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2a8395be05
When WriteFileAndSync fails, then the caller eventually logs the error message
and exits. The error message returned by WriteFileAndSync already contains the path
to the file, which couldn't be created. This information alongside the call stack
is enough for debugging the issue. So just use log.Panicf("FATAL: ...") inside MustWriteAndSync().
This simplifies error handling at caller side a bit.
110 lines
3 KiB
Go
110 lines
3 KiB
Go
package storage
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import (
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"fmt"
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"path/filepath"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/cgroup"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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)
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// inmemoryPart represents in-memory partition.
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type inmemoryPart struct {
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ph partHeader
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timestampsData bytesutil.ByteBuffer
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valuesData bytesutil.ByteBuffer
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indexData bytesutil.ByteBuffer
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metaindexData bytesutil.ByteBuffer
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creationTime uint64
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}
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// Reset resets mp.
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func (mp *inmemoryPart) Reset() {
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mp.ph.Reset()
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mp.timestampsData.Reset()
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mp.valuesData.Reset()
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mp.indexData.Reset()
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mp.metaindexData.Reset()
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mp.creationTime = 0
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}
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// StoreToDisk stores the mp to the given path on disk.
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func (mp *inmemoryPart) StoreToDisk(path string) error {
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if err := fs.MkdirAllIfNotExist(path); err != nil {
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return fmt.Errorf("cannot create directory %q: %w", path, err)
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}
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timestampsPath := filepath.Join(path, timestampsFilename)
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fs.MustWriteFileAndSync(timestampsPath, mp.timestampsData.B)
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valuesPath := filepath.Join(path, valuesFilename)
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fs.MustWriteFileAndSync(valuesPath, mp.valuesData.B)
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indexPath := filepath.Join(path, indexFilename)
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fs.MustWriteFileAndSync(indexPath, mp.indexData.B)
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metaindexPath := filepath.Join(path, metaindexFilename)
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fs.MustWriteFileAndSync(metaindexPath, mp.metaindexData.B)
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mp.ph.MustWriteMetadata(path)
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fs.MustSyncPath(path)
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// Do not sync parent directory - it must be synced by the caller.
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return nil
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}
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// InitFromRows initializes mp from the given rows.
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func (mp *inmemoryPart) InitFromRows(rows []rawRow) {
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if len(rows) == 0 {
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logger.Panicf("BUG: Inmemory.InitFromRows must accept at least one row")
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}
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mp.Reset()
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rrm := getRawRowsMarshaler()
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rrm.marshalToInmemoryPart(mp, rows)
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putRawRowsMarshaler(rrm)
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mp.creationTime = fasttime.UnixTimestamp()
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}
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// NewPart creates new part from mp.
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//
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// It is safe calling NewPart multiple times.
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// It is unsafe re-using mp while the returned part is in use.
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func (mp *inmemoryPart) NewPart() (*part, error) {
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size := mp.size()
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return newPart(&mp.ph, "", size, mp.metaindexData.NewReader(), &mp.timestampsData, &mp.valuesData, &mp.indexData)
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}
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func (mp *inmemoryPart) size() uint64 {
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return uint64(cap(mp.timestampsData.B) + cap(mp.valuesData.B) + cap(mp.indexData.B) + cap(mp.metaindexData.B))
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}
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func getInmemoryPart() *inmemoryPart {
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select {
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case mp := <-mpPool:
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return mp
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default:
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return &inmemoryPart{}
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}
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}
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func putInmemoryPart(mp *inmemoryPart) {
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mp.Reset()
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select {
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case mpPool <- mp:
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default:
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// Drop mp in order to reduce memory usage.
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}
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}
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// Use chan instead of sync.Pool in order to reduce memory usage on systems with big number of CPU cores,
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// since sync.Pool maintains per-CPU pool of inmemoryPart objects.
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//
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// The inmemoryPart object size can exceed 64KB, so it is better to use chan instead of sync.Pool for reducing memory usage.
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var mpPool = make(chan *inmemoryPart, cgroup.AvailableCPUs())
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