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Cache label name and last value when adding series (#8192)

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Signed-off-by: Chris Marchbanks <csmarchbanks@gmail.com>
This commit is contained in:
Chris Marchbanks 2020-11-19 11:18:12 -07:00 committed by GitHub
parent c2ce236de1
commit c8f810083d
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 35 additions and 14 deletions
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29
tsdb/index/index.go
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@ -103,6 +103,12 @@ func newCRC32() hash.Hash32 {
return crc32.New(castagnoliTable)
}
type symbolCacheEntry struct {
index uint32
lastValue string
lastValueIndex uint32
}
// Writer implements the IndexWriter interface for the standard
// serialization format.
type Writer struct {
@ -129,6 +135,7 @@ type Writer struct {
symbols *Symbols
symbolFile *fileutil.MmapFile
lastSymbol string
symbolCache map[string]symbolCacheEntry
labelIndexes []labelIndexHashEntry // Label index offsets.
labelNames map[string]uint64 // Label names, and their usage.
@ -224,6 +231,7 @@ func NewWriter(ctx context.Context, fn string) (*Writer, error) {
buf1: encoding.Encbuf{B: make([]byte, 0, 1<<22)},
buf2: encoding.Encbuf{B: make([]byte, 0, 1<<22)},
symbolCache: make(map[string]symbolCacheEntry, 1<<8),
labelNames: make(map[string]uint64, 1<<8),
crc32: newCRC32(),
}
@ -430,18 +438,31 @@ func (w *Writer) AddSeries(ref uint64, lset labels.Labels, chunks ...chunks.Meta
w.buf2.PutUvarint(len(lset))
for _, l := range lset {
index, err := w.symbols.ReverseLookup(l.Name)
var err error
cacheEntry, ok := w.symbolCache[l.Name]
nameIndex := cacheEntry.index
if !ok {
nameIndex, err = w.symbols.ReverseLookup(l.Name)
if err != nil {
return errors.Errorf("symbol entry for %q does not exist, %v", l.Name, err)
}
}
w.labelNames[l.Name]++
w.buf2.PutUvarint32(index)
w.buf2.PutUvarint32(nameIndex)
index, err = w.symbols.ReverseLookup(l.Value)
valueIndex := cacheEntry.lastValueIndex
if !ok || cacheEntry.lastValue != l.Value {
valueIndex, err = w.symbols.ReverseLookup(l.Value)
if err != nil {
return errors.Errorf("symbol entry for %q does not exist, %v", l.Value, err)
}
w.buf2.PutUvarint32(index)
w.symbolCache[l.Name] = symbolCacheEntry{
index: nameIndex,
lastValue: l.Value,
lastValueIndex: valueIndex,
}
}
w.buf2.PutUvarint32(valueIndex)
}
w.buf2.PutUvarint(len(chunks))