mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-23 12:31:07 +01:00
7a62eefa34
This allows reducing the amounts of data, which must be read during queries over logs with big number of fields (aka "wide events"). This, in turn, improves query performance when the data, which needs to be scanned during the query, doesn't fit OS page cache.
516 lines
17 KiB
Go
516 lines
17 KiB
Go
package logstorage
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import (
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"path/filepath"
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"sync"
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"github.com/cespare/xxhash/v2"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/filestream"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/slicesutil"
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)
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type readerWithStats struct {
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r filestream.ReadCloser
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bytesRead uint64
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}
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func (r *readerWithStats) reset() {
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r.r = nil
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r.bytesRead = 0
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}
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func (r *readerWithStats) init(rc filestream.ReadCloser) {
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r.reset()
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r.r = rc
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}
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// Path returns the path to r file
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func (r *readerWithStats) Path() string {
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return r.r.Path()
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}
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// MustReadFull reads len(data) to r.
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func (r *readerWithStats) MustReadFull(data []byte) {
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fs.MustReadData(r.r, data)
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r.bytesRead += uint64(len(data))
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}
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func (r *readerWithStats) Read(p []byte) (int, error) {
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n, err := r.r.Read(p)
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r.bytesRead += uint64(n)
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return n, err
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}
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func (r *readerWithStats) MustClose() {
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if r.r != nil {
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r.r.MustClose()
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r.r = nil
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}
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}
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// streamReaders contains readers for blockStreamReader
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type streamReaders struct {
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columnNamesReader readerWithStats
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metaindexReader readerWithStats
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indexReader readerWithStats
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columnsHeaderIndexReader readerWithStats
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columnsHeaderReader readerWithStats
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timestampsReader readerWithStats
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messageBloomValuesReader bloomValuesReader
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oldBloomValuesReader bloomValuesReader
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bloomValuesShards []bloomValuesReader
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}
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type bloomValuesReader struct {
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bloom readerWithStats
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values readerWithStats
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}
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func (r *bloomValuesReader) reset() {
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r.bloom.reset()
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r.values.reset()
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}
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func (r *bloomValuesReader) init(sr bloomValuesStreamReader) {
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r.bloom.init(sr.bloom)
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r.values.init(sr.values)
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}
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func (r *bloomValuesReader) totalBytesRead() uint64 {
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return r.bloom.bytesRead + r.values.bytesRead
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}
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func (r *bloomValuesReader) MustClose() {
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r.bloom.MustClose()
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r.values.MustClose()
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}
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type bloomValuesStreamReader struct {
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bloom filestream.ReadCloser
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values filestream.ReadCloser
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}
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func (sr *streamReaders) reset() {
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sr.columnNamesReader.reset()
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sr.metaindexReader.reset()
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sr.indexReader.reset()
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sr.columnsHeaderIndexReader.reset()
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sr.columnsHeaderReader.reset()
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sr.timestampsReader.reset()
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sr.messageBloomValuesReader.reset()
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sr.oldBloomValuesReader.reset()
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for i := range sr.bloomValuesShards {
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sr.bloomValuesShards[i].reset()
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}
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sr.bloomValuesShards = sr.bloomValuesShards[:0]
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}
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func (sr *streamReaders) init(columnNamesReader, metaindexReader, indexReader, columnsHeaderIndexReader, columnsHeaderReader, timestampsReader filestream.ReadCloser,
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messageBloomValuesReader, oldBloomValuesReader bloomValuesStreamReader, bloomValuesShards []bloomValuesStreamReader,
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) {
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sr.columnNamesReader.init(columnNamesReader)
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sr.metaindexReader.init(metaindexReader)
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sr.indexReader.init(indexReader)
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sr.columnsHeaderIndexReader.init(columnsHeaderIndexReader)
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sr.columnsHeaderReader.init(columnsHeaderReader)
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sr.timestampsReader.init(timestampsReader)
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sr.messageBloomValuesReader.init(messageBloomValuesReader)
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sr.oldBloomValuesReader.init(oldBloomValuesReader)
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sr.bloomValuesShards = slicesutil.SetLength(sr.bloomValuesShards, len(bloomValuesShards))
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for i := range sr.bloomValuesShards {
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sr.bloomValuesShards[i].init(bloomValuesShards[i])
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}
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}
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func (sr *streamReaders) totalBytesRead() uint64 {
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n := uint64(0)
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n += sr.columnNamesReader.bytesRead
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n += sr.metaindexReader.bytesRead
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n += sr.indexReader.bytesRead
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n += sr.columnsHeaderIndexReader.bytesRead
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n += sr.columnsHeaderReader.bytesRead
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n += sr.timestampsReader.bytesRead
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n += sr.messageBloomValuesReader.totalBytesRead()
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n += sr.oldBloomValuesReader.totalBytesRead()
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for i := range sr.bloomValuesShards {
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n += sr.bloomValuesShards[i].totalBytesRead()
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}
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return n
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}
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func (sr *streamReaders) MustClose() {
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sr.columnNamesReader.MustClose()
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sr.metaindexReader.MustClose()
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sr.indexReader.MustClose()
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sr.columnsHeaderIndexReader.MustClose()
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sr.columnsHeaderReader.MustClose()
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sr.timestampsReader.MustClose()
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sr.messageBloomValuesReader.MustClose()
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sr.oldBloomValuesReader.MustClose()
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for i := range sr.bloomValuesShards {
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sr.bloomValuesShards[i].MustClose()
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}
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}
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func (sr *streamReaders) getBloomValuesReaderForColumnName(name string, partFormatVersion uint) *bloomValuesReader {
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if name == "" {
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return &sr.messageBloomValuesReader
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}
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if partFormatVersion < 1 {
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return &sr.oldBloomValuesReader
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}
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n := len(sr.bloomValuesShards)
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idx := uint64(0)
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if n > 1 {
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h := xxhash.Sum64(bytesutil.ToUnsafeBytes(name))
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idx = h % uint64(n)
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}
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return &sr.bloomValuesShards[idx]
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}
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// blockStreamReader is used for reading blocks in streaming manner from a part.
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type blockStreamReader struct {
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// blockData contains the data for the last read block
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blockData blockData
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// a contains data for blockData
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a arena
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// ph is the header for the part
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ph partHeader
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// streamReaders contains data readers in stream mode
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streamReaders streamReaders
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// columnNameIDs contains columnName->id mapping for all the column names seen in the part
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columnNameIDs map[string]uint64
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// columnNames constains id->columnName mapping for all the columns seen in the part
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columnNames []string
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// indexBlockHeaders contains the list of all the indexBlockHeader entries for the part
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indexBlockHeaders []indexBlockHeader
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// blockHeaders contains the list of blockHeader entries for the current indexBlockHeader pointed by nextIndexBlockIdx
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blockHeaders []blockHeader
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// nextIndexBlockIdx is the index of the next item to read from indexBlockHeaders
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nextIndexBlockIdx int
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// nextBlockIdx is the index of the next item to read from blockHeaders
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nextBlockIdx int
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// globalUncompressedSizeBytes is the total size of log entries seen in the part
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globalUncompressedSizeBytes uint64
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// globalRowsCount is the number of log entries seen in the part
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globalRowsCount uint64
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// globalBlocksCount is the number of blocks seen in the part
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globalBlocksCount uint64
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// sidLast is the stream id for the previously read block
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sidLast streamID
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// minTimestampLast is the minimum timestamp for the previously read block
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minTimestampLast int64
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}
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// reset resets bsr, so it can be re-used
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func (bsr *blockStreamReader) reset() {
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bsr.blockData.reset()
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bsr.a.reset()
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bsr.ph.reset()
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bsr.streamReaders.reset()
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bsr.columnNameIDs = nil
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bsr.columnNames = nil
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ihs := bsr.indexBlockHeaders
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if len(ihs) > 10e3 {
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// The ihs len is unbound, so it is better to drop too long indexBlockHeaders in order to reduce memory usage
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ihs = nil
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}
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for i := range ihs {
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ihs[i].reset()
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}
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bsr.indexBlockHeaders = ihs[:0]
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bhs := bsr.blockHeaders
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for i := range bhs {
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bhs[i].reset()
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}
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bsr.blockHeaders = bhs[:0]
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bsr.nextIndexBlockIdx = 0
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bsr.nextBlockIdx = 0
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bsr.globalUncompressedSizeBytes = 0
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bsr.globalRowsCount = 0
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bsr.globalBlocksCount = 0
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bsr.sidLast.reset()
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bsr.minTimestampLast = 0
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}
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// Path returns part path for bsr (e.g. file path, url or in-memory reference)
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func (bsr *blockStreamReader) Path() string {
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path := bsr.streamReaders.metaindexReader.Path()
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return filepath.Dir(path)
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}
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// MustInitFromInmemoryPart initializes bsr from mp.
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func (bsr *blockStreamReader) MustInitFromInmemoryPart(mp *inmemoryPart) {
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bsr.reset()
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bsr.ph = mp.ph
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// Initialize streamReaders
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columnNamesReader := mp.columnNames.NewReader()
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metaindexReader := mp.metaindex.NewReader()
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indexReader := mp.index.NewReader()
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columnsHeaderIndexReader := mp.columnsHeaderIndex.NewReader()
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columnsHeaderReader := mp.columnsHeader.NewReader()
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timestampsReader := mp.timestamps.NewReader()
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messageBloomValuesReader := mp.messageBloomValues.NewStreamReader()
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var oldBloomValuesReader bloomValuesStreamReader
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bloomValuesShards := []bloomValuesStreamReader{
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mp.fieldBloomValues.NewStreamReader(),
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}
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bsr.streamReaders.init(columnNamesReader, metaindexReader, indexReader, columnsHeaderIndexReader, columnsHeaderReader, timestampsReader,
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messageBloomValuesReader, oldBloomValuesReader, bloomValuesShards)
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// Read columnNames data
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bsr.columnNames, bsr.columnNameIDs = mustReadColumnNames(&bsr.streamReaders.columnNamesReader)
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// Read metaindex data
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bsr.indexBlockHeaders = mustReadIndexBlockHeaders(bsr.indexBlockHeaders[:0], &bsr.streamReaders.metaindexReader)
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}
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// MustInitFromFilePart initializes bsr from file part at the given path.
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func (bsr *blockStreamReader) MustInitFromFilePart(path string) {
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bsr.reset()
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// Files in the part are always read without OS cache pollution,
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// since they are usually deleted after the merge.
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const nocache = true
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bsr.ph.mustReadMetadata(path)
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columnNamesPath := filepath.Join(path, columnNamesFilename)
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metaindexPath := filepath.Join(path, metaindexFilename)
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indexPath := filepath.Join(path, indexFilename)
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columnsHeaderIndexPath := filepath.Join(path, columnsHeaderIndexFilename)
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columnsHeaderPath := filepath.Join(path, columnsHeaderFilename)
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timestampsPath := filepath.Join(path, timestampsFilename)
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// Open data readers
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var columnNamesReader filestream.ReadCloser
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if bsr.ph.FormatVersion >= 1 {
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columnNamesReader = filestream.MustOpen(columnNamesPath, nocache)
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}
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metaindexReader := filestream.MustOpen(metaindexPath, nocache)
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indexReader := filestream.MustOpen(indexPath, nocache)
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var columnsHeaderIndexReader filestream.ReadCloser
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if bsr.ph.FormatVersion >= 1 {
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columnsHeaderIndexReader = filestream.MustOpen(columnsHeaderIndexPath, nocache)
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}
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columnsHeaderReader := filestream.MustOpen(columnsHeaderPath, nocache)
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timestampsReader := filestream.MustOpen(timestampsPath, nocache)
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messageBloomFilterPath := filepath.Join(path, messageBloomFilename)
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messageValuesPath := filepath.Join(path, messageValuesFilename)
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messageBloomValuesReader := bloomValuesStreamReader{
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bloom: filestream.MustOpen(messageBloomFilterPath, nocache),
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values: filestream.MustOpen(messageValuesPath, nocache),
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}
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var oldBloomValuesReader bloomValuesStreamReader
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var bloomValuesShards []bloomValuesStreamReader
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if bsr.ph.FormatVersion < 1 {
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bloomPath := filepath.Join(path, oldBloomFilename)
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oldBloomValuesReader.bloom = filestream.MustOpen(bloomPath, nocache)
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valuesPath := filepath.Join(path, oldValuesFilename)
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oldBloomValuesReader.values = filestream.MustOpen(valuesPath, nocache)
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} else {
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bloomValuesShards = make([]bloomValuesStreamReader, bsr.ph.BloomValuesShardsCount)
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for i := range bloomValuesShards {
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shard := &bloomValuesShards[i]
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bloomPath := getBloomFilePath(path, uint64(i))
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shard.bloom = filestream.MustOpen(bloomPath, nocache)
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valuesPath := getValuesFilePath(path, uint64(i))
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shard.values = filestream.MustOpen(valuesPath, nocache)
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}
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}
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// Initialize streamReaders
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bsr.streamReaders.init(columnNamesReader, metaindexReader, indexReader, columnsHeaderIndexReader, columnsHeaderReader, timestampsReader,
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messageBloomValuesReader, oldBloomValuesReader, bloomValuesShards)
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if bsr.ph.FormatVersion >= 1 {
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// Read columnNames data
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bsr.columnNames, bsr.columnNameIDs = mustReadColumnNames(&bsr.streamReaders.columnNamesReader)
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}
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// Read metaindex data
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bsr.indexBlockHeaders = mustReadIndexBlockHeaders(bsr.indexBlockHeaders[:0], &bsr.streamReaders.metaindexReader)
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}
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// NextBlock reads the next block from bsr and puts it into bsr.blockData.
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//
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// false is returned if there are no other blocks.
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//
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// bsr.blockData is valid until the next call to NextBlock().
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func (bsr *blockStreamReader) NextBlock() bool {
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for bsr.nextBlockIdx >= len(bsr.blockHeaders) {
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if !bsr.nextIndexBlock() {
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return false
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}
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}
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ih := &bsr.indexBlockHeaders[bsr.nextIndexBlockIdx-1]
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bh := &bsr.blockHeaders[bsr.nextBlockIdx]
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th := &bh.timestampsHeader
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// Validate bh
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if bh.streamID.less(&bsr.sidLast) {
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logger.Panicf("FATAL: %s: blockHeader.streamID=%s cannot be smaller than the streamID from the previously read block: %s", bsr.Path(), &bh.streamID, &bsr.sidLast)
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}
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if bh.streamID.equal(&bsr.sidLast) && th.minTimestamp < bsr.minTimestampLast {
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logger.Panicf("FATAL: %s: timestamps.minTimestamp=%d cannot be smaller than the minTimestamp for the previously read block for the same streamID: %d",
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bsr.Path(), th.minTimestamp, bsr.minTimestampLast)
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}
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bsr.minTimestampLast = th.minTimestamp
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bsr.sidLast = bh.streamID
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if th.minTimestamp < ih.minTimestamp {
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logger.Panicf("FATAL: %s: timestampsHeader.minTimestamp=%d cannot be smaller than indexBlockHeader.minTimestamp=%d", bsr.Path(), th.minTimestamp, ih.minTimestamp)
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}
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if th.maxTimestamp > ih.maxTimestamp {
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logger.Panicf("FATAL: %s: timestampsHeader.maxTimestamp=%d cannot be bigger than indexBlockHeader.maxTimestamp=%d", bsr.Path(), th.maxTimestamp, ih.minTimestamp)
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}
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// Read bsr.blockData
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bsr.a.reset()
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bsr.blockData.mustReadFrom(&bsr.a, bh, &bsr.streamReaders, bsr.ph.FormatVersion, bsr.columnNames)
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bsr.globalUncompressedSizeBytes += bh.uncompressedSizeBytes
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bsr.globalRowsCount += bh.rowsCount
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bsr.globalBlocksCount++
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if bsr.globalUncompressedSizeBytes > bsr.ph.UncompressedSizeBytes {
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logger.Panicf("FATAL: %s: too big size of entries read: %d; mustn't exceed partHeader.UncompressedSizeBytes=%d",
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bsr.Path(), bsr.globalUncompressedSizeBytes, bsr.ph.UncompressedSizeBytes)
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}
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if bsr.globalRowsCount > bsr.ph.RowsCount {
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logger.Panicf("FATAL: %s: too many log entries read so far: %d; mustn't exceed partHeader.RowsCount=%d", bsr.Path(), bsr.globalRowsCount, bsr.ph.RowsCount)
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}
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if bsr.globalBlocksCount > bsr.ph.BlocksCount {
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logger.Panicf("FATAL: %s: too many blocks read so far: %d; mustn't exceed partHeader.BlocksCount=%d", bsr.Path(), bsr.globalBlocksCount, bsr.ph.BlocksCount)
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}
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// The block has been sucessfully read
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bsr.nextBlockIdx++
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return true
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}
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func (bsr *blockStreamReader) nextIndexBlock() bool {
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// Advance to the next indexBlockHeader
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if bsr.nextIndexBlockIdx >= len(bsr.indexBlockHeaders) {
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// No more blocks left
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// Validate bsr.ph
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totalBytesRead := bsr.streamReaders.totalBytesRead()
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if bsr.ph.CompressedSizeBytes != totalBytesRead {
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logger.Panicf("FATAL: %s: partHeader.CompressedSizeBytes=%d must match the size of data read: %d", bsr.Path(), bsr.ph.CompressedSizeBytes, totalBytesRead)
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}
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if bsr.ph.UncompressedSizeBytes != bsr.globalUncompressedSizeBytes {
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logger.Panicf("FATAL: %s: partHeader.UncompressedSizeBytes=%d must match the size of entries read: %d",
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bsr.Path(), bsr.ph.UncompressedSizeBytes, bsr.globalUncompressedSizeBytes)
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}
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if bsr.ph.RowsCount != bsr.globalRowsCount {
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logger.Panicf("FATAL: %s: partHeader.RowsCount=%d must match the number of log entries read: %d", bsr.Path(), bsr.ph.RowsCount, bsr.globalRowsCount)
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}
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if bsr.ph.BlocksCount != bsr.globalBlocksCount {
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logger.Panicf("FATAL: %s: partHeader.BlocksCount=%d must match the number of blocks read: %d", bsr.Path(), bsr.ph.BlocksCount, bsr.globalBlocksCount)
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}
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return false
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}
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ih := &bsr.indexBlockHeaders[bsr.nextIndexBlockIdx]
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// Validate ih
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metaindexReader := &bsr.streamReaders.metaindexReader
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if ih.minTimestamp < bsr.ph.MinTimestamp {
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logger.Panicf("FATAL: %s: indexBlockHeader.minTimestamp=%d cannot be smaller than partHeader.MinTimestamp=%d",
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metaindexReader.Path(), ih.minTimestamp, bsr.ph.MinTimestamp)
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}
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if ih.maxTimestamp > bsr.ph.MaxTimestamp {
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logger.Panicf("FATAL: %s: indexBlockHeader.maxTimestamp=%d cannot be bigger than partHeader.MaxTimestamp=%d",
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metaindexReader.Path(), ih.maxTimestamp, bsr.ph.MaxTimestamp)
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}
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// Read indexBlock for the given ih
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bb := longTermBufPool.Get()
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bb.B = ih.mustReadNextIndexBlock(bb.B[:0], &bsr.streamReaders)
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bsr.blockHeaders = resetBlockHeaders(bsr.blockHeaders)
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var err error
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|
bsr.blockHeaders, err = unmarshalBlockHeaders(bsr.blockHeaders[:0], bb.B, bsr.ph.FormatVersion)
|
|
longTermBufPool.Put(bb)
|
|
if err != nil {
|
|
logger.Panicf("FATAL: %s: cannot unmarshal blockHeader entries: %s", bsr.streamReaders.indexReader.Path(), err)
|
|
}
|
|
|
|
bsr.nextIndexBlockIdx++
|
|
bsr.nextBlockIdx = 0
|
|
return true
|
|
}
|
|
|
|
// MustClose closes bsr.
|
|
func (bsr *blockStreamReader) MustClose() {
|
|
bsr.streamReaders.MustClose()
|
|
bsr.reset()
|
|
}
|
|
|
|
// getBlockStreamReader returns blockStreamReader.
|
|
//
|
|
// The returned blockStreamReader must be initialized with MustInit().
|
|
// call putBlockStreamReader() when the retruend blockStreamReader is no longer needed.
|
|
func getBlockStreamReader() *blockStreamReader {
|
|
v := blockStreamReaderPool.Get()
|
|
if v == nil {
|
|
v = &blockStreamReader{}
|
|
}
|
|
bsr := v.(*blockStreamReader)
|
|
return bsr
|
|
}
|
|
|
|
// putBlockStreamReader returns bsr to the pool.
|
|
//
|
|
// bsr cannot be used after returning to the pool.
|
|
func putBlockStreamReader(bsr *blockStreamReader) {
|
|
bsr.reset()
|
|
blockStreamReaderPool.Put(bsr)
|
|
}
|
|
|
|
var blockStreamReaderPool sync.Pool
|
|
|
|
// mustCloseBlockStreamReaders calls MustClose() on the given bsrs.
|
|
func mustCloseBlockStreamReaders(bsrs []*blockStreamReader) {
|
|
for _, bsr := range bsrs {
|
|
bsr.MustClose()
|
|
}
|
|
}
|