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block_stream_reader.go
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/
block_stream_reader.go
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package mergeset
import (
"fmt"
"io"
"path/filepath"
"sync"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/filestream"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fs"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
)
type blockStreamReader struct {
// Block contains the current block if Next returned true.
Block inmemoryBlock
blockItemIdx int
path string
// ph contains partHeader for the read part.
ph partHeader
// All the metaindexRows.
// The blockStreamReader doesn't own mrs - it must be alive
// during the read.
mrs []metaindexRow
// The index for the currently processed metaindexRow from mrs.
mrIdx int
// Currently processed blockHeaders.
bhs []blockHeader
// The index of the currently processed blockHeader.
bhIdx int
indexReader filestream.ReadCloser
itemsReader filestream.ReadCloser
lensReader filestream.ReadCloser
// Contains the current blockHeader.
bh *blockHeader
// Contains the current storageBlock.
sb storageBlock
// The number of items read so far.
itemsRead uint64
// The number of blocks read so far.
blocksRead uint64
// Whether the first item in the reader checked with ph.firstItem.
firstItemChecked bool
packedBuf []byte
unpackedBuf []byte
// The last error.
err error
}
func (bsr *blockStreamReader) reset() {
bsr.Block.Reset()
bsr.blockItemIdx = 0
bsr.path = ""
bsr.ph.Reset()
bsr.mrs = nil
bsr.mrIdx = 0
bsr.bhs = bsr.bhs[:0]
bsr.bhIdx = 0
bsr.indexReader = nil
bsr.itemsReader = nil
bsr.lensReader = nil
bsr.bh = nil
bsr.sb.Reset()
bsr.itemsRead = 0
bsr.blocksRead = 0
bsr.firstItemChecked = false
bsr.packedBuf = bsr.packedBuf[:0]
bsr.unpackedBuf = bsr.unpackedBuf[:0]
bsr.err = nil
}
func (bsr *blockStreamReader) String() string {
if len(bsr.path) > 0 {
return bsr.path
}
return bsr.ph.String()
}
// InitFromInmemoryPart initializes bsr from the given mp.
func (bsr *blockStreamReader) InitFromInmemoryPart(mp *inmemoryPart) {
bsr.reset()
var err error
bsr.mrs, err = unmarshalMetaindexRows(bsr.mrs[:0], mp.metaindexData.NewReader())
if err != nil {
logger.Panicf("BUG: cannot unmarshal metaindex rows from inmemory part: %s", err)
}
bsr.ph.CopyFrom(&mp.ph)
bsr.indexReader = mp.indexData.NewReader()
bsr.itemsReader = mp.itemsData.NewReader()
bsr.lensReader = mp.lensData.NewReader()
if bsr.ph.itemsCount <= 0 {
logger.Panicf("BUG: source inmemoryPart must contain at least a single item")
}
if bsr.ph.blocksCount <= 0 {
logger.Panicf("BUG: source inmemoryPart must contain at least a single block")
}
}
// InitFromFilePart initializes bsr from a file-based part on the given path.
//
// Part files are read without OS cache pollution, since the part is usually
// deleted after the merge.
func (bsr *blockStreamReader) InitFromFilePart(path string) error {
bsr.reset()
path = filepath.Clean(path)
if err := bsr.ph.ParseFromPath(path); err != nil {
return fmt.Errorf("cannot parse partHeader data from %q: %w", path, err)
}
metaindexPath := path + "/metaindex.bin"
metaindexFile, err := filestream.Open(metaindexPath, true)
if err != nil {
return fmt.Errorf("cannot open metaindex file in stream mode: %w", err)
}
bsr.mrs, err = unmarshalMetaindexRows(bsr.mrs[:0], metaindexFile)
metaindexFile.MustClose()
if err != nil {
return fmt.Errorf("cannot unmarshal metaindex rows from file %q: %w", metaindexPath, err)
}
indexPath := path + "/index.bin"
indexFile, err := filestream.Open(indexPath, true)
if err != nil {
return fmt.Errorf("cannot open index file in stream mode: %w", err)
}
itemsPath := path + "/items.bin"
itemsFile, err := filestream.Open(itemsPath, true)
if err != nil {
indexFile.MustClose()
return fmt.Errorf("cannot open items file in stream mode: %w", err)
}
lensPath := path + "/lens.bin"
lensFile, err := filestream.Open(lensPath, true)
if err != nil {
indexFile.MustClose()
itemsFile.MustClose()
return fmt.Errorf("cannot open lens file in stream mode: %w", err)
}
bsr.path = path
bsr.indexReader = indexFile
bsr.itemsReader = itemsFile
bsr.lensReader = lensFile
return nil
}
// MustClose closes the bsr.
//
// It closes *Reader files passed to Init.
func (bsr *blockStreamReader) MustClose() {
bsr.indexReader.MustClose()
bsr.itemsReader.MustClose()
bsr.lensReader.MustClose()
bsr.reset()
}
func (bsr *blockStreamReader) Next() bool {
if bsr.err != nil {
return false
}
if bsr.bhIdx >= len(bsr.bhs) {
// The current index block is over. Try reading the next index block.
if err := bsr.readNextBHS(); err != nil {
if err == io.EOF {
// Check the last item.
b := &bsr.Block
lastItem := b.items[len(b.items)-1].Bytes(b.data)
if string(bsr.ph.lastItem) != string(lastItem) {
err = fmt.Errorf("unexpected last item; got %X; want %X", lastItem, bsr.ph.lastItem)
}
} else {
err = fmt.Errorf("cannot read the next index block: %w", err)
}
bsr.err = err
return false
}
}
bsr.bh = &bsr.bhs[bsr.bhIdx]
bsr.bhIdx++
bsr.sb.itemsData = bytesutil.ResizeNoCopyMayOverallocate(bsr.sb.itemsData, int(bsr.bh.itemsBlockSize))
if err := fs.ReadFullData(bsr.itemsReader, bsr.sb.itemsData); err != nil {
bsr.err = fmt.Errorf("cannot read compressed items block with size %d: %w", bsr.bh.itemsBlockSize, err)
return false
}
bsr.sb.lensData = bytesutil.ResizeNoCopyMayOverallocate(bsr.sb.lensData, int(bsr.bh.lensBlockSize))
if err := fs.ReadFullData(bsr.lensReader, bsr.sb.lensData); err != nil {
bsr.err = fmt.Errorf("cannot read compressed lens block with size %d: %w", bsr.bh.lensBlockSize, err)
return false
}
if err := bsr.Block.UnmarshalData(&bsr.sb, bsr.bh.firstItem, bsr.bh.commonPrefix, bsr.bh.itemsCount, bsr.bh.marshalType); err != nil {
bsr.err = fmt.Errorf("cannot unmarshal inmemoryBlock from storageBlock with firstItem=%X, commonPrefix=%X, itemsCount=%d, marshalType=%d: %w",
bsr.bh.firstItem, bsr.bh.commonPrefix, bsr.bh.itemsCount, bsr.bh.marshalType, err)
return false
}
bsr.blocksRead++
if bsr.blocksRead > bsr.ph.blocksCount {
bsr.err = fmt.Errorf("too many blocks read: %d; must be smaller than partHeader.blocksCount %d", bsr.blocksRead, bsr.ph.blocksCount)
return false
}
bsr.blockItemIdx = 0
bsr.itemsRead += uint64(len(bsr.Block.items))
if bsr.itemsRead > bsr.ph.itemsCount {
bsr.err = fmt.Errorf("too many items read: %d; must be smaller than partHeader.itemsCount %d", bsr.itemsRead, bsr.ph.itemsCount)
return false
}
if !bsr.firstItemChecked {
bsr.firstItemChecked = true
b := &bsr.Block
firstItem := b.items[0].Bytes(b.data)
if string(bsr.ph.firstItem) != string(firstItem) {
bsr.err = fmt.Errorf("unexpected first item; got %X; want %X", firstItem, bsr.ph.firstItem)
return false
}
}
return true
}
func (bsr *blockStreamReader) readNextBHS() error {
if bsr.mrIdx >= len(bsr.mrs) {
return io.EOF
}
mr := &bsr.mrs[bsr.mrIdx]
bsr.mrIdx++
// Read compressed index block.
bsr.packedBuf = bytesutil.ResizeNoCopyMayOverallocate(bsr.packedBuf, int(mr.indexBlockSize))
if err := fs.ReadFullData(bsr.indexReader, bsr.packedBuf); err != nil {
return fmt.Errorf("cannot read compressed index block with size %d: %w", mr.indexBlockSize, err)
}
// Unpack the compressed index block.
var err error
bsr.unpackedBuf, err = encoding.DecompressZSTD(bsr.unpackedBuf[:0], bsr.packedBuf)
if err != nil {
return fmt.Errorf("cannot decompress index block: %w", err)
}
// Unmarshal the unpacked index block into bsr.bhs.
if n := int(mr.blockHeadersCount) - cap(bsr.bhs); n > 0 {
bsr.bhs = append(bsr.bhs[:cap(bsr.bhs)], make([]blockHeader, n)...)
}
bsr.bhs = bsr.bhs[:mr.blockHeadersCount]
bsr.bhIdx = 0
b := bsr.unpackedBuf
for i := 0; i < int(mr.blockHeadersCount); i++ {
tail, err := bsr.bhs[i].Unmarshal(b)
if err != nil {
return fmt.Errorf("cannot unmarshal blockHeader #%d in the index block #%d: %w", len(bsr.bhs), bsr.mrIdx, err)
}
b = tail
}
if len(b) > 0 {
return fmt.Errorf("unexpected non-empty tail left after unmarshaling block headers; len(tail)=%d", len(b))
}
return nil
}
func (bsr *blockStreamReader) Error() error {
if bsr.err == io.EOF {
return nil
}
return bsr.err
}
func getBlockStreamReader() *blockStreamReader {
v := bsrPool.Get()
if v == nil {
return &blockStreamReader{}
}
return v.(*blockStreamReader)
}
func putBlockStreamReader(bsr *blockStreamReader) {
bsr.MustClose()
bsrPool.Put(bsr)
}
var bsrPool sync.Pool