mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-01 14:47:38 +00:00
5b81bdde39
due to memory align the metaindexRow structure use 64-byte pre object. this commit changes the order of field, make metaindexRow use 56-byte pre object. Signed-off-by: Sasasu <su@sasasu.me>
166 lines
4.6 KiB
Go
166 lines
4.6 KiB
Go
package storage
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import (
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"fmt"
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"io"
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"io/ioutil"
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"sort"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding"
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)
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// metaindexRow is a single metaindex row.
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//
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// The row points to a single index block containing block headers.
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type metaindexRow struct {
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// TSID is the first TSID in the corresponding index block.
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TSID TSID
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// MinTimestamp is the minimum timestamp in the given index block.
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MinTimestamp int64
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// MaxTimestamp is the maximum timestamp in the given index block.
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MaxTimestamp int64
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// IndexBlockOffset is the offset of index block.
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IndexBlockOffset uint64
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// BlockHeadersCount is the number of block headers
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// in the given index block.
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BlockHeadersCount uint32
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// IndexBlockSize is the size of compressed index block.
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IndexBlockSize uint32
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}
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// Reset resets the mr using the given tsid.
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func (mr *metaindexRow) Reset() {
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mr.TSID = TSID{}
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mr.BlockHeadersCount = 0
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mr.MinTimestamp = (1 << 63) - 1
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mr.MaxTimestamp = -1 << 63
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mr.IndexBlockOffset = 0
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mr.IndexBlockSize = 0
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}
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// RegisterBlockHeader registers the given bh in the mr.
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func (mr *metaindexRow) RegisterBlockHeader(bh *blockHeader) {
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mr.BlockHeadersCount++
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if mr.BlockHeadersCount == 1 {
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mr.TSID = bh.TSID
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mr.MinTimestamp = bh.MinTimestamp
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mr.MaxTimestamp = bh.MaxTimestamp
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return
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}
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if bh.MinTimestamp < mr.MinTimestamp {
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mr.MinTimestamp = bh.MinTimestamp
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}
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if bh.MaxTimestamp > mr.MaxTimestamp {
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mr.MaxTimestamp = bh.MaxTimestamp
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}
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}
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// Marshal appends marshaled mr to dst and returns the result.
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func (mr *metaindexRow) Marshal(dst []byte) []byte {
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dst = mr.TSID.Marshal(dst)
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dst = encoding.MarshalUint32(dst, mr.BlockHeadersCount)
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dst = encoding.MarshalInt64(dst, mr.MinTimestamp)
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dst = encoding.MarshalInt64(dst, mr.MaxTimestamp)
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dst = encoding.MarshalUint64(dst, mr.IndexBlockOffset)
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dst = encoding.MarshalUint32(dst, mr.IndexBlockSize)
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return dst
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}
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// Unmarshal unmarshals mr from src and returns the tail of src.
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func (mr *metaindexRow) Unmarshal(src []byte) ([]byte, error) {
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// Unmarshal TSID
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tail, err := mr.TSID.Unmarshal(src)
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if err != nil {
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return src, fmt.Errorf("cannot unmarshal TSID: %w", err)
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}
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src = tail
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// Unmarshal BlockHeadersCount
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if len(src) < 4 {
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return src, fmt.Errorf("cannot unmarshal BlockHeadersCount from %d bytes; want at least %d bytes", len(src), 4)
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}
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mr.BlockHeadersCount = encoding.UnmarshalUint32(src)
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src = src[4:]
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// Unmarshal MinTimestamp
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if len(src) < 8 {
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return src, fmt.Errorf("cannot unmarshal MinTimestamp from %d bytes; want at least %d bytes", len(src), 8)
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}
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mr.MinTimestamp = encoding.UnmarshalInt64(src)
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src = src[8:]
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// Unmarshal MaxTimestamp
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if len(src) < 8 {
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return src, fmt.Errorf("cannot unmarshal MaxTimestamp from %d bytes; want at least %d bytes", len(src), 8)
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}
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mr.MaxTimestamp = encoding.UnmarshalInt64(src)
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src = src[8:]
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// Unmarshal IndexBlockOffset
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if len(src) < 8 {
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return src, fmt.Errorf("cannot unmarshal IndexBlockOffset from %d bytes; want at least %d bytes", len(src), 8)
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}
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mr.IndexBlockOffset = encoding.UnmarshalUint64(src)
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src = src[8:]
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// Unmarshal IndexBlockSize
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if len(src) < 4 {
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return src, fmt.Errorf("cannot unmarshal IndexBlockSize from %d bytes; want at least %d bytes", len(src), 4)
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}
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mr.IndexBlockSize = encoding.UnmarshalUint32(src)
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src = src[4:]
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// Validate unmarshaled data.
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if mr.BlockHeadersCount <= 0 {
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return src, fmt.Errorf("BlockHeadersCount must be greater than 0")
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}
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if mr.IndexBlockSize > 2*8*maxBlockSize {
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return src, fmt.Errorf("too big IndexBlockSize; got %d; cannot exceed %d", mr.IndexBlockSize, 2*8*maxBlockSize)
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}
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return src, nil
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}
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func unmarshalMetaindexRows(dst []metaindexRow, r io.Reader) ([]metaindexRow, error) {
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compressedData, err := ioutil.ReadAll(r)
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if err != nil {
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return dst, fmt.Errorf("cannot read metaindex rows: %w", err)
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}
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data, err := encoding.DecompressZSTD(nil, compressedData)
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if err != nil {
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return dst, fmt.Errorf("cannot decompress metaindex rows: %w", err)
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}
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dstLen := len(dst)
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for len(data) > 0 {
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if len(dst) < cap(dst) {
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dst = dst[:len(dst)+1]
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} else {
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dst = append(dst, metaindexRow{})
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}
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mr := &dst[len(dst)-1]
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tail, err := mr.Unmarshal(data)
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if err != nil {
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return dst, fmt.Errorf("cannot unmarshal metaindexRow #%d from metaindex data: %w", len(dst)-dstLen, err)
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}
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data = tail
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}
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if dstLen == len(dst) {
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return dst, fmt.Errorf("expecting non-zero metaindex rows; got zero")
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}
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// Make sure metaindex rows are sorted by tsid
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tmp := dst[dstLen:]
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ok := sort.SliceIsSorted(tmp, func(i, j int) bool { return tmp[i].TSID.Less(&tmp[j].TSID) })
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if !ok {
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return dst, fmt.Errorf("metaindexRow values must be sorted by TSID; got %+v", tmp)
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}
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return dst, nil
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}
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