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Add buffered I/O to WAL writes and fix MemoryCap comment

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WAL writes now go through bufio.Writer instead of raw syscalls per record,
reducing I/O overhead. Buffers are flushed on rotate, drain, and shutdown.
Fixed misleading MemoryCap comment ("Max bytes" → "Max memory in GB").

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Entire-Checkpoint: b38dc35e5334
This commit is contained in:
Jan Eitzinger
2026-03-13 09:05:24 +01:00
parent a4f9ba6975
commit b214e1755a
2 changed files with 33 additions and 20 deletions
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17
pkg/metricstore/config.go
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@@ -113,7 +113,7 @@ type Subscriptions []struct {
// Fields:
// - NumWorkers: Parallel workers for checkpoint/archive (0 = auto: min(NumCPU/2+1, 10))
// - RetentionInMemory: Duration string (e.g., "48h") for in-memory data retention
// - MemoryCap: Max bytes for buffer data (0 = unlimited); triggers forceFree when exceeded
// - MemoryCap: Max memory in GB for buffer data (0 = unlimited); triggers forceFree when exceeded
// - Checkpoints: Periodic persistence configuration
// - Debug: Development/profiling options (nil = disabled)
// - Archive: Long-term storage configuration (nil = disabled)
@@ -121,13 +121,14 @@ type Subscriptions []struct {
type MetricStoreConfig struct {
// Number of concurrent workers for checkpoint and archive operations.
// If not set or 0, defaults to min(runtime.NumCPU()/2+1, 10)
NumWorkers int `json:"num-workers"`
RetentionInMemory string `json:"retention-in-memory"`
MemoryCap int `json:"memory-cap"`
Checkpoints Checkpoints `json:"checkpoints"`
Debug *Debug `json:"debug"`
Cleanup *Cleanup `json:"cleanup"`
Subscriptions *Subscriptions `json:"nats-subscriptions"`
NumWorkers int `json:"num-workers"`
RetentionInMemory string `json:"retention-in-memory"`
CheckpointInterval string `json:"checkpoint-interval,omitempty"`
MemoryCap int `json:"memory-cap"`
Checkpoints Checkpoints `json:"checkpoints"`
Debug *Debug `json:"debug"`
Cleanup *Cleanup `json:"cleanup"`
Subscriptions *Subscriptions `json:"nats-subscriptions"`
}
// Keys is the global metricstore configuration instance.