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block_stream_reader.go
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block_stream_reader.go
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package logstorage
import (
"path/filepath"
"sync"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/filestream"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
)
type readerWithStats struct {
r filestream.ReadCloser
bytesRead uint64
}
func (r *readerWithStats) reset() {
r.r = nil
r.bytesRead = 0
}
func (r *readerWithStats) init(rc filestream.ReadCloser) {
r.reset()
r.r = rc
}
// Path returns the path to r file
func (r *readerWithStats) Path() string {
return r.r.Path()
}
// MustReadFull reads len(data) to r.
func (r *readerWithStats) MustReadFull(data []byte) {
fs.MustReadData(r.r, data)
r.bytesRead += uint64(len(data))
}
func (r *readerWithStats) Read(p []byte) (int, error) {
n, err := r.r.Read(p)
r.bytesRead += uint64(n)
return n, err
}
func (r *readerWithStats) MustClose() {
r.r.MustClose()
r.r = nil
}
// streamReaders contains readers for blockStreamReader
type streamReaders struct {
metaindexReader readerWithStats
indexReader readerWithStats
columnsHeaderReader readerWithStats
timestampsReader readerWithStats
fieldValuesReader readerWithStats
fieldBloomFilterReader readerWithStats
messageValuesReader readerWithStats
messageBloomFilterReader readerWithStats
}
func (sr *streamReaders) reset() {
sr.metaindexReader.reset()
sr.indexReader.reset()
sr.columnsHeaderReader.reset()
sr.timestampsReader.reset()
sr.fieldValuesReader.reset()
sr.fieldBloomFilterReader.reset()
sr.messageValuesReader.reset()
sr.messageBloomFilterReader.reset()
}
func (sr *streamReaders) init(metaindexReader, indexReader, columnsHeaderReader, timestampsReader, fieldValuesReader, fieldBloomFilterReader,
messageValuesReader, messageBloomFilterReader filestream.ReadCloser,
) {
sr.metaindexReader.init(metaindexReader)
sr.indexReader.init(indexReader)
sr.columnsHeaderReader.init(columnsHeaderReader)
sr.timestampsReader.init(timestampsReader)
sr.fieldValuesReader.init(fieldValuesReader)
sr.fieldBloomFilterReader.init(fieldBloomFilterReader)
sr.messageValuesReader.init(messageValuesReader)
sr.messageBloomFilterReader.init(messageBloomFilterReader)
}
func (sr *streamReaders) totalBytesRead() uint64 {
n := uint64(0)
n += sr.metaindexReader.bytesRead
n += sr.indexReader.bytesRead
n += sr.columnsHeaderReader.bytesRead
n += sr.timestampsReader.bytesRead
n += sr.fieldValuesReader.bytesRead
n += sr.fieldBloomFilterReader.bytesRead
n += sr.messageValuesReader.bytesRead
n += sr.messageBloomFilterReader.bytesRead
return n
}
func (sr *streamReaders) MustClose() {
sr.metaindexReader.MustClose()
sr.indexReader.MustClose()
sr.columnsHeaderReader.MustClose()
sr.timestampsReader.MustClose()
sr.fieldValuesReader.MustClose()
sr.fieldBloomFilterReader.MustClose()
sr.messageValuesReader.MustClose()
sr.messageBloomFilterReader.MustClose()
}
// blockStreamReader is used for reading blocks in streaming manner from a part.
type blockStreamReader struct {
// blockData contains the data for the last read block
blockData blockData
// ph is the header for the part
ph partHeader
// streamReaders contains data readers in stream mode
streamReaders streamReaders
// indexBlockHeaders contains the list of all the indexBlockHeader entries for the part
indexBlockHeaders []indexBlockHeader
// blockHeaders contains the list of blockHeader entries for the current indexBlockHeader pointed by nextIndexBlockIdx
blockHeaders []blockHeader
// nextIndexBlockIdx is the index of the next item to read from indexBlockHeaders
nextIndexBlockIdx int
// nextBlockIdx is the index of the next item to read from blockHeaders
nextBlockIdx int
// globalUncompressedSizeBytes is the total size of log entries seen in the part
globalUncompressedSizeBytes uint64
// globalRowsCount is the number of log entries seen in the part
globalRowsCount uint64
// globalBlocksCount is the number of blocks seen in the part
globalBlocksCount uint64
// sidLast is the stream id for the previously read block
sidLast streamID
// minTimestampLast is the minimum timestamp for the previously read block
minTimestampLast int64
}
// reset resets bsr, so it can be re-used
func (bsr *blockStreamReader) reset() {
bsr.blockData.reset()
bsr.ph.reset()
bsr.streamReaders.reset()
ihs := bsr.indexBlockHeaders
if len(ihs) > 10e3 {
// The ihs len is unbound, so it is better to drop too long indexBlockHeaders in order to reduce memory usage
ihs = nil
}
for i := range ihs {
ihs[i].reset()
}
bsr.indexBlockHeaders = ihs[:0]
bhs := bsr.blockHeaders
for i := range bhs {
bhs[i].reset()
}
bsr.blockHeaders = bhs[:0]
bsr.nextIndexBlockIdx = 0
bsr.nextBlockIdx = 0
bsr.globalUncompressedSizeBytes = 0
bsr.globalRowsCount = 0
bsr.globalBlocksCount = 0
bsr.sidLast.reset()
bsr.minTimestampLast = 0
}
// Path returns part path for bsr (e.g. file path, url or in-memory reference)
func (bsr *blockStreamReader) Path() string {
path := bsr.streamReaders.metaindexReader.Path()
return filepath.Dir(path)
}
// MustInitFromInmemoryPart initializes bsr from mp.
func (bsr *blockStreamReader) MustInitFromInmemoryPart(mp *inmemoryPart) {
bsr.reset()
bsr.ph = mp.ph
// Initialize streamReaders
metaindexReader := mp.metaindex.NewReader()
indexReader := mp.index.NewReader()
columnsHeaderReader := mp.columnsHeader.NewReader()
timestampsReader := mp.timestamps.NewReader()
fieldValuesReader := mp.fieldValues.NewReader()
fieldBloomFilterReader := mp.fieldBloomFilter.NewReader()
messageValuesReader := mp.messageValues.NewReader()
messageBloomFilterReader := mp.messageBloomFilter.NewReader()
bsr.streamReaders.init(metaindexReader, indexReader, columnsHeaderReader, timestampsReader,
fieldValuesReader, fieldBloomFilterReader, messageValuesReader, messageBloomFilterReader)
// Read metaindex data
bsr.indexBlockHeaders = mustReadIndexBlockHeaders(bsr.indexBlockHeaders[:0], &bsr.streamReaders.metaindexReader)
}
// MustInitFromFilePart initializes bsr from file part at the given path.
func (bsr *blockStreamReader) MustInitFromFilePart(path string) {
bsr.reset()
// Files in the part are always read without OS cache pollution,
// since they are usually deleted after the merge.
const nocache = true
metaindexPath := filepath.Join(path, metaindexFilename)
indexPath := filepath.Join(path, indexFilename)
columnsHeaderPath := filepath.Join(path, columnsHeaderFilename)
timestampsPath := filepath.Join(path, timestampsFilename)
fieldValuesPath := filepath.Join(path, fieldValuesFilename)
fieldBloomFilterPath := filepath.Join(path, fieldBloomFilename)
messageValuesPath := filepath.Join(path, messageValuesFilename)
messageBloomFilterPath := filepath.Join(path, messageBloomFilename)
bsr.ph.mustReadMetadata(path)
// Open data readers
metaindexReader := filestream.MustOpen(metaindexPath, nocache)
indexReader := filestream.MustOpen(indexPath, nocache)
columnsHeaderReader := filestream.MustOpen(columnsHeaderPath, nocache)
timestampsReader := filestream.MustOpen(timestampsPath, nocache)
fieldValuesReader := filestream.MustOpen(fieldValuesPath, nocache)
fieldBloomFilterReader := filestream.MustOpen(fieldBloomFilterPath, nocache)
messageValuesReader := filestream.MustOpen(messageValuesPath, nocache)
messageBloomFilterReader := filestream.MustOpen(messageBloomFilterPath, nocache)
// Initialize streamReaders
bsr.streamReaders.init(metaindexReader, indexReader, columnsHeaderReader, timestampsReader,
fieldValuesReader, fieldBloomFilterReader, messageValuesReader, messageBloomFilterReader)
// Read metaindex data
bsr.indexBlockHeaders = mustReadIndexBlockHeaders(bsr.indexBlockHeaders[:0], &bsr.streamReaders.metaindexReader)
}
// NextBlock reads the next block from bsr and puts it into bsr.blockData.
//
// false is returned if there are no other blocks.
func (bsr *blockStreamReader) NextBlock() bool {
for bsr.nextBlockIdx >= len(bsr.blockHeaders) {
if !bsr.nextIndexBlock() {
return false
}
}
ih := &bsr.indexBlockHeaders[bsr.nextIndexBlockIdx-1]
bh := &bsr.blockHeaders[bsr.nextBlockIdx]
th := &bh.timestampsHeader
// Validate bh
if bh.streamID.less(&bsr.sidLast) {
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)
}
if bh.streamID.equal(&bsr.sidLast) && th.minTimestamp < bsr.minTimestampLast {
logger.Panicf("FATAL: %s: timestamps.minTimestamp=%d cannot be smaller than the minTimestamp for the previously read block for the same streamID: %d",
bsr.Path(), th.minTimestamp, bsr.minTimestampLast)
}
bsr.minTimestampLast = th.minTimestamp
bsr.sidLast = bh.streamID
if th.minTimestamp < ih.minTimestamp {
logger.Panicf("FATAL: %s: timestampsHeader.minTimestamp=%d cannot be smaller than indexBlockHeader.minTimestamp=%d", bsr.Path(), th.minTimestamp, ih.minTimestamp)
}
if th.maxTimestamp > ih.maxTimestamp {
logger.Panicf("FATAL: %s: timestampsHeader.maxTimestamp=%d cannot be bigger than indexBlockHeader.maxTimestamp=%d", bsr.Path(), th.maxTimestamp, ih.minTimestamp)
}
// Read bsr.blockData
bsr.blockData.mustReadFrom(bh, &bsr.streamReaders)
bsr.globalUncompressedSizeBytes += bh.uncompressedSizeBytes
bsr.globalRowsCount += bh.rowsCount
bsr.globalBlocksCount++
if bsr.globalUncompressedSizeBytes > bsr.ph.UncompressedSizeBytes {
logger.Panicf("FATAL: %s: too big size of entries read: %d; mustn't exceed partHeader.UncompressedSizeBytes=%d",
bsr.Path(), bsr.globalUncompressedSizeBytes, bsr.ph.UncompressedSizeBytes)
}
if bsr.globalRowsCount > bsr.ph.RowsCount {
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)
}
if bsr.globalBlocksCount > bsr.ph.BlocksCount {
logger.Panicf("FATAL: %s: too many blocks read so far: %d; mustn't exceed partHeader.BlocksCount=%d", bsr.Path(), bsr.globalBlocksCount, bsr.ph.BlocksCount)
}
// The block has been sucessfully read
bsr.nextBlockIdx++
return true
}
func (bsr *blockStreamReader) nextIndexBlock() bool {
// Advance to the next indexBlockHeader
if bsr.nextIndexBlockIdx >= len(bsr.indexBlockHeaders) {
// No more blocks left
// Validate bsr.ph
totalBytesRead := bsr.streamReaders.totalBytesRead()
if bsr.ph.CompressedSizeBytes != totalBytesRead {
logger.Panicf("FATAL: %s: partHeader.CompressedSizeBytes=%d must match the size of data read: %d", bsr.Path(), bsr.ph.CompressedSizeBytes, totalBytesRead)
}
if bsr.ph.UncompressedSizeBytes != bsr.globalUncompressedSizeBytes {
logger.Panicf("FATAL: %s: partHeader.UncompressedSizeBytes=%d must match the size of entries read: %d",
bsr.Path(), bsr.ph.UncompressedSizeBytes, bsr.globalUncompressedSizeBytes)
}
if bsr.ph.RowsCount != bsr.globalRowsCount {
logger.Panicf("FATAL: %s: partHeader.RowsCount=%d must match the number of log entries read: %d", bsr.Path(), bsr.ph.RowsCount, bsr.globalRowsCount)
}
if bsr.ph.BlocksCount != bsr.globalBlocksCount {
logger.Panicf("FATAL: %s: partHeader.BlocksCount=%d must match the number of blocks read: %d", bsr.Path(), bsr.ph.BlocksCount, bsr.globalBlocksCount)
}
return false
}
ih := &bsr.indexBlockHeaders[bsr.nextIndexBlockIdx]
// Validate ih
metaindexReader := &bsr.streamReaders.metaindexReader
if ih.minTimestamp < bsr.ph.MinTimestamp {
logger.Panicf("FATAL: %s: indexBlockHeader.minTimestamp=%d cannot be smaller than partHeader.MinTimestamp=%d",
metaindexReader.Path(), ih.minTimestamp, bsr.ph.MinTimestamp)
}
if ih.maxTimestamp > bsr.ph.MaxTimestamp {
logger.Panicf("FATAL: %s: indexBlockHeader.maxTimestamp=%d cannot be bigger than partHeader.MaxTimestamp=%d",
metaindexReader.Path(), ih.maxTimestamp, bsr.ph.MaxTimestamp)
}
// Read indexBlock for the given ih
bb := longTermBufPool.Get()
bb.B = ih.mustReadNextIndexBlock(bb.B[:0], &bsr.streamReaders)
bsr.blockHeaders = resetBlockHeaders(bsr.blockHeaders)
var err error
bsr.blockHeaders, err = unmarshalBlockHeaders(bsr.blockHeaders[:0], bb.B)
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()
}
}