(excludeSelectors); lenMap {\n535\t\n536\t\t// If the length of the map returned by GetUsedNodes() is 0,\n537\t\t// then use default Free method with nil selector\n538\t\tcase 0:\n539\t\t\tstate.selectorsExcluded = false\n540\t\t\treturn ms.Free(nil, t.Unix())\n541\t\n542\t\t// Else formulate selectors, exclude those from the map\n543\t\t// and free the rest of the selectors\n544\t\tdefault:\n545\t\t\tstate.selectorsExcluded = true\n546\t\t\tselectors := GetSelectors(ms, excludeSelectors)\n547\t\t\treturn FreeSelected(ms, selectors, t)\n548\t\t}\n549\t}\n550\t\n551\t// FreeSelected frees buffers for specific selectors while preserving others.\n552\t//\n553\t// This function is used when we want to retain some specific nodes beyond the retention time.\n554\t// It iterates through the provided selectors and frees their associated buffers.\n555\t//\n556\t// Parameters:\n557\t//   - ms: The MemoryStore instance\n558\t//   - selectors: List of selector paths to free (e.g., [[\"cluster1\", \"node1\"], [\"cluster2\", \"node2\"]])\n559\t//   - t: Time threshold for freeing buffers\n560\t//\n561\t// Returns the total number of buffers freed and any error encountered.\n562\tfunc FreeSelected(ms *MemoryStore, selectors [][]string, t time.Time) (int, error) {\n563\t\tfreed := 0\n564\t\n565\t\tfor _, selector := range selectors {\n566\t\n567\t\t\tfreedBuffers, err := ms.Free(selector, t.Unix())\n568\t\t\tif err != nil {\n569\t\t\t\tcclog.Errorf(\"error while freeing selected buffers: %#v\", err)\n570\t\t\t}\n571\t\t\tfreed += freedBuffers\n572\t\n573\t\t}\n574\t\n575\t\treturn freed, nil\n576\t}\n577\t\n578\t// GetSelectors returns all selectors at depth 2 (cluster/node level) that are NOT in the exclusion map.\n579\t//\n580\t// This function generates a list of selectors whose buffers should be freed by excluding\n581\t// selectors that correspond to nodes currently in use by running jobs.\n582\t//\n583\t// Parameters:\n584\t//   - ms: The MemoryStore instance\n585\t//   - excludeSelectors: Map of cluster names to node hostnames that should NOT be freed\n586\t//\n587\t// Returns a list of selectors ([]string paths) that can be safely freed.\n588\t//\n589\t// Example:\n590\t//\n591\t//\tIf the tree has paths [\"emmy\", \"node001\"] and [\"emmy\", \"node002\"],\n592\t//\tand excludeSelectors contains {\"emmy\": [\"node001\"]},\n593\t//\tthen only [[\"emmy\", \"node002\"]] is returned.\n594\tfunc GetSelectors(ms *MemoryStore, excludeSelectors map[string][]string) [][]string {\n595\t\tallSelectors := ms.GetPaths(2)\n596\t\n597\t\tfilteredSelectors := make([][]string, 0, len(allSelectors))\n598\t\n599\t\tfor _, path := range allSelectors {\n600\t\t\tif len(path) < 2 {\n601\t\t\t\tcontinue\n602\t\t\t}\n603\t\n604\t\t\tkey := path[0]   // The \"Key\" (Level 1)\n605\t\t\tvalue := path[1] // The \"Value\" (Level 2)\n606\t\n607\t\t\texclude := false\n608\t\n609\t\t\t// Check if the key exists in our exclusion map\n610\t\t\tif excludedValues, exists := excludeSelectors[key]; exists {\n611\t\t\t\t// The key exists, now check if the specific value is in the exclusion list\n612\t\t\t\tif slices.Contains(excludedValues, value) {\n613\t\t\t\t\texclude = true\n614\t\t\t\t}\n615\t\t\t}\n616\t\n617\t\t\tif !exclude {\n618\t\t\t\tfilteredSelectors = append(filteredSelectors, path)\n619\t\t\t}\n620\t\t}\n621\t\n622\t\treturn filteredSelectors\n623\t}\n624\t\n625\t// GetPaths returns a list of lists (paths) to the specified depth.\n626\tfunc (ms *MemoryStore) GetPaths(targetDepth int) [][]string {\n627\t\tvar results [][]string\n628\t\n629\t\t// Start recursion. Initial path is empty.\n630\t\t// We treat Root as depth 0.\n631\t\tms.root.collectPaths(0, targetDepth, []string{}, &results)\n632\t\n633\t\treturn results\n634\t}\n635\t\n636\t// Write all values in `metrics` to the level specified by `selector` for time `ts`.\n637\t// Look at `findLevelOrCreate` for how selectors work.\n638\tfunc (m *MemoryStore) Write(selector []string, ts int64, metrics []Metric) error {\n639\t\tvar ok bool\n640\t\tfor i, metric := range metrics {\n641\t\t\tif metric.MetricConfig.Frequency == 0 {\n642\t\t\t\tmetric.MetricConfig, ok = m.Metrics[metric.Name]\n643\t\t\t\tif !ok {\n644\t\t\t\t\tcclog.Debugf(\"[METRICSTORE]> Unknown metric '%s' in Write() - skipping\", metric.Name)\n645\t\t\t\t\tmetric.MetricConfig.Frequency = 0\n646\t\t\t\t}\n647\t\t\t\tmetrics[i] = metric\n648\t\t\t}\n649\t\t}\n650\t\n651\t\treturn m.WriteToLevel(&m.root, selector, ts, metrics)\n652\t}\n653\t\n654\tfunc (m *MemoryStore) GetLevel(selector []string) *Level {\n655\t\treturn m.root.findLevelOrCreate(selector, len(m.Metrics))\n656\t}\n657\t\n658\t// WriteToLevel assumes that `minfo` in `metrics` is filled in\n659\tfunc (m *MemoryStore) WriteToLevel(l *Level, selector []string, ts int64, metrics []Metric) error {\n660\t\tl = l.findLevelOrCreate(selector, len(m.Metrics))\n661\t\tl.lock.Lock()\n662\t\tdefer l.lock.Unlock()\n663\t\n664\t\tfor _, metric := range metrics {\n665\t\t\tif metric.MetricConfig.Frequency == 0 {\n666\t\t\t\tcontinue\n667\t\t\t}\n668\t\n669\t\t\tb := l.metrics[metric.MetricConfig.offset]\n670\t\t\tif b == nil {\n671\t\t\t\t// First write to this metric and level\n672\t\t\t\tb = newBuffer(ts, metric.MetricConfig.Frequency)\n673\t\t\t\tl.metrics[metric.MetricConfig.offset] = b\n674\t\t\t}\n675\t\n676\t\t\tnb, err := b.write(ts, metric.Value)\n677\t\t\tif err != nil {\n678\t\t\t\treturn err\n679\t\t\t}\n680\t\n681\t\t\t// Last write created a new buffer...\n682\t\t\tif b != nb {\n683\t\t\t\tl.metrics[metric.MetricConfig.offset] = nb\n684\t\t\t}\n685\t\t}\n686\t\treturn nil\n687\t}\n688\t\n689\t// Read returns all values for metric `metric` from `from` to `to` for the selected level(s).\n690\t// If the level does not hold the metric itself, the data will be aggregated recursively from the children.\n691\t// The second and third return value are the actual from/to for the data. Those can be different from\n692\t// the range asked for if no data was available.\n693\tfunc (m *MemoryStore) Read(selector util.Selector, metric string, from, to, resolution int64) ([]schema.Float, int64, int64, int64, error) {\n694\t\tif from > to {\n695\t\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> invalid time range\")\n696\t\t}\n697\t\n698\t\tminfo, ok := m.Metrics[metric]\n699\t\tif !ok {\n700\t\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> unknown metric: \" + metric)\n701\t\t}\n702\t\n703\t\tn, data := 0, make([]schema.Float, (to-from)/minfo.Frequency+1)\n704\t\n705\t\terr := m.root.findBuffers(selector, minfo.offset, func(b *buffer) error {\n706\t\t\tcdata, cfrom, cto, err := b.read(from, to, data)\n707\t\t\tif err != nil {\n708\t\t\t\treturn err\n709\t\t\t}\n710\t\n711\t\t\tif n == 0 {\n712\t\t\t\tfrom, to = cfrom, cto\n713\t\t\t} else if from != cfrom || to != cto || len(data) != len(cdata) {\n714\t\t\t\tmissingfront, missingback := int((from-cfrom)/minfo.Frequency), int((to-cto)/minfo.Frequency)\n715\t\t\t\tif missingfront != 0 {\n716\t\t\t\t\treturn ErrDataDoesNotAlignMissingFront\n717\t\t\t\t}\n718\t\n719\t\t\t\tnewlen := len(cdata) - missingback\n720\t\t\t\tif newlen < 1 {\n721\t\t\t\t\treturn ErrDataDoesNotAlignMissingBack\n722\t\t\t\t}\n723\t\t\t\tcdata = cdata[0:newlen]\n724\t\t\t\tif len(cdata) != len(data) {\n725\t\t\t\t\treturn ErrDataDoesNotAlignDataLenMismatch\n726\t\t\t\t}\n727\t\n728\t\t\t\tfrom, to = cfrom, cto\n729\t\t\t}\n730\t\n731\t\t\tdata = cdata\n732\t\t\tn += 1\n733\t\t\treturn nil\n734\t\t})\n735\t\n736\t\tif err != nil {\n737\t\t\treturn nil, 0, 0, 0, err\n738\t\t} else if n == 0 {\n739\t\t\treturn nil, 0, 0, 0, ErrNoHostOrMetric\n740\t\t} else if n > 1 {\n741\t\t\tif minfo.Aggregation == AvgAggregation {\n742\t\t\t\tnormalize := 1. / schema.Float(n)\n743\t\t\t\tfor i := 0; i < len(data); i++ {\n744\t\t\t\t\tdata[i] *= normalize\n745\t\t\t\t}\n746\t\t\t} else if minfo.Aggregation != SumAggregation {\n747\t\t\t\treturn nil, 0, 0, 0, errors.New(\"[METRICSTORE]> invalid aggregation\")\n748\t\t\t}\n749\t\t}\n750\t\n751\t\tdata, resolution, err = resampler.LargestTriangleThreeBucket(data, minfo.Frequency, resolution)\n752\t\tif err != nil {\n753\t\t\treturn nil, 0, 0, 0, err\n754\t\t}\n755\t\n756\t\treturn data, from, to, resolution, nil\n757\t}\n758\t\n759\t// Free releases all buffers for the selected level and all its children that\n760\t// contain only values older than `t`.\n761\tfunc (m *MemoryStore) Free(selector []string, t int64) (int, error) {\n762\t\treturn m.GetLevel(selector).free(t)\n763\t}\n764\t\n765\t// ForceFree unconditionally removes the oldest buffer from each metric chain.\n766\tfunc (m *MemoryStore) ForceFree() (int, error) {\n767\t\treturn m.GetLevel(nil).forceFree()\n768\t}\n769\t\n770\tfunc (m *MemoryStore) FreeAll() error {\n771\t\tm.root.lock.Lock()\n772\t\tdefer m.root.lock.Unlock()\n773\t\n774\t\tfor k := range m.root.children {\n775\t\t\tdelete(m.root.children, k)\n776\t\t}\n777\t\n778\t\treturn nil\n779\t}\n780\t\n781\tfunc (m *MemoryStore) SizeInBytes() int64 {\n782\t\treturn m.root.sizeInBytes()\n783\t}\n784\t\n785\tfunc (m *MemoryStore) SizeInGB() float64 {\n786\t\treturn float64(m.root.sizeInBytes()) / 1e9\n787\t}\n788\t\n789\t// ListChildren , given a selector, returns a list of all children of the level\n790\t// selected.\n791\tfunc (m *MemoryStore) ListChildren(selector []string) []string {\n792\t\tlvl := &m.root\n793\t\tfor lvl != nil && len(selector) != 0 {\n794\t\t\tlvl.lock.RLock()\n795\t\t\tnext := lvl.children[selector[0]]\n796\t\t\tlvl.lock.RUnlock()\n797\t\t\tlvl = next\n798\t\t\tselector = selector[1:]\n799\t\t}\n800\t\n801\t\tif lvl == nil {\n802\t\t\treturn nil\n803\t\t}\n804\t\n805\t\tlvl.lock.RLock()\n806\t\tdefer lvl.lock.RUnlock()\n807\t\n808\t\tchildren := make([]string, 0, len(lvl.children))\n809\t\tfor child := range lvl.children {\n810\t\t\tchildren = append(children, child)\n811\t\t}\n812\t\n813\t\treturn children\n814\t}\n815\t"}]},"uuid":"7f284098-1eca-498d-991e-7fd1353b0a8a","timestamp":"2026-06-05T06:33:19.757Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/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 WAL/binary 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 via InfluxDB line protocol\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); may be nil to use defaults\n//   - metrics: Map of metric names to their configurations (frequency and aggregation strategy)\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","numLines":815,"startLine":1,"totalLines":815}},"sourceToolAssistantUUID":"e71a0228-2857-47ba-8749-e7d6dc6df98c","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
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If the calculated index\n197\t// exceeds capacity, a new buffer is allocated and linked as the new head.\n198\t//\n199\t// Missing timestamps are automatically filled with NaN values to maintain alignment.\n200\t// Overwrites are allowed if the index is already within the existing data slice.\n201\t//\n202\t// Parameters:\n203\t//   - ts:    Unix timestamp in seconds\n204\t//   - value: Metric value (can be schema.NaN for missing data)\n205\t//\n206\t// Returns:\n207\t//   - *buffer: The new head buffer (same as b if no new buffer created)\n208\t//   - error:   Non-nil if timestamp is before buffer start\n209\tfunc (b *buffer) write(ts int64, value schema.Float) (*buffer, error) {\n210\t\tif ts < b.start {\n211\t\t\treturn nil, errors.New(\"[METRICSTORE]> cannot write value to buffer from past\")\n212\t\t}\n213\t\n214\t\t// idx := int((ts - b.start + (b.frequency / 3)) / b.frequency)\n215\t\tidx := int((ts - b.start) / b.frequency)\n216\t\tif idx >= cap(b.data) {\n217\t\t\tnewbuf := newBuffer(ts, b.frequency)\n218\t\t\tnewbuf.prev = b\n219\t\t\tb.next = newbuf\n220\t\t\tb = newbuf\n221\t\t\tidx = 0\n222\t\t}\n223\t\n224\t\t// Overwriting value or writing value from past\n225\t\tif idx < len(b.data) {\n226\t\t\tb.data[idx] = value\n227\t\t\treturn b, nil\n228\t\t}\n229\t\n230\t\t// Fill up unwritten slots with NaN\n231\t\tfor i := len(b.data); i < idx; i++ {\n232\t\t\tb.data = append(b.data, schema.NaN)\n233\t\t}\n234\t\n235\t\tb.data = append(b.data, value)\n236\t\treturn b, nil\n237\t}\n238\t\n239\tfunc (b *buffer) end() int64 {\n240\t\treturn b.firstWrite() + int64(len(b.data))*b.frequency\n241\t}\n242\t\n243\tfunc (b *buffer) firstWrite() int64 {\n244\t\treturn b.start + (b.frequency / 2)\n245\t}\n246\t\n247\t// read retrieves time-series data from the buffer chain for the specified time range.\n248\t//\n249\t// Traverses the buffer chain backwards (via prev links) if 'from' precedes the current\n250\t// buffer's start. Missing data points are represented as NaN. Values are accumulated\n251\t// into the provided 'data' slice (using +=, so caller must zero-initialize if needed).\n252\t//\n253\t// The function adjusts the actual time range returned if data is unavailable at the\n254\t// boundaries (returned via adjusted from/to timestamps).\n255\t//\n256\t// Parameters:\n257\t//   - from: Start timestamp (Unix seconds)\n258\t//   - to:   End timestamp (Unix seconds, exclusive)\n259\t//   - data: Pre-allocated slice to accumulate results (must be large enough)\n260\t//\n261\t// Returns:\n262\t//   - []schema.Float: Slice of data (may be shorter than input 'data' slice)\n263\t//   - int64:          Actual start timestamp with available data\n264\t//   - int64:          Actual end timestamp (exclusive)\n265\t//   - error:          Non-nil on failure\n266\t//\n267\t// Panics if 'data' slice is too small to hold all values in [from, to).\n268\tfunc (b *buffer) read(from, to int64, data []schema.Float) ([]schema.Float, int64, int64, error) {\n269\t\t// Walk back to the buffer that covers 'from', adjusting if we hit the oldest.\n270\t\tfor from < b.firstWrite() {\n271\t\t\tif b.prev == nil {\n272\t\t\t\tfrom = b.firstWrite()\n273\t\t\t\tbreak\n274\t\t\t}\n275\t\t\tb = b.prev\n276\t\t}\n277\t\n278\t\ti := 0\n279\t\tt := from"}]},"uuid":"e08da265-1b52-4f7a-86ba-ff33a8cae3b9","timestamp":"2026-06-05T06:33:57.935Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/buffer.go","content":"//   - prev:      Link to older buffer in the chain (nil if this is oldest)\n//   - next:      Link to newer buffer in the chain (nil if this is newest/head)\n//   - data:      Time-series values (schema.Float supports NaN for missing data)\n//   - frequency: Measurement interval in seconds\n//   - start:     Start timestamp (adjusted by -frequency/2 for alignment)\n//   - archived:  True if data has been persisted to disk archive\n//   - closed:    True if buffer is no longer accepting writes\n//\n// Index calculation: index = (timestamp - start) / frequency\n// Actual data timestamp: start + (frequency / 2) + (index * frequency)\ntype buffer struct {\n\tprev      *buffer\n\tnext      *buffer\n\tdata      []schema.Float\n\tfrequency int64\n\tstart     int64\n\tarchived  bool\n\tclosed    bool\n\tlastUsed  int64\n}\n\nfunc newBuffer(ts, freq int64) *buffer {\n\tb := bufferPool.Get()\n\tb.frequency = freq\n\tb.start = ts - (freq / 2)\n\tb.prev = nil\n\tb.next = nil\n\tb.archived = false\n\tb.closed = false\n\tb.data = b.data[:0]\n\treturn b\n}\n\n// write appends a timestamped value to the buffer chain.\n//\n// Returns the head buffer (which may be newly created if capacity was reached).\n// Timestamps older than the buffer's start are rejected. If the calculated index\n// exceeds capacity, a new buffer is allocated and linked as the new head.\n//\n// Missing timestamps are automatically filled with NaN values to maintain alignment.\n// Overwrites are allowed if the index is already within the existing data slice.\n//\n// Parameters:\n//   - ts:    Unix timestamp in seconds\n//   - value: Metric value (can be schema.NaN for missing data)\n//\n// Returns:\n//   - *buffer: The new head buffer (same as b if no new buffer created)\n//   - error:   Non-nil if timestamp is before buffer start\nfunc (b *buffer) write(ts int64, value schema.Float) (*buffer, error) {\n\tif ts < b.start {\n\t\treturn nil, errors.New(\"[METRICSTORE]> cannot write value to buffer from past\")\n\t}\n\n\t// idx := int((ts - b.start + (b.frequency / 3)) / b.frequency)\n\tidx := int((ts - b.start) / b.frequency)\n\tif idx >= cap(b.data) {\n\t\tnewbuf := newBuffer(ts, b.frequency)\n\t\tnewbuf.prev = b\n\t\tb.next = newbuf\n\t\tb = newbuf\n\t\tidx = 0\n\t}\n\n\t// Overwriting value or writing value from past\n\tif idx < len(b.data) {\n\t\tb.data[idx] = value\n\t\treturn b, nil\n\t}\n\n\t// Fill up unwritten slots with NaN\n\tfor i := len(b.data); i < idx; i++ {\n\t\tb.data = append(b.data, schema.NaN)\n\t}\n\n\tb.data = append(b.data, value)\n\treturn b, nil\n}\n\nfunc (b *buffer) end() int64 {\n\treturn b.firstWrite() + int64(len(b.data))*b.frequency\n}\n\nfunc (b *buffer) firstWrite() int64 {\n\treturn b.start + (b.frequency / 2)\n}\n\n// read retrieves time-series data from the buffer chain for the specified time range.\n//\n// Traverses the buffer chain backwards (via prev links) if 'from' precedes the current\n// buffer's start. Missing data points are represented as NaN. Values are accumulated\n// into the provided 'data' slice (using +=, so caller must zero-initialize if needed).\n//\n// The function adjusts the actual time range returned if data is unavailable at the\n// boundaries (returned via adjusted from/to timestamps).\n//\n// Parameters:\n//   - from: Start timestamp (Unix seconds)\n//   - to:   End timestamp (Unix seconds, exclusive)\n//   - data: Pre-allocated slice to accumulate results (must be large enough)\n//\n// Returns:\n//   - []schema.Float: Slice of data (may be shorter than input 'data' slice)\n//   - int64:          Actual start timestamp with available data\n//   - int64:          Actual end timestamp (exclusive)\n//   - error:          Non-nil on failure\n//\n// Panics if 'data' slice is too small to hold all values in [from, to).\nfunc (b *buffer) read(from, to int64, data []schema.Float) ([]schema.Float, int64, int64, error) {\n\t// Walk back to the buffer that covers 'from', adjusting if we hit the oldest.\n\tfor from < b.firstWrite() {\n\t\tif b.prev == nil {\n\t\t\tfrom = b.firstWrite()\n\t\t\tbreak\n\t\t}\n\t\tb = b.prev\n\t}\n\n\ti := 0\n\tt := from","numLines":120,"startLine":160,"totalLines":422}},"sourceToolAssistantUUID":"c11484a5-2041-4db4-b3d7-7d54d16d6269","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
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+{"parentUuid":"5ffcdb61-e574-4914-920b-480765a8d7ea","isSidechain":false,"promptId":"bf1a2a8c-5f1a-4688-91c9-f9d2413ee03d","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01Amumq2VB1wnguBLQwVm5Cx","type":"tool_result","content":"641dc0e3 Run gofumpt\n66707bbf Update metricstore documentation\nfc47b12f fix: Pause WAL writes during binary checkpoint to prevent message drops\n937984d1 fix: WAL rotation skipped for all nodes due to non-blocking send on small channel\ncc3d03bb fix: Unbound growth of wal files in case of checkpointing error\nac0a4cc3 Increase shutdown timeouts and WAL flush interval\n97d65a9e Fix bugs in WAL journal pipeline\ne7598100 Add shutdown timings. Do not drain WAL buffers on shutdown\n6f7dda53 Cleanup\n0325d9e8 fix: Increase throughput for WAL writers\nbf1a8a17 fix: Shard WAL consumer for higher throughput\n50aed595 fix: metricstore NATS contention\n39ab1278 Make checkpointInterval an option config option again.\nb214e175 Add buffered I/O to WAL writes and fix MemoryCap comment\n39635ea1 Cleanup metricstore options\n=== lineprotocol WAL send ===\n18://     goroutine via the WALMessages channel for durable write-ahead logging.\n128:// walDropped counts WAL messages dropped due to a full channel.\n130:var walDropped atomic.Int64\n141:\t// selector is the sub-device path passed to WriteToLevel and WALMessage\n198:// sent to WALMessages so the WAL staging goroutine can persist it durably\n377:\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n378:\t\t\tmsg := &WALMessage{\n386:\t\t\tif !SendWALMessage(msg) {\n389:\t\t\t\tif dropped := walDropped.Add(1); dropped%10000 == 1 {","is_error":false}]},"uuid":"b7a05831-5352-46bb-aec5-e08f8bdeef56","timestamp":"2026-06-05T06:35:03.771Z","toolUseResult":{"stdout":"641dc0e3 Run gofumpt\n66707bbf Update metricstore documentation\nfc47b12f fix: Pause WAL writes during binary checkpoint to prevent message drops\n937984d1 fix: WAL rotation skipped for all nodes due to non-blocking send on small channel\ncc3d03bb fix: Unbound growth of wal files in case of checkpointing error\nac0a4cc3 Increase shutdown timeouts and WAL flush interval\n97d65a9e Fix bugs in WAL journal pipeline\ne7598100 Add shutdown timings. Do not drain WAL buffers on shutdown\n6f7dda53 Cleanup\n0325d9e8 fix: Increase throughput for WAL writers\nbf1a8a17 fix: Shard WAL consumer for higher throughput\n50aed595 fix: metricstore NATS contention\n39ab1278 Make checkpointInterval an option config option again.\nb214e175 Add buffered I/O to WAL writes and fix MemoryCap comment\n39635ea1 Cleanup metricstore options\n=== lineprotocol WAL send ===\n18://     goroutine via the WALMessages channel for durable write-ahead logging.\n128:// walDropped counts WAL messages dropped due to a full channel.\n130:var walDropped atomic.Int64\n141:\t// selector is the sub-device path passed to WriteToLevel and WALMessage\n198:// sent to WALMessages so the WAL staging goroutine can persist it durably\n377:\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n378:\t\t\tmsg := &WALMessage{\n386:\t\t\tif !SendWALMessage(msg) {\n389:\t\t\t\tif dropped := walDropped.Add(1); dropped%10000 == 1 {","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"5ffcdb61-e574-4914-920b-480765a8d7ea","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
+{"type":"last-prompt","lastPrompt":"This application uses a files based checkpointing mechanism using a WAL algorithm for crash recovery. Analyse when the wal files are reset. Currently the wal files are not reset and continously grow a…","leafUuid":"b7a05831-5352-46bb-aec5-e08f8bdeef56","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63"}
+{"type":"ai-title","aiTitle":"Analyze WAL file reset mechanism in checkpoint system","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63"}
+{"type":"mode","mode":"normal","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63"}
+{"type":"permission-mode","permissionMode":"plan","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63"}
+{"parentUuid":"b7a05831-5352-46bb-aec5-e08f8bdeef56","isSidechain":false,"message":{"model":"claude-opus-4-8","id":"msg_01FtP8QD13m58ayRkxvYMUSt","type":"message","role":"assistant","content":[{"type":"thinking","thinking":"","signature":"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"}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":5701,"cache_read_input_tokens":74976,"output_tokens":237,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":5701,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":2,"output_tokens":237,"cache_read_input_tokens":74976,"cache_creation_input_tokens":5701,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":5701},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011CbjeZQ1hmfZuZK4DNims9","type":"assistant","uuid":"0bad265b-554e-452b-b636-72869d56cea9","timestamp":"2026-06-05T06:35:07.431Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
+{"parentUuid":"0bad265b-554e-452b-b636-72869d56cea9","isSidechain":false,"message":{"model":"claude-opus-4-8","id":"msg_01FtP8QD13m58ayRkxvYMUSt","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01EP3rQPQwZSfieLcCETpWoU","name":"Bash","input":{"command":"git show cc3d03bb --stat; echo \"==========\"; git show cc3d03bb -- pkg/metricstore/checkpoint.go | head -120"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":5701,"cache_read_input_tokens":74976,"output_tokens":237,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":5701,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":2,"output_tokens":237,"cache_read_input_tokens":74976,"cache_creation_input_tokens":5701,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":5701},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011CbjeZQ1hmfZuZK4DNims9","type":"assistant","uuid":"820b3ea9-abca-48d5-8a6a-b4f018157c6f","timestamp":"2026-06-05T06:35:07.675Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
+{"parentUuid":"820b3ea9-abca-48d5-8a6a-b4f018157c6f","isSidechain":false,"promptId":"bf1a2a8c-5f1a-4688-91c9-f9d2413ee03d","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01EP3rQPQwZSfieLcCETpWoU","type":"tool_result","content":"commit cc3d03bb5b78c26b3dd2e04279b6206ed3753034\nAuthor: Jan Eitzinger <jan@moebiusband.org>\nDate:   Sat Mar 28 06:26:21 2026 +0100\n\n    fix: Unbound growth of wal files in case of checkpointing error\n    \n    Entire-Checkpoint: 95a89a7127c5\n\n ReleaseNotes.md                  | 10 ++++++++++\n pkg/metricstore/checkpoint.go    |  3 ++-\n pkg/metricstore/config.go        |  7 +++++--\n pkg/metricstore/configSchema.go  |  5 +++++\n pkg/metricstore/walCheckpoint.go | 40 ++++++++++++++++++++++++++++++++++------\n 5 files changed, 56 insertions(+), 9 deletions(-)\n==========\ncommit cc3d03bb5b78c26b3dd2e04279b6206ed3753034\nAuthor: Jan Eitzinger <jan@moebiusband.org>\nDate:   Sat Mar 28 06:26:21 2026 +0100\n\n    fix: Unbound growth of wal files in case of checkpointing error\n    \n    Entire-Checkpoint: 95a89a7127c5\n\ndiff --git a/pkg/metricstore/checkpoint.go b/pkg/metricstore/checkpoint.go\nindex 3627a67b..2dcb5733 100644\n--- a/pkg/metricstore/checkpoint.go\n+++ b/pkg/metricstore/checkpoint.go\n@@ -129,7 +129,8 @@ func Checkpointing(wg *sync.WaitGroup, ctx context.Context) {\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}\n+\t\t\t\t\tif n > 0 {\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","is_error":false}]},"uuid":"8deb0934-6744-4e83-9418-c683fbc0c9a9","timestamp":"2026-06-05T06:35:07.753Z","toolUseResult":{"stdout":"commit cc3d03bb5b78c26b3dd2e04279b6206ed3753034\nAuthor: Jan Eitzinger <jan@moebiusband.org>\nDate:   Sat Mar 28 06:26:21 2026 +0100\n\n    fix: Unbound growth of wal files in case of checkpointing error\n    \n    Entire-Checkpoint: 95a89a7127c5\n\n ReleaseNotes.md                  | 10 ++++++++++\n pkg/metricstore/checkpoint.go    |  3 ++-\n pkg/metricstore/config.go        |  7 +++++--\n pkg/metricstore/configSchema.go  |  5 +++++\n pkg/metricstore/walCheckpoint.go | 40 ++++++++++++++++++++++++++++++++++------\n 5 files changed, 56 insertions(+), 9 deletions(-)\n==========\ncommit cc3d03bb5b78c26b3dd2e04279b6206ed3753034\nAuthor: Jan Eitzinger <jan@moebiusband.org>\nDate:   Sat Mar 28 06:26:21 2026 +0100\n\n    fix: Unbound growth of wal files in case of checkpointing error\n    \n    Entire-Checkpoint: 95a89a7127c5\n\ndiff --git a/pkg/metricstore/checkpoint.go b/pkg/metricstore/checkpoint.go\nindex 3627a67b..2dcb5733 100644\n--- a/pkg/metricstore/checkpoint.go\n+++ b/pkg/metricstore/checkpoint.go\n@@ -129,7 +129,8 @@ func Checkpointing(wg *sync.WaitGroup, ctx context.Context) {\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}\n+\t\t\t\t\tif n > 0 {\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","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"820b3ea9-abca-48d5-8a6a-b4f018157c6f","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
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+{"parentUuid":"1aa69c8f-59da-47c9-9ea8-110e6762e297","isSidechain":false,"message":{"model":"claude-opus-4-8","id":"msg_01GwQamZYtooY6qcLNYgrsnv","type":"message","role":"assistant","content":[{"type":"text","text":"I now have a definitive root cause. Let me write the plan.\n\nThe mechanism is clear:\n- **Periodic checkpoint** (`Checkpointing`, default every 12h): writes `.bin` snapshots, then calls `RotateWALFiles(successDirs)` → WAL reset works here.\n- **Force-rotate** when `ws.size >= MaxWALSize` — but `MaxWALSize` defaults to `0` (unlimited), so never fires by default.\n- **Shutdown** (`Shutdown()`): writes a final `.bin` snapshot via `ToCheckpointWAL`, but **discards the `successDirs` return (`_`) and never rotates the WAL**. The comment \"WAL files are deleted per-host inside ToCheckpointWAL workers\" is false — `ToCheckpointWAL`/`toCheckpointBinary` only write snapshots. The purpose-built helper `RotateWALFilesAfterShutdown` exists but is **never called anywhere**.\n\nSo after every clean shutdown the `current.wal` files survive, the next startup replays them *and keeps appending to the same files*, and they are never reset until a (12h-default) periodic checkpoint happens to run. That is exactly \"not reset and continuously grow after a start.\""}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":3002,"cache_read_input_tokens":81688,"output_tokens":5079,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":3002,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":2,"output_tokens":5079,"cache_read_input_tokens":81688,"cache_creation_input_tokens":3002,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":3002},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011Cbjec2pKcocXt8DnSE7Fn","type":"assistant","uuid":"21ea6897-90f1-4b25-a66a-a603eca70cfa","timestamp":"2026-06-05T06:36:14.114Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
+{"parentUuid":"21ea6897-90f1-4b25-a66a-a603eca70cfa","isSidechain":false,"message":{"model":"claude-opus-4-8","id":"msg_01GwQamZYtooY6qcLNYgrsnv","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_0121KshqpKzxw3EFCpCNAcii","name":"Write","input":{"file_path":"/Users/jan/.claude/plans/this-application-uses-a-shiny-flame.md","content":"# Fix: WAL files are never reset on shutdown (continuous growth across restarts)\n\n## Context\n\nThe metric store (`pkg/metricstore`) uses a WAL + periodic binary-snapshot\ncheckpoint scheme for crash recovery. Each host has an append-only\n`checkpoints/<cluster>/<host>/current.wal` that records every metric write, plus\nperiodic `<ts>.bin` full-tree snapshots. On startup the newest `.bin` is loaded\nand `current.wal` is replayed on top.\n\nA `current.wal` is only meant to hold writes *since the last snapshot*. Once a\nsnapshot is written, the WAL is redundant and must be rotated (deleted). The user\nreports that WAL files are never reset and grow without bound after a start.\n\n## Root cause\n\nWAL rotation happens in exactly these places today:\n\n1. **Periodic checkpoint** — `Checkpointing()` in `pkg/metricstore/checkpoint.go:128-145`\n   writes snapshots via `ToCheckpointWAL`, then calls `RotateWALFiles(hostDirs)`\n   for the hosts that got a fresh snapshot. This path works, but the default\n   `checkpoint-interval` is **12h**, so the WAL grows for up to 12h between resets.\n2. **Force-rotate on size** — in `WALStaging`/`processMsg`\n   (`pkg/metricstore/walCheckpoint.go:255`) when `ws.size >= MaxWALSize`. But\n   `MaxWALSize` (`config.go:69`) defaults to `0` = unlimited, so this never fires\n   unless explicitly configured.\n3. **Shutdown** — `Shutdown()` in `pkg/metricstore/metricstore.go:310-315`.\n\nThe **shutdown path is broken**. It writes a final snapshot but never rotates the\nWAL:\n\n```go\nif Keys.Checkpoints.FileFormat == \"wal\" {\n    // WAL files are deleted per-host inside ToCheckpointWAL workers.   <-- FALSE\n    files, _, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n}\n```\n\n- The comment is incorrect: `ToCheckpointWAL` / `toCheckpointBinary`\n  (`walCheckpoint.go:667`, `:768`) only write `.bin` snapshots; they do **not**\n  touch `current.wal`.\n- The second return value (`successDirs` — hosts that got a fresh snapshot) is\n  discarded with `_`.\n- The purpose-built helper `RotateWALFilesAfterShutdown(hostDirs)`\n  (`walCheckpoint.go:406`), which directly `os.Remove`s `current.wal` files after\n  the staging goroutines have exited, is **defined but never called** (verified by\n  grep across `cmd/`, `internal/`, `pkg/`).\n\nConsequence: after each clean shutdown the `current.wal` files remain on disk. On\nthe next startup they are replayed (redundantly, since the `.bin` already has that\ndata) and then **appended to again** (the staging goroutine opens the existing\nfile with `O_APPEND`). Across restarts the WAL grows monotonically and is only\never reset if a 12h periodic checkpoint happens to run. This is the reported\n\"not reset / continuously grows after a start\" behavior.\n\nNote on ordering: in `Shutdown()` the WAL staging goroutines are already stopped\n(channels closed + `WaitForWALStagingDrain()`) *before* the final\n`ToCheckpointWAL`. So the channel-based `RotateWALFiles` is unsafe here — that is\nexactly why the direct-removal `RotateWALFilesAfterShutdown` variant exists.\n\n## Fix\n\nIn `pkg/metricstore/metricstore.go`, `Shutdown()` (the `FileFormat == \"wal\"`\nbranch, ~line 310): capture the `successDirs` return from `ToCheckpointWAL` and\nrotate those WAL files after the snapshot is durably written.\n\n```go\nif Keys.Checkpoints.FileFormat == \"wal\" {\n    var successDirs []string\n    files, successDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n    // Staging goroutines have already exited, so remove the now-redundant\n    // current.wal files directly (channel-based RotateWALFiles is unsafe here).\n    RotateWALFilesAfterShutdown(successDirs)\n} else {\n    files, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n}\n```\n\nRotate **only `successDirs`** (hosts that received a fresh snapshot), mirroring the\nperiodic path. A host that produced no snapshot (`ErrNoNewArchiveData`) had no new\nunarchived data for the window, so its WAL is left untouched to avoid dropping any\nrecord not yet captured by a snapshot. Remove/replace the misleading comment.\n\n### Files\n- `pkg/metricstore/metricstore.go` — `Shutdown()` WAL branch (only change needed).\n\n### Reused existing code\n- `RotateWALFilesAfterShutdown([]string)` — `pkg/metricstore/walCheckpoint.go:406`\n  (already implemented; just needs to be wired in).\n- `successDirs` return of `ToCheckpointWAL` — `walCheckpoint.go:667`.\n\n## Verification\n\n1. Build: `go build ./...`\n2. Targeted unit test (add to `pkg/metricstore`): write a few metrics so a host\n   WAL exists, run a checkpoint + `Shutdown()` equivalent, then assert\n   `current.wal` no longer exists (or is recreated empty) for hosts that were\n   snapshotted. Run `go test ./pkg/metricstore/...`.\n3. Manual end-to-end:\n   - Configure `checkpoints.file-format: \"wal\"` (default) with a short\n     `checkpoint-interval` is *not* required for this test.\n   - Start `cc-backend`, ingest some metrics, confirm\n     `var/checkpoints/<cluster>/<host>/current.wal` grows.\n   - Stop the server (graceful shutdown) and confirm a new `<ts>.bin` appears and\n     `current.wal` is gone for active hosts.\n   - Restart, ingest more, stop again — confirm the WAL does not accumulate the\n     previous run's bytes (size resets each clean shutdown rather than growing\n     monotonically).\n\n## Out of scope / follow-ups (mention only)\n- The 12h default `checkpoint-interval` still bounds in-run WAL growth; operators\n  who want tighter bounds can lower it or set `checkpoints.max-wal-size`. No code\n  change proposed here unless requested.\n"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":3002,"cache_read_input_tokens":81688,"output_tokens":5079,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":3002,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":2,"output_tokens":5079,"cache_read_input_tokens":81688,"cache_creation_input_tokens":3002,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":3002},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011Cbjec2pKcocXt8DnSE7Fn","type":"assistant","uuid":"c89103d9-2fb1-4b3a-ba7a-d6bf35deba3a","timestamp":"2026-06-05T06:36:40.776Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
+{"parentUuid":"c89103d9-2fb1-4b3a-ba7a-d6bf35deba3a","isSidechain":false,"promptId":"bf1a2a8c-5f1a-4688-91c9-f9d2413ee03d","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_0121KshqpKzxw3EFCpCNAcii","type":"tool_result","content":"File created successfully at: /Users/jan/.claude/plans/this-application-uses-a-shiny-flame.md (file state is current in your context — no need to Read it back)"}]},"uuid":"a228e29f-73f4-4773-a405-0100a492cb18","timestamp":"2026-06-05T06:36:40.803Z","toolUseResult":{"type":"create","filePath":"/Users/jan/.claude/plans/this-application-uses-a-shiny-flame.md","content":"# Fix: WAL files are never reset on shutdown (continuous growth across restarts)\n\n## Context\n\nThe metric store (`pkg/metricstore`) uses a WAL + periodic binary-snapshot\ncheckpoint scheme for crash recovery. Each host has an append-only\n`checkpoints/<cluster>/<host>/current.wal` that records every metric write, plus\nperiodic `<ts>.bin` full-tree snapshots. On startup the newest `.bin` is loaded\nand `current.wal` is replayed on top.\n\nA `current.wal` is only meant to hold writes *since the last snapshot*. Once a\nsnapshot is written, the WAL is redundant and must be rotated (deleted). The user\nreports that WAL files are never reset and grow without bound after a start.\n\n## Root cause\n\nWAL rotation happens in exactly these places today:\n\n1. **Periodic checkpoint** — `Checkpointing()` in `pkg/metricstore/checkpoint.go:128-145`\n   writes snapshots via `ToCheckpointWAL`, then calls `RotateWALFiles(hostDirs)`\n   for the hosts that got a fresh snapshot. This path works, but the default\n   `checkpoint-interval` is **12h**, so the WAL grows for up to 12h between resets.\n2. **Force-rotate on size** — in `WALStaging`/`processMsg`\n   (`pkg/metricstore/walCheckpoint.go:255`) when `ws.size >= MaxWALSize`. But\n   `MaxWALSize` (`config.go:69`) defaults to `0` = unlimited, so this never fires\n   unless explicitly configured.\n3. **Shutdown** — `Shutdown()` in `pkg/metricstore/metricstore.go:310-315`.\n\nThe **shutdown path is broken**. It writes a final snapshot but never rotates the\nWAL:\n\n```go\nif Keys.Checkpoints.FileFormat == \"wal\" {\n    // WAL files are deleted per-host inside ToCheckpointWAL workers.   <-- FALSE\n    files, _, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n}\n```\n\n- The comment is incorrect: `ToCheckpointWAL` / `toCheckpointBinary`\n  (`walCheckpoint.go:667`, `:768`) only write `.bin` snapshots; they do **not**\n  touch `current.wal`.\n- The second return value (`successDirs` — hosts that got a fresh snapshot) is\n  discarded with `_`.\n- The purpose-built helper `RotateWALFilesAfterShutdown(hostDirs)`\n  (`walCheckpoint.go:406`), which directly `os.Remove`s `current.wal` files after\n  the staging goroutines have exited, is **defined but never called** (verified by\n  grep across `cmd/`, `internal/`, `pkg/`).\n\nConsequence: after each clean shutdown the `current.wal` files remain on disk. On\nthe next startup they are replayed (redundantly, since the `.bin` already has that\ndata) and then **appended to again** (the staging goroutine opens the existing\nfile with `O_APPEND`). Across restarts the WAL grows monotonically and is only\never reset if a 12h periodic checkpoint happens to run. This is the reported\n\"not reset / continuously grows after a start\" behavior.\n\nNote on ordering: in `Shutdown()` the WAL staging goroutines are already stopped\n(channels closed + `WaitForWALStagingDrain()`) *before* the final\n`ToCheckpointWAL`. So the channel-based `RotateWALFiles` is unsafe here — that is\nexactly why the direct-removal `RotateWALFilesAfterShutdown` variant exists.\n\n## Fix\n\nIn `pkg/metricstore/metricstore.go`, `Shutdown()` (the `FileFormat == \"wal\"`\nbranch, ~line 310): capture the `successDirs` return from `ToCheckpointWAL` and\nrotate those WAL files after the snapshot is durably written.\n\n```go\nif Keys.Checkpoints.FileFormat == \"wal\" {\n    var successDirs []string\n    files, successDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n    // Staging goroutines have already exited, so remove the now-redundant\n    // current.wal files directly (channel-based RotateWALFiles is unsafe here).\n    RotateWALFilesAfterShutdown(successDirs)\n} else {\n    files, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n}\n```\n\nRotate **only `successDirs`** (hosts that received a fresh snapshot), mirroring the\nperiodic path. A host that produced no snapshot (`ErrNoNewArchiveData`) had no new\nunarchived data for the window, so its WAL is left untouched to avoid dropping any\nrecord not yet captured by a snapshot. Remove/replace the misleading comment.\n\n### Files\n- `pkg/metricstore/metricstore.go` — `Shutdown()` WAL branch (only change needed).\n\n### Reused existing code\n- `RotateWALFilesAfterShutdown([]string)` — `pkg/metricstore/walCheckpoint.go:406`\n  (already implemented; just needs to be wired in).\n- `successDirs` return of `ToCheckpointWAL` — `walCheckpoint.go:667`.\n\n## Verification\n\n1. Build: `go build ./...`\n2. Targeted unit test (add to `pkg/metricstore`): write a few metrics so a host\n   WAL exists, run a checkpoint + `Shutdown()` equivalent, then assert\n   `current.wal` no longer exists (or is recreated empty) for hosts that were\n   snapshotted. Run `go test ./pkg/metricstore/...`.\n3. Manual end-to-end:\n   - Configure `checkpoints.file-format: \"wal\"` (default) with a short\n     `checkpoint-interval` is *not* required for this test.\n   - Start `cc-backend`, ingest some metrics, confirm\n     `var/checkpoints/<cluster>/<host>/current.wal` grows.\n   - Stop the server (graceful shutdown) and confirm a new `<ts>.bin` appears and\n     `current.wal` is gone for active hosts.\n   - Restart, ingest more, stop again — confirm the WAL does not accumulate the\n     previous run's bytes (size resets each clean shutdown rather than growing\n     monotonically).\n\n## Out of scope / follow-ups (mention only)\n- The 12h default `checkpoint-interval` still bounds in-run WAL growth; operators\n  who want tighter bounds can lower it or set `checkpoints.max-wal-size`. No code\n  change proposed here unless requested.\n","structuredPatch":[],"originalFile":null,"userModified":false},"sourceToolAssistantUUID":"c89103d9-2fb1-4b3a-ba7a-d6bf35deba3a","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
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+{"parentUuid":"fe780238-3cdd-473f-a8b1-6c2c515aad4c","isSidechain":false,"message":{"model":"claude-opus-4-8","id":"msg_012nFx1mWrxdA1xKfBngTJXn","type":"message","role":"assistant","content":[{"type":"text","text":"## Analysis: when are WAL files reset\n\nWAL rotation (deletion of `current.wal`) happens in only three places:\n\n1. **Periodic checkpoint** — `Checkpointing()` (`checkpoint.go:128-145`) writes `.bin` snapshots, then `RotateWALFiles(successDirs)`. ✅ works, but default `checkpoint-interval` is **12h**.\n2. **Size cap** — force-rotate when `ws.size >= MaxWALSize` (`walCheckpoint.go:255`). But `max-wal-size` defaults to **0 = unlimited**, so it never fires by default.\n3. **Shutdown** — `Shutdown()` (`metricstore.go:310-315`). **Broken.**\n\nThe bug is in shutdown. It writes a final snapshot but never rotates:\n\n```go\n// WAL files are deleted per-host inside ToCheckpointWAL workers.   ← FALSE\nfiles, _, err = ms.ToCheckpointWAL(...)\n```\n\n`ToCheckpointWAL` only writes `.bin` files — it does not touch `current.wal`. The `successDirs` return is thrown away (`_`), and the dedicated helper `RotateWALFilesAfterShutdown()` (`walCheckpoint.go:406`) exists but is **never called anywhere** (confirmed by grep). So after each clean shutdown the `current.wal` files survive; the next startup replays them *and keeps appending to the same files* (opened `O_APPEND`). They only ever reset if a 12h periodic checkpoint happens to run — exactly the \"not reset / continuously grows after a start\" you observed.\n\nThe fix is small: in `Shutdown()`, capture `successDirs` and call `RotateWALFilesAfterShutdown(successDirs)` after the final snapshot (the staging goroutines are already stopped, which is why the direct-removal variant exists). Full details, verification steps, and reasoning are in the plan."}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":74884,"cache_read_input_tokens":16048,"output_tokens":705,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":74884,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":2,"output_tokens":705,"cache_read_input_tokens":16048,"cache_creation_input_tokens":74884,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":74884},"type":"message"}],"speed":"standard"},"diagnostics":{"cache_miss_reason":{"type":"tools_changed","cache_missed_input_tokens":74919}}},"requestId":"req_011Cbjeh4PiVV1WyvrR3yHHJ","type":"assistant","uuid":"571e7796-d9f6-43bf-9d47-ff6adfa3b7d0","timestamp":"2026-06-05T06:36:58.373Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
+{"parentUuid":"571e7796-d9f6-43bf-9d47-ff6adfa3b7d0","isSidechain":false,"message":{"model":"claude-opus-4-8","id":"msg_012nFx1mWrxdA1xKfBngTJXn","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01A3rwF58C6toTnjkQjAh9nX","name":"ExitPlanMode","input":{"plan":"# Fix: WAL files are never reset on shutdown (continuous growth across restarts)\n\n## Context\n\nThe metric store (`pkg/metricstore`) uses a WAL + periodic binary-snapshot\ncheckpoint scheme for crash recovery. Each host has an append-only\n`checkpoints/<cluster>/<host>/current.wal` that records every metric write, plus\nperiodic `<ts>.bin` full-tree snapshots. On startup the newest `.bin` is loaded\nand `current.wal` is replayed on top.\n\nA `current.wal` is only meant to hold writes *since the last snapshot*. Once a\nsnapshot is written, the WAL is redundant and must be rotated (deleted). The user\nreports that WAL files are never reset and grow without bound after a start.\n\n## Root cause\n\nWAL rotation happens in exactly these places today:\n\n1. **Periodic checkpoint** — `Checkpointing()` in `pkg/metricstore/checkpoint.go:128-145`\n   writes snapshots via `ToCheckpointWAL`, then calls `RotateWALFiles(hostDirs)`\n   for the hosts that got a fresh snapshot. This path works, but the default\n   `checkpoint-interval` is **12h**, so the WAL grows for up to 12h between resets.\n2. **Force-rotate on size** — in `WALStaging`/`processMsg`\n   (`pkg/metricstore/walCheckpoint.go:255`) when `ws.size >= MaxWALSize`. But\n   `MaxWALSize` (`config.go:69`) defaults to `0` = unlimited, so this never fires\n   unless explicitly configured.\n3. **Shutdown** — `Shutdown()` in `pkg/metricstore/metricstore.go:310-315`.\n\nThe **shutdown path is broken**. It writes a final snapshot but never rotates the\nWAL:\n\n```go\nif Keys.Checkpoints.FileFormat == \"wal\" {\n    // WAL files are deleted per-host inside ToCheckpointWAL workers.   <-- FALSE\n    files, _, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n}\n```\n\n- The comment is incorrect: `ToCheckpointWAL` / `toCheckpointBinary`\n  (`walCheckpoint.go:667`, `:768`) only write `.bin` snapshots; they do **not**\n  touch `current.wal`.\n- The second return value (`successDirs` — hosts that got a fresh snapshot) is\n  discarded with `_`.\n- The purpose-built helper `RotateWALFilesAfterShutdown(hostDirs)`\n  (`walCheckpoint.go:406`), which directly `os.Remove`s `current.wal` files after\n  the staging goroutines have exited, is **defined but never called** (verified by\n  grep across `cmd/`, `internal/`, `pkg/`).\n\nConsequence: after each clean shutdown the `current.wal` files remain on disk. On\nthe next startup they are replayed (redundantly, since the `.bin` already has that\ndata) and then **appended to again** (the staging goroutine opens the existing\nfile with `O_APPEND`). Across restarts the WAL grows monotonically and is only\never reset if a 12h periodic checkpoint happens to run. This is the reported\n\"not reset / continuously grows after a start\" behavior.\n\nNote on ordering: in `Shutdown()` the WAL staging goroutines are already stopped\n(channels closed + `WaitForWALStagingDrain()`) *before* the final\n`ToCheckpointWAL`. So the channel-based `RotateWALFiles` is unsafe here — that is\nexactly why the direct-removal `RotateWALFilesAfterShutdown` variant exists.\n\n## Fix\n\nIn `pkg/metricstore/metricstore.go`, `Shutdown()` (the `FileFormat == \"wal\"`\nbranch, ~line 310): capture the `successDirs` return from `ToCheckpointWAL` and\nrotate those WAL files after the snapshot is durably written.\n\n```go\nif Keys.Checkpoints.FileFormat == \"wal\" {\n    var successDirs []string\n    files, successDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n    // Staging goroutines have already exited, so remove the now-redundant\n    // current.wal files directly (channel-based RotateWALFiles is unsafe here).\n    RotateWALFilesAfterShutdown(successDirs)\n} else {\n    files, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n}\n```\n\nRotate **only `successDirs`** (hosts that received a fresh snapshot), mirroring the\nperiodic path. A host that produced no snapshot (`ErrNoNewArchiveData`) had no new\nunarchived data for the window, so its WAL is left untouched to avoid dropping any\nrecord not yet captured by a snapshot. Remove/replace the misleading comment.\n\n### Files\n- `pkg/metricstore/metricstore.go` — `Shutdown()` WAL branch (only change needed).\n\n### Reused existing code\n- `RotateWALFilesAfterShutdown([]string)` — `pkg/metricstore/walCheckpoint.go:406`\n  (already implemented; just needs to be wired in).\n- `successDirs` return of `ToCheckpointWAL` — `walCheckpoint.go:667`.\n\n## Verification\n\n1. Build: `go build ./...`\n2. Targeted unit test (add to `pkg/metricstore`): write a few metrics so a host\n   WAL exists, run a checkpoint + `Shutdown()` equivalent, then assert\n   `current.wal` no longer exists (or is recreated empty) for hosts that were\n   snapshotted. Run `go test ./pkg/metricstore/...`.\n3. Manual end-to-end:\n   - Configure `checkpoints.file-format: \"wal\"` (default) with a short\n     `checkpoint-interval` is *not* required for this test.\n   - Start `cc-backend`, ingest some metrics, confirm\n     `var/checkpoints/<cluster>/<host>/current.wal` grows.\n   - Stop the server (graceful shutdown) and confirm a new `<ts>.bin` appears and\n     `current.wal` is gone for active hosts.\n   - Restart, ingest more, stop again — confirm the WAL does not accumulate the\n     previous run's bytes (size resets each clean shutdown rather than growing\n     monotonically).\n\n## Out of scope / follow-ups (mention only)\n- The 12h default `checkpoint-interval` still bounds in-run WAL growth; operators\n  who want tighter bounds can lower it or set `checkpoints.max-wal-size`. No code\n  change proposed here unless requested.\n","planFilePath":"/Users/jan/.claude/plans/this-application-uses-a-shiny-flame.md"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":2,"cache_creation_input_tokens":74884,"cache_read_input_tokens":16048,"output_tokens":705,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":74884,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":2,"output_tokens":705,"cache_read_input_tokens":16048,"cache_creation_input_tokens":74884,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":74884},"type":"message"}],"speed":"standard"},"diagnostics":{"cache_miss_reason":{"type":"tools_changed","cache_missed_input_tokens":74919}}},"requestId":"req_011Cbjeh4PiVV1WyvrR3yHHJ","type":"assistant","uuid":"9643ca2e-b89a-4220-a42a-fac51f89f8c4","timestamp":"2026-06-05T06:36:58.424Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
+{"parentUuid":"9643ca2e-b89a-4220-a42a-fac51f89f8c4","isSidechain":false,"promptId":"bf1a2a8c-5f1a-4688-91c9-f9d2413ee03d","type":"user","message":{"role":"user","content":[{"type":"tool_result","content":"User has approved your plan. You can now start coding. Start with updating your todo list if applicable\n\nYour plan has been saved to: /Users/jan/.claude/plans/this-application-uses-a-shiny-flame.md\nYou can refer back to it if needed during implementation.\n\n## Approved Plan:\n# Fix: WAL files are never reset on shutdown (continuous growth across restarts)\n\n## Context\n\nThe metric store (`pkg/metricstore`) uses a WAL + periodic binary-snapshot\ncheckpoint scheme for crash recovery. Each host has an append-only\n`checkpoints/<cluster>/<host>/current.wal` that records every metric write, plus\nperiodic `<ts>.bin` full-tree snapshots. On startup the newest `.bin` is loaded\nand `current.wal` is replayed on top.\n\nA `current.wal` is only meant to hold writes *since the last snapshot*. Once a\nsnapshot is written, the WAL is redundant and must be rotated (deleted). The user\nreports that WAL files are never reset and grow without bound after a start.\n\n## Root cause\n\nWAL rotation happens in exactly these places today:\n\n1. **Periodic checkpoint** — `Checkpointing()` in `pkg/metricstore/checkpoint.go:128-145`\n   writes snapshots via `ToCheckpointWAL`, then calls `RotateWALFiles(hostDirs)`\n   for the hosts that got a fresh snapshot. This path works, but the default\n   `checkpoint-interval` is **12h**, so the WAL grows for up to 12h between resets.\n2. **Force-rotate on size** — in `WALStaging`/`processMsg`\n   (`pkg/metricstore/walCheckpoint.go:255`) when `ws.size >= MaxWALSize`. But\n   `MaxWALSize` (`config.go:69`) defaults to `0` = unlimited, so this never fires\n   unless explicitly configured.\n3. **Shutdown** — `Shutdown()` in `pkg/metricstore/metricstore.go:310-315`.\n\nThe **shutdown path is broken**. It writes a final snapshot but never rotates the\nWAL:\n\n```go\nif Keys.Checkpoints.FileFormat == \"wal\" {\n    // WAL files are deleted per-host inside ToCheckpointWAL workers.   <-- FALSE\n    files, _, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n}\n```\n\n- The comment is incorrect: `ToCheckpointWAL` / `toCheckpointBinary`\n  (`walCheckpoint.go:667`, `:768`) only write `.bin` snapshots; they do **not**\n  touch `current.wal`.\n- The second return value (`successDirs` — hosts that got a fresh snapshot) is\n  discarded with `_`.\n- The purpose-built helper `RotateWALFilesAfterShutdown(hostDirs)`\n  (`walCheckpoint.go:406`), which directly `os.Remove`s `current.wal` files after\n  the staging goroutines have exited, is **defined but never called** (verified by\n  grep across `cmd/`, `internal/`, `pkg/`).\n\nConsequence: after each clean shutdown the `current.wal` files remain on disk. On\nthe next startup they are replayed (redundantly, since the `.bin` already has that\ndata) and then **appended to again** (the staging goroutine opens the existing\nfile with `O_APPEND`). Across restarts the WAL grows monotonically and is only\never reset if a 12h periodic checkpoint happens to run. This is the reported\n\"not reset / continuously grows after a start\" behavior.\n\nNote on ordering: in `Shutdown()` the WAL staging goroutines are already stopped\n(channels closed + `WaitForWALStagingDrain()`) *before* the final\n`ToCheckpointWAL`. So the channel-based `RotateWALFiles` is unsafe here — that is\nexactly why the direct-removal `RotateWALFilesAfterShutdown` variant exists.\n\n## Fix\n\nIn `pkg/metricstore/metricstore.go`, `Shutdown()` (the `FileFormat == \"wal\"`\nbranch, ~line 310): capture the `successDirs` return from `ToCheckpointWAL` and\nrotate those WAL files after the snapshot is durably written.\n\n```go\nif Keys.Checkpoints.FileFormat == \"wal\" {\n    var successDirs []string\n    files, successDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n    // Staging goroutines have already exited, so remove the now-redundant\n    // current.wal files directly (channel-based RotateWALFiles is unsafe here).\n    RotateWALFilesAfterShutdown(successDirs)\n} else {\n    files, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n}\n```\n\nRotate **only `successDirs`** (hosts that received a fresh snapshot), mirroring the\nperiodic path. A host that produced no snapshot (`ErrNoNewArchiveData`) had no new\nunarchived data for the window, so its WAL is left untouched to avoid dropping any\nrecord not yet captured by a snapshot. Remove/replace the misleading comment.\n\n### Files\n- `pkg/metricstore/metricstore.go` — `Shutdown()` WAL branch (only change needed).\n\n### Reused existing code\n- `RotateWALFilesAfterShutdown([]string)` — `pkg/metricstore/walCheckpoint.go:406`\n  (already implemented; just needs to be wired in).\n- `successDirs` return of `ToCheckpointWAL` — `walCheckpoint.go:667`.\n\n## Verification\n\n1. Build: `go build ./...`\n2. Targeted unit test (add to `pkg/metricstore`): write a few metrics so a host\n   WAL exists, run a checkpoint + `Shutdown()` equivalent, then assert\n   `current.wal` no longer exists (or is recreated empty) for hosts that were\n   snapshotted. Run `go test ./pkg/metricstore/...`.\n3. Manual end-to-end:\n   - Configure `checkpoints.file-format: \"wal\"` (default) with a short\n     `checkpoint-interval` is *not* required for this test.\n   - Start `cc-backend`, ingest some metrics, confirm\n     `var/checkpoints/<cluster>/<host>/current.wal` grows.\n   - Stop the server (graceful shutdown) and confirm a new `<ts>.bin` appears and\n     `current.wal` is gone for active hosts.\n   - Restart, ingest more, stop again — confirm the WAL does not accumulate the\n     previous run's bytes (size resets each clean shutdown rather than growing\n     monotonically).\n\n## Out of scope / follow-ups (mention only)\n- The 12h default `checkpoint-interval` still bounds in-run WAL growth; operators\n  who want tighter bounds can lower it or set `checkpoints.max-wal-size`. No code\n  change proposed here unless requested.\n","tool_use_id":"toolu_01A3rwF58C6toTnjkQjAh9nX"}]},"uuid":"708b268f-f868-4386-a4de-dcc0c312e76f","timestamp":"2026-06-05T06:37:24.032Z","toolUseResult":{"plan":"# Fix: WAL files are never reset on shutdown (continuous growth across restarts)\n\n## Context\n\nThe metric store (`pkg/metricstore`) uses a WAL + periodic binary-snapshot\ncheckpoint scheme for crash recovery. Each host has an append-only\n`checkpoints/<cluster>/<host>/current.wal` that records every metric write, plus\nperiodic `<ts>.bin` full-tree snapshots. On startup the newest `.bin` is loaded\nand `current.wal` is replayed on top.\n\nA `current.wal` is only meant to hold writes *since the last snapshot*. Once a\nsnapshot is written, the WAL is redundant and must be rotated (deleted). The user\nreports that WAL files are never reset and grow without bound after a start.\n\n## Root cause\n\nWAL rotation happens in exactly these places today:\n\n1. **Periodic checkpoint** — `Checkpointing()` in `pkg/metricstore/checkpoint.go:128-145`\n   writes snapshots via `ToCheckpointWAL`, then calls `RotateWALFiles(hostDirs)`\n   for the hosts that got a fresh snapshot. This path works, but the default\n   `checkpoint-interval` is **12h**, so the WAL grows for up to 12h between resets.\n2. **Force-rotate on size** — in `WALStaging`/`processMsg`\n   (`pkg/metricstore/walCheckpoint.go:255`) when `ws.size >= MaxWALSize`. But\n   `MaxWALSize` (`config.go:69`) defaults to `0` = unlimited, so this never fires\n   unless explicitly configured.\n3. **Shutdown** — `Shutdown()` in `pkg/metricstore/metricstore.go:310-315`.\n\nThe **shutdown path is broken**. It writes a final snapshot but never rotates the\nWAL:\n\n```go\nif Keys.Checkpoints.FileFormat == \"wal\" {\n    // WAL files are deleted per-host inside ToCheckpointWAL workers.   <-- FALSE\n    files, _, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n}\n```\n\n- The comment is incorrect: `ToCheckpointWAL` / `toCheckpointBinary`\n  (`walCheckpoint.go:667`, `:768`) only write `.bin` snapshots; they do **not**\n  touch `current.wal`.\n- The second return value (`successDirs` — hosts that got a fresh snapshot) is\n  discarded with `_`.\n- The purpose-built helper `RotateWALFilesAfterShutdown(hostDirs)`\n  (`walCheckpoint.go:406`), which directly `os.Remove`s `current.wal` files after\n  the staging goroutines have exited, is **defined but never called** (verified by\n  grep across `cmd/`, `internal/`, `pkg/`).\n\nConsequence: after each clean shutdown the `current.wal` files remain on disk. On\nthe next startup they are replayed (redundantly, since the `.bin` already has that\ndata) and then **appended to again** (the staging goroutine opens the existing\nfile with `O_APPEND`). Across restarts the WAL grows monotonically and is only\never reset if a 12h periodic checkpoint happens to run. This is the reported\n\"not reset / continuously grows after a start\" behavior.\n\nNote on ordering: in `Shutdown()` the WAL staging goroutines are already stopped\n(channels closed + `WaitForWALStagingDrain()`) *before* the final\n`ToCheckpointWAL`. So the channel-based `RotateWALFiles` is unsafe here — that is\nexactly why the direct-removal `RotateWALFilesAfterShutdown` variant exists.\n\n## Fix\n\nIn `pkg/metricstore/metricstore.go`, `Shutdown()` (the `FileFormat == \"wal\"`\nbranch, ~line 310): capture the `successDirs` return from `ToCheckpointWAL` and\nrotate those WAL files after the snapshot is durably written.\n\n```go\nif Keys.Checkpoints.FileFormat == \"wal\" {\n    var successDirs []string\n    files, successDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n    // Staging goroutines have already exited, so remove the now-redundant\n    // current.wal files directly (channel-based RotateWALFiles is unsafe here).\n    RotateWALFilesAfterShutdown(successDirs)\n} else {\n    files, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n}\n```\n\nRotate **only `successDirs`** (hosts that received a fresh snapshot), mirroring the\nperiodic path. A host that produced no snapshot (`ErrNoNewArchiveData`) had no new\nunarchived data for the window, so its WAL is left untouched to avoid dropping any\nrecord not yet captured by a snapshot. Remove/replace the misleading comment.\n\n### Files\n- `pkg/metricstore/metricstore.go` — `Shutdown()` WAL branch (only change needed).\n\n### Reused existing code\n- `RotateWALFilesAfterShutdown([]string)` — `pkg/metricstore/walCheckpoint.go:406`\n  (already implemented; just needs to be wired in).\n- `successDirs` return of `ToCheckpointWAL` — `walCheckpoint.go:667`.\n\n## Verification\n\n1. Build: `go build ./...`\n2. Targeted unit test (add to `pkg/metricstore`): write a few metrics so a host\n   WAL exists, run a checkpoint + `Shutdown()` equivalent, then assert\n   `current.wal` no longer exists (or is recreated empty) for hosts that were\n   snapshotted. Run `go test ./pkg/metricstore/...`.\n3. Manual end-to-end:\n   - Configure `checkpoints.file-format: \"wal\"` (default) with a short\n     `checkpoint-interval` is *not* required for this test.\n   - Start `cc-backend`, ingest some metrics, confirm\n     `var/checkpoints/<cluster>/<host>/current.wal` grows.\n   - Stop the server (graceful shutdown) and confirm a new `<ts>.bin` appears and\n     `current.wal` is gone for active hosts.\n   - Restart, ingest more, stop again — confirm the WAL does not accumulate the\n     previous run's bytes (size resets each clean shutdown rather than growing\n     monotonically).\n\n## Out of scope / follow-ups (mention only)\n- The 12h default `checkpoint-interval` still bounds in-run WAL growth; operators\n  who want tighter bounds can lower it or set `checkpoints.max-wal-size`. No code\n  change proposed here unless requested.\n","isAgent":false,"filePath":"/Users/jan/.claude/plans/this-application-uses-a-shiny-flame.md"},"sourceToolAssistantUUID":"9643ca2e-b89a-4220-a42a-fac51f89f8c4","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
+{"parentUuid":"708b268f-f868-4386-a4de-dcc0c312e76f","isSidechain":false,"attachment":{"type":"plan_mode_exit","planFilePath":"/Users/jan/.claude/plans/this-application-uses-a-shiny-flame.md","planExists":true},"type":"attachment","uuid":"e91135d1-d94a-4a66-a716-ff7530226610","timestamp":"2026-06-05T06:37:24.100Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
+{"parentUuid":"e91135d1-d94a-4a66-a716-ff7530226610","isSidechain":false,"type":"system","subtype":"informational","content":"Auto mode lets Claude handle permission prompts automatically — Claude checks each tool call for risky actions and prompt injection before executing. Actions Claude identifies as safe are executed, while actions Claude identifies as risky are blocked and Claude may try a different approach. Ideal for long-running tasks. Sessions are slightly more expensive. Claude can make mistakes that allow harmful commands to run, it's recommended to only use in isolated environments. Shift+Tab to change mode.","isMeta":false,"timestamp":"2026-06-05T06:37:24.900Z","uuid":"ca385019-3a84-47d5-b38f-f664144d3ebc","level":"notice","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
+{"type":"ai-title","aiTitle":"fix-wal-reset-on-shutdown","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63"}
+{"type":"agent-name","agentName":"fix-wal-reset-on-shutdown","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63"}
+{"parentUuid":"ca385019-3a84-47d5-b38f-f664144d3ebc","isSidechain":false,"message":{"model":"claude-opus-4-8","id":"msg_01GPtCTPzdJGT4q3jaB6KvoD","type":"message","role":"assistant","content":[{"type":"text","text":"Let me read the exact lines in `Shutdown()` and apply the fix."}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":86,"cache_creation_input_tokens":3151,"cache_read_input_tokens":90932,"output_tokens":157,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":3151,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":86,"output_tokens":157,"cache_read_input_tokens":90932,"cache_creation_input_tokens":3151,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":3151},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011CbjejjnMxXBD52TYMHgYq","type":"assistant","uuid":"2104af48-e579-48fd-90a8-8c8972b523c7","timestamp":"2026-06-05T06:37:26.100Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
+{"parentUuid":"6e751d4c-3e5c-4323-a267-2c982a529745","isSidechain":false,"promptId":"bf1a2a8c-5f1a-4688-91c9-f9d2413ee03d","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01V1bMszopZkaZCKyEkQYNWH","type":"tool_result","content":"299\t\tcclog.Infof(\"[METRICSTORE]> Writing checkpoint to '%s'...\", Keys.Checkpoints.RootDir)\n300\t\tcheckpointStart := time.Now()\n301\t\tvar files int\n302\t\tvar err error\n303\t\n304\t\tms := GetMemoryStore()\n305\t\n306\t\tlastCheckpointMu.Lock()\n307\t\tfrom := lastCheckpoint\n308\t\tlastCheckpointMu.Unlock()\n309\t\n310\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n311\t\t\t// WAL files are deleted per-host inside ToCheckpointWAL workers.\n312\t\t\tfiles, _, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n313\t\t} else {\n314\t\t\tfiles, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n315\t\t}\n316\t\n317\t\tif err != nil {\n318\t\t\tcclog.Errorf(\"[METRICSTORE]> Writing checkpoint failed: %s\", err.Error())\n319\t\t}\n320\t\tcclog.Infof(\"[METRICSTORE]> Done! (%d files written in %v, total shutdown: %v)\", files, time.Since(checkpointStart), time.Since(totalStart))"}]},"uuid":"2f329443-cb0f-4463-9395-eb67dbbece6d","timestamp":"2026-06-05T06:37:27.498Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/metricstore.go","content":"\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))","numLines":22,"startLine":299,"totalLines":815}},"sourceToolAssistantUUID":"6e751d4c-3e5c-4323-a267-2c982a529745","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
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+{"parentUuid":"193e82b9-9784-4dca-b629-31f337d22fe3","isSidechain":false,"message":{"model":"claude-opus-4-8","id":"msg_01QA4TqzmNRV4w1ZtxQvZR5F","type":"message","role":"assistant","content":[{"type":"text","text":"Build passes. (The `walCheckpoint.go:659` lint warning is pre-existing in `joinSelector`, unrelated to this change.)\n\n## Done\n\nThe fix is in `pkg/metricstore/metricstore.go`, `Shutdown()`:\n\n```go\nif Keys.Checkpoints.FileFormat == \"wal\" {\n    var successDirs []string\n    files, successDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n    // ... remove now-redundant current.wal files directly ...\n    RotateWALFilesAfterShutdown(successDirs)\n} else {\n    ...\n}\n```\n\n**What was wrong:** On graceful shutdown the final `.bin` snapshot was written, but the `successDirs` return was discarded (`_`) and the WAL was never rotated. The old comment claimed `ToCheckpointWAL` deletes WAL files — it doesn't. The purpose-built `RotateWALFilesAfterShutdown` helper existed but was never called. So `current.wal` survived every clean shutdown, got replayed *and re-appended to* on the next start, and only ever reset at the 12h periodic checkpoint — hence unbounded growth across restarts.\n\n**The change:** capture `successDirs` and rotate exactly those hosts' WAL files (mirroring the periodic-checkpoint path; staging goroutines are already stopped, so the direct-removal variant is correct here). Hosts with no fresh snapshot are deliberately left untouched so no uncaptured records are dropped.\n\nYou can verify end-to-end per the plan: start → ingest → stop (confirm `<ts>.bin` appears and `current.wal` is gone for active hosts) → restart/ingest/stop again → confirm WAL size resets each clean shutdown instead of accumulating."}],"stop_reason":"end_turn","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":87,"cache_creation_input_tokens":235,"cache_read_input_tokens":95351,"output_tokens":729,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":235,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":87,"output_tokens":729,"cache_read_input_tokens":95351,"cache_creation_input_tokens":235,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":235},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011CbjekmP8vePhRg5w7wUbU","type":"assistant","uuid":"0a44dca6-8571-4ec6-9244-475cee817e6a","timestamp":"2026-06-05T06:37:47.574Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
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Depending on your database size (more then 40GB) the\n13\t`VACUUM` may take up to 2h. You can also run the `ANALYZE` command manually.\n14\tWhile we are confident that the memory issue with the metricstore cleanup move\n15\tpolicy is fixed, it is still recommended to use delete policy for cleanup.\n16\tThis is also the default.\n17\t\n18\t## Changes in 1.5.4\n19\t\n20\t### Security fixes\n21\t\n22\t- **JWT HMAC empty-key bypass (critical)**: `jwtSession.go` now refuses to\n23\t  register when `CROSS_LOGIN_JWT_HS512_KEY` is unset. Previously, an empty HMAC\n24\t  key allowed unauthenticated admin token forgery because `golang-jwt` verifies\n25\t  any HS256/HS512 signature against an empty key.\n26\t- **SQL injection via metric names (critical)**: Metric names supplied through\n27\t  GraphQL (`[String!]`) were interpolated raw into `json_extract` SQL expressions.\n28\t  Names are now validated against `^[a-zA-Z0-9_]+$` in\n29\t  `jobsMetricStatisticsHistogram` and `buildFloatJSONCondition`.\n30\t- **Path traversal via line-protocol tags (critical)**: `cluster` and `host`\n31\t  tags from the metric line protocol flowed unvalidated into `path.Join` for\n32\t  checkpoint/WAL file paths, enabling arbitrary file writes outside the\n33\t  checkpoint root via NATS (unauthenticated) or `POST /api/write`. Path-traversal\n34\t  sequences are now rejected in `DecodeLine` before the tags become path\n35\t  components.\n36\t- **CORS `AllowCredentials` disabled**: CORS middleware no longer sets\n37\t  `AllowCredentials: true`, which was incompatible with `AllowedOrigins: [\"*\"]`\n38\t  and could enable cross-origin credential theft.\n39\t- **HSTS header added**: `Strict-Transport-Security` is now set for all\n40\t  HTTPS connections.\n41\t- **Security response headers**: Added `X-Content-Type-Options: nosniff`,\n42\t  `X-Frame-Options: DENY`, `Referrer-Policy: same-origin`, and a conservative\n43\t  `Content-Security-Policy` (blocks `frame-ancestors`, `object-src`, `base-uri`)\n44\t  to harden against clickjacking and base-tag injection.\n45\t- **Stored XSS in job message**: `job.metaData.message` is now rendered as\n46\t  escaped text (CSS `white-space: pre-wrap`) instead of raw `{@html ...}` in\n47\t  `Job.root` and `JobFootprint`.\n48\t- **SQL injection in tag queries**: The tag-scope `IN` list and manager project\n49\t  subquery in `CountTags` are now parameterized instead of interpolating\n50\t  `user.Username` / `user.Projects` values sourced from OIDC/LDAP.\n51\t- **GraphQL DoS hardening**: Query cost is bounded with `FixedComplexityLimit`\n52\t  (5000). Non-positive `items-per-page` and `page` values are rejected with HTTP\n53\t  400 to prevent integer underflow into unbounded `LIMIT`/`OFFSET` queries.\n54\t- **CSRF defense-in-depth**: State-changing requests with a cross-site\n55\t  `Sec-Fetch-Site` header are now rejected (fails open for non-browser clients),\n56\t  complementing the existing `SameSite=Lax` session cookie.\n57\t- **NATS API security warning**: A startup warning is now logged when NATS\n58\t  subscriptions are enabled, reminding operators that the NATS API has no\n59\t  application-layer authentication and that publish ACLs must be restricted at\n60\t  the broker."}]},"uuid":"895dc912-d284-4a9a-bd30-8e3e019fc322","timestamp":"2026-06-05T06:57:02.471Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/ReleaseNotes.md","content":"# `cc-backend` version 1.5.4\n\nSupports job archive version 3 and database version 11.\n\nThis is a security and bugfix release of `cc-backend`, the API backend and\nfrontend implementation of ClusterCockpit.\nFor release specific notes visit the [ClusterCockpit Documentation](https://clusterockpit.org/docs/release/).\nIf you are upgrading from v1.5.1 no database migration is required.\nIf you are upgrading from v1.5.0 you need to do another DB migration. This\nshould not take long. For optimal database performance after the migration it is\nrecommended to apply the new `optimize-db` flag, which runs the sqlite `ANALYZE`\nand `VACUUM` commands. Depending on your database size (more then 40GB) the\n`VACUUM` may take up to 2h. You can also run the `ANALYZE` command manually.\nWhile we are confident that the memory issue with the metricstore cleanup move\npolicy is fixed, it is still recommended to use delete policy for cleanup.\nThis is also the default.\n\n## Changes in 1.5.4\n\n### Security fixes\n\n- **JWT HMAC empty-key bypass (critical)**: `jwtSession.go` now refuses to\n  register when `CROSS_LOGIN_JWT_HS512_KEY` is unset. Previously, an empty HMAC\n  key allowed unauthenticated admin token forgery because `golang-jwt` verifies\n  any HS256/HS512 signature against an empty key.\n- **SQL injection via metric names (critical)**: Metric names supplied through\n  GraphQL (`[String!]`) were interpolated raw into `json_extract` SQL expressions.\n  Names are now validated against `^[a-zA-Z0-9_]+$` in\n  `jobsMetricStatisticsHistogram` and `buildFloatJSONCondition`.\n- **Path traversal via line-protocol tags (critical)**: `cluster` and `host`\n  tags from the metric line protocol flowed unvalidated into `path.Join` for\n  checkpoint/WAL file paths, enabling arbitrary file writes outside the\n  checkpoint root via NATS (unauthenticated) or `POST /api/write`. Path-traversal\n  sequences are now rejected in `DecodeLine` before the tags become path\n  components.\n- **CORS `AllowCredentials` disabled**: CORS middleware no longer sets\n  `AllowCredentials: true`, which was incompatible with `AllowedOrigins: [\"*\"]`\n  and could enable cross-origin credential theft.\n- **HSTS header added**: `Strict-Transport-Security` is now set for all\n  HTTPS connections.\n- **Security response headers**: Added `X-Content-Type-Options: nosniff`,\n  `X-Frame-Options: DENY`, `Referrer-Policy: same-origin`, and a conservative\n  `Content-Security-Policy` (blocks `frame-ancestors`, `object-src`, `base-uri`)\n  to harden against clickjacking and base-tag injection.\n- **Stored XSS in job message**: `job.metaData.message` is now rendered as\n  escaped text (CSS `white-space: pre-wrap`) instead of raw `{@html ...}` in\n  `Job.root` and `JobFootprint`.\n- **SQL injection in tag queries**: The tag-scope `IN` list and manager project\n  subquery in `CountTags` are now parameterized instead of interpolating\n  `user.Username` / `user.Projects` values sourced from OIDC/LDAP.\n- **GraphQL DoS hardening**: Query cost is bounded with `FixedComplexityLimit`\n  (5000). Non-positive `items-per-page` and `page` values are rejected with HTTP\n  400 to prevent integer underflow into unbounded `LIMIT`/`OFFSET` queries.\n- **CSRF defense-in-depth**: State-changing requests with a cross-site\n  `Sec-Fetch-Site` header are now rejected (fails open for non-browser clients),\n  complementing the existing `SameSite=Lax` session cookie.\n- **NATS API security warning**: A startup warning is now logged when NATS\n  subscriptions are enabled, reminding operators that the NATS API has no\n  application-layer authentication and that publish ACLs must be restricted at\n  the broker.","numLines":60,"startLine":1,"totalLines":561}},"sourceToolAssistantUUID":"3e2b1e05-7ffe-4d7b-b855-538b850e2588","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"fc14d957-e68b-4e12-97de-df33bed3cd63","version":"2.1.162","gitBranch":"release/v1.5","slug":"this-application-uses-a-shiny-flame"}
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Roles are now always\n86\t  requested from the token regardless of other configuration.\n87\t- **OIDC user sync role changes**: `SyncUser` and `UpdateUser` callbacks now\n88\t  allow all role changes, removing a restriction that prevented role updates\n89\t  during OIDC-driven user synchronization.\n90\t- **OIDC projects array**: Projects array from the OIDC token is now submitted\n91\t  and applied when syncing user attributes.\n92\t- **WAL message drops during checkpoint**: WAL writes are now paused during\n93\t  binary checkpoint creation. Previously, disk I/O contention between\n94\t  checkpoint writes and WAL staging caused over 1.4 million dropped messages\n95\t  per checkpoint cycle.\n96\t- **WAL rotation skipped for all nodes**: `RotateWALFiles` used a non-blocking\n97\t  send on a small channel. With thousands of nodes, the channel filled instantly\n98\t  and nearly all hosts were skipped, leaving WAL files unrotated. Replaced with\n99\t  a blocking send using a shared 2-minute deadline.\n100\t- **Log viewer auto-refresh**: Fixed the log viewer component not auto-refreshing\n101\t  correctly.\n102\t- **SameSite cookie setting**: Relaxed the SameSite cookie attribute to improve\n103\t  compatibility with OIDC redirect flows.\n104\t- **WAL not rotated on partial checkpoint failure**: When binary checkpointing\n105\t  failed for some hosts, WAL files for successfully checkpointed hosts were not\n106\t  rotated and the checkpoint timestamp was not advanced. Partial successes now\n107\t  correctly advance the checkpoint and rotate WAL files for completed hosts.\n108\t- **Unbounded WAL file growth**: If binary checkpointing consistently failed for\n109\t  a host, its `current.wal` file grew without limit until disk exhaustion. A new\n110\t  `max-wal-size` configuration option (in the `checkpoints` block) allows setting\n111\t  a per-host WAL size cap in bytes. 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Improved validation and UI text for \"more than equal\" and\n116\t  \"less than equal\" range selections.\n117\t- **Lineprotocol body parsing interrupted**: Switched from `ReadTimeout` to\n118\t  `ReadHeaderTimeout` so that long-running metric submissions are no longer\n119\t  cut off mid-stream."}]},"uuid":"9e0885ae-34d6-40b1-b456-85641a4fe797","timestamp":"2026-06-05T06:57:05.598Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/ReleaseNotes.md","content":"  the broker.\n\n### Bug fixes\n\n- **Roofline legend placement**: Roofline plot legends now use fixed\n  coordinates instead of dynamic placement, preventing the legend from\n  overlapping data points or being rendered off-canvas (#546).\n- **Subcluster usage tab labels**: Subcluster names in the status dashboard\n  usage tabs are no longer force-capitalized; the original cluster-defined\n  casing is preserved.\n- **NodeListRow host filter**: The running-jobs query in the node list row now\n  filters by exact node hostname (`eq`) instead of substring match\n  (`contains`), avoiding incorrect matches when one hostname is a prefix of\n  another.\n\n### Dependencies\n\n- **Go module upgrades**: Refreshed Go module dependencies to their latest\n  compatible versions.\n\n## Changes in 1.5.3\n\n### Bug fixes\n\n- **OIDC role extraction**: Fixed role extraction from OIDC tokens where roles\n  were not correctly parsed from the token claims. 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new file mode 100644
index 00000000..f7f7356a
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+++ b/05/1ff3c0d253/0/metadata.json
@@ -0,0 +1,36 @@
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+  "branch": "release/v1.5",
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+  "files_touched": [
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+    "turn_count": 2
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+    "calculated_at": "2026-06-05T07:01:47.691053Z",
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diff --git a/05/1ff3c0d253/0/prompt.txt b/05/1ff3c0d253/0/prompt.txt
new file mode 100644
index 00000000..84e49962
--- /dev/null
+++ b/05/1ff3c0d253/0/prompt.txt
@@ -0,0 +1 @@
+Update the releasenotes with this bugfix. Leave the version as is.
\ No newline at end of file
diff --git a/05/1ff3c0d253/metadata.json b/05/1ff3c0d253/metadata.json
new file mode 100644
index 00000000..402bb68f
--- /dev/null
+++ b/05/1ff3c0d253/metadata.json
@@ -0,0 +1,25 @@
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+  "files_touched": [
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