VictoriaMetrics/lib/storage/inmemory_part.go

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package storage
import (
"path/filepath"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/cgroup"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
)
// inmemoryPart represents in-memory partition.
type inmemoryPart struct {
ph partHeader
timestampsData bytesutil.ByteBuffer
valuesData bytesutil.ByteBuffer
indexData bytesutil.ByteBuffer
metaindexData bytesutil.ByteBuffer
creationTime uint64
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}
// Reset resets mp.
func (mp *inmemoryPart) Reset() {
mp.ph.Reset()
mp.timestampsData.Reset()
mp.valuesData.Reset()
mp.indexData.Reset()
mp.metaindexData.Reset()
mp.creationTime = 0
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}
// MustStoreToDisk stores the mp to the given path on disk.
func (mp *inmemoryPart) MustStoreToDisk(path string) {
fs.MustMkdirFailIfExist(path)
timestampsPath := filepath.Join(path, timestampsFilename)
fs.MustWriteSync(timestampsPath, mp.timestampsData.B)
valuesPath := filepath.Join(path, valuesFilename)
fs.MustWriteSync(valuesPath, mp.valuesData.B)
indexPath := filepath.Join(path, indexFilename)
fs.MustWriteSync(indexPath, mp.indexData.B)
metaindexPath := filepath.Join(path, metaindexFilename)
fs.MustWriteSync(metaindexPath, mp.metaindexData.B)
mp.ph.MustWriteMetadata(path)
fs.MustSyncPath(path)
// Do not sync parent directory - it must be synced by the caller.
}
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// InitFromRows initializes mp from the given rows.
func (mp *inmemoryPart) InitFromRows(rows []rawRow) {
if len(rows) == 0 {
logger.Panicf("BUG: Inmemory.InitFromRows must accept at least one row")
}
mp.Reset()
rrm := getRawRowsMarshaler()
rrm.marshalToInmemoryPart(mp, rows)
putRawRowsMarshaler(rrm)
mp.creationTime = fasttime.UnixTimestamp()
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}
// NewPart creates new part from mp.
//
// It is safe calling NewPart multiple times.
// It is unsafe re-using mp while the returned part is in use.
func (mp *inmemoryPart) NewPart() (*part, error) {
size := mp.size()
return newPart(&mp.ph, "", size, mp.metaindexData.NewReader(), &mp.timestampsData, &mp.valuesData, &mp.indexData)
}
func (mp *inmemoryPart) size() uint64 {
return uint64(cap(mp.timestampsData.B) + cap(mp.valuesData.B) + cap(mp.indexData.B) + cap(mp.metaindexData.B))
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}
func getInmemoryPart() *inmemoryPart {
select {
case mp := <-mpPool:
return mp
default:
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return &inmemoryPart{}
}
}
func putInmemoryPart(mp *inmemoryPart) {
mp.Reset()
select {
case mpPool <- mp:
default:
// Drop mp in order to reduce memory usage.
}
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}
// Use chan instead of sync.Pool in order to reduce memory usage on systems with big number of CPU cores,
// since sync.Pool maintains per-CPU pool of inmemoryPart objects.
//
// The inmemoryPart object size can exceed 64KB, so it is better to use chan instead of sync.Pool for reducing memory usage.
var mpPool = make(chan *inmemoryPart, cgroup.AvailableCPUs())