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8189770c50
The main purpose of this command-line flag is to increase the lifetime of low-end flash storage with the limited number of write operations it can perform. Such flash storage is usually installed on Raspberry PI or similar appliances. For example, `-inmemoryDataFlushInterval=1h` reduces the frequency of disk write operations to up to once per hour if the ingested one-hour worth of data fits the limit for in-memory data. The in-memory data is searchable in the same way as the data stored on disk. VictoriaMetrics automatically flushes the in-memory data to disk on graceful shutdown via SIGINT signal. The in-memory data is lost on unclean shutdown (hardware power loss, OOM crash, SIGKILL). Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3337
117 lines
3.4 KiB
Go
117 lines
3.4 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 := path + "/timestamps.bin"
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if err := fs.WriteFileAndSync(timestampsPath, mp.timestampsData.B); err != nil {
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return fmt.Errorf("cannot store timestamps: %w", err)
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}
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valuesPath := path + "/values.bin"
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if err := fs.WriteFileAndSync(valuesPath, mp.valuesData.B); err != nil {
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return fmt.Errorf("cannot store values: %w", err)
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}
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indexPath := path + "/index.bin"
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if err := fs.WriteFileAndSync(indexPath, mp.indexData.B); err != nil {
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return fmt.Errorf("cannot store index: %w", err)
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}
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metaindexPath := path + "/metaindex.bin"
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if err := fs.WriteFileAndSync(metaindexPath, mp.metaindexData.B); err != nil {
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return fmt.Errorf("cannot store metaindex: %w", err)
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}
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if err := mp.ph.writeMinDedupInterval(path); err != nil {
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return fmt.Errorf("cannot store min dedup interval: %w", err)
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}
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// Sync parent directory in order to make sure the written files remain visible after hardware reset
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parentDirPath := filepath.Dir(path)
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fs.MustSyncPath(parentDirPath)
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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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