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Callers of InitFromFilePart log the error and exit. It is better to log the error with the path to the part and the call stack directly inside the MustInitFromFilePart() function. This simplifies the code at callers' side while leaving the same level of debuggability.
107 lines
2.9 KiB
Go
107 lines
2.9 KiB
Go
package storage
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import (
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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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// MustStoreToDisk stores the mp to the given path on disk.
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func (mp *inmemoryPart) MustStoreToDisk(path string) {
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fs.MustMkdirFailIfExist(path)
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timestampsPath := filepath.Join(path, timestampsFilename)
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fs.MustWriteSync(timestampsPath, mp.timestampsData.B)
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valuesPath := filepath.Join(path, valuesFilename)
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fs.MustWriteSync(valuesPath, mp.valuesData.B)
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indexPath := filepath.Join(path, indexFilename)
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fs.MustWriteSync(indexPath, mp.indexData.B)
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metaindexPath := filepath.Join(path, metaindexFilename)
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fs.MustWriteSync(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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}
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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 {
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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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