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Write label indices based on the posting offset table.

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This avoids having to build it up in RAM, and means that all variable
memory usage for compactions is now 0.25 bytes per symbol plus a few
O(labelnames) structures. So in practice, pretty close to constant
memory for compactions.

benchmark                                                                                   old ns/op       new ns/op       delta
BenchmarkCompaction/type=normal,blocks=4,series=10000,samplesPerSeriesPerBlock=101-4        662974828       667162981       +0.63%
BenchmarkCompaction/type=normal,blocks=4,series=10000,samplesPerSeriesPerBlock=1001-4       2459590377      2131168138      -13.35%
BenchmarkCompaction/type=normal,blocks=4,series=10000,samplesPerSeriesPerBlock=2001-4       3808280548      3919290378      +2.91%
BenchmarkCompaction/type=normal,blocks=4,series=10000,samplesPerSeriesPerBlock=5001-4       8513884311      8738099339      +2.63%
BenchmarkCompaction/type=vertical,blocks=4,series=10000,samplesPerSeriesPerBlock=101-4      1898843003      1944131966      +2.39%
BenchmarkCompaction/type=vertical,blocks=4,series=10000,samplesPerSeriesPerBlock=1001-4     5601478437      6031391658      +7.67%
BenchmarkCompaction/type=vertical,blocks=4,series=10000,samplesPerSeriesPerBlock=2001-4     11225096097     11359624463     +1.20%
BenchmarkCompaction/type=vertical,blocks=4,series=10000,samplesPerSeriesPerBlock=5001-4     23994637282     23919583343     -0.31%
BenchmarkCompactionFromHead/labelnames=1,labelvalues=100000-4                               891042098       826898358       -7.20%
BenchmarkCompactionFromHead/labelnames=10,labelvalues=10000-4                               915949138       902555676       -1.46%
BenchmarkCompactionFromHead/labelnames=100,labelvalues=1000-4                               955138431       879067946       -7.96%
BenchmarkCompactionFromHead/labelnames=1000,labelvalues=100-4                               991447640       958785968       -3.29%
BenchmarkCompactionFromHead/labelnames=10000,labelvalues=10-4                               1068729356      980249080       -8.28%

benchmark                                                                                   old allocs     new allocs     delta
BenchmarkCompaction/type=normal,blocks=4,series=10000,samplesPerSeriesPerBlock=101-4        470778         470556         -0.05%
BenchmarkCompaction/type=normal,blocks=4,series=10000,samplesPerSeriesPerBlock=1001-4       791429         791225         -0.03%
BenchmarkCompaction/type=normal,blocks=4,series=10000,samplesPerSeriesPerBlock=2001-4       1111514        1111257        -0.02%
BenchmarkCompaction/type=normal,blocks=4,series=10000,samplesPerSeriesPerBlock=5001-4       2111498        2111369        -0.01%
BenchmarkCompaction/type=vertical,blocks=4,series=10000,samplesPerSeriesPerBlock=101-4      841433         841220         -0.03%
BenchmarkCompaction/type=vertical,blocks=4,series=10000,samplesPerSeriesPerBlock=1001-4     1911469        1911202        -0.01%
BenchmarkCompaction/type=vertical,blocks=4,series=10000,samplesPerSeriesPerBlock=2001-4     3041558        3041328        -0.01%
BenchmarkCompaction/type=vertical,blocks=4,series=10000,samplesPerSeriesPerBlock=5001-4     6741534        6741382        -0.00%
BenchmarkCompactionFromHead/labelnames=1,labelvalues=100000-4                               824856         820873         -0.48%
BenchmarkCompactionFromHead/labelnames=10,labelvalues=10000-4                               887220         885180         -0.23%
BenchmarkCompactionFromHead/labelnames=100,labelvalues=1000-4                               905253         901539         -0.41%
BenchmarkCompactionFromHead/labelnames=1000,labelvalues=100-4                               925148         913632         -1.24%
BenchmarkCompactionFromHead/labelnames=10000,labelvalues=10-4                               1019141        978727         -3.97%

benchmark                                                                                   old bytes      new bytes      delta
BenchmarkCompaction/type=normal,blocks=4,series=10000,samplesPerSeriesPerBlock=101-4        35694744       41523836       +16.33%
BenchmarkCompaction/type=normal,blocks=4,series=10000,samplesPerSeriesPerBlock=1001-4       53405264       59499056       +11.41%
BenchmarkCompaction/type=normal,blocks=4,series=10000,samplesPerSeriesPerBlock=2001-4       74160320       78151568       +5.38%
BenchmarkCompaction/type=normal,blocks=4,series=10000,samplesPerSeriesPerBlock=5001-4       120878480      135364672      +11.98%
BenchmarkCompaction/type=vertical,blocks=4,series=10000,samplesPerSeriesPerBlock=101-4      203832448      209925504      +2.99%
BenchmarkCompaction/type=vertical,blocks=4,series=10000,samplesPerSeriesPerBlock=1001-4     341029208      346551064      +1.62%
BenchmarkCompaction/type=vertical,blocks=4,series=10000,samplesPerSeriesPerBlock=2001-4     580217176      582345224      +0.37%
BenchmarkCompaction/type=vertical,blocks=4,series=10000,samplesPerSeriesPerBlock=5001-4     1356872288     1363495368     +0.49%
BenchmarkCompactionFromHead/labelnames=1,labelvalues=100000-4                               119535672      94815920       -20.68%
BenchmarkCompactionFromHead/labelnames=10,labelvalues=10000-4                               115352280      95980776       -16.79%
BenchmarkCompactionFromHead/labelnames=100,labelvalues=1000-4                               119472320      98724460       -17.37%
BenchmarkCompactionFromHead/labelnames=1000,labelvalues=100-4                               111979312      94325456       -15.77%
BenchmarkCompactionFromHead/labelnames=10000,labelvalues=10-4                               116628584      98566344       -15.49%

Signed-off-by: Brian Brazil <brian.brazil@robustperception.io>
This commit is contained in:
Brian Brazil 2019-12-18 01:29:41 +00:00
parent 7d1aad46b8
commit 2b653ee230
1 changed files with 62 additions and 34 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

84
tsdb/index/index.go
View file

@ -15,6 +15,7 @@ package index
import (
"bufio"
"bytes"
"context"
"encoding/binary"
"hash"
@ -118,6 +119,7 @@ type Writer struct {
toc TOC
stage indexWriterStage
postingsStart uint64 // Due to padding, can differ from TOC entry.
// Reusable memory.
buf1 encoding.Encbuf
@ -129,7 +131,6 @@ type Writer struct {
lastSymbol string
labelIndexes []labelIndexHashEntry // Label index offsets.
labelValues map[string]map[uint32]struct{} // Label names, and their values's symbol indexes.
labelNames map[string]uint64 // Label names, and their usage.
// Hold last series to validate that clients insert new series in order.
@ -224,7 +225,6 @@ func NewWriter(ctx context.Context, fn string) (*Writer, error) {
buf2: encoding.Encbuf{B: make([]byte, 0, 1<<22)},
labelNames: make(map[string]uint64, 1<<8),
labelValues: make(map[string]map[uint32]struct{}, 1<<8),
crc32: newCRC32(),
}
if err := iw.writeMeta(); err != nil {
@ -277,7 +277,7 @@ func (fw *fileWriter) write(bufs ...[]byte) error {
// Once we move to compressed/varint representations in those areas, this limitation
// can be lifted.
if fw.pos > 16*math.MaxUint32 {
return errors.Errorf("exceeding max size of 64GiB")
return errors.Errorf("%q exceeding max size of 64GiB", fw.name)
}
}
return nil
@ -331,9 +331,11 @@ func (w *Writer) ensureStage(s indexWriterStage) error {
if w.stage == s {
return nil
}
if w.stage+1 < s {
if w.stage < s-1 {
// A stage has been skipped.
w.ensureStage(s - 1)
if err := w.ensureStage(s - 1); err != nil {
return err
}
}
if w.stage > s {
return errors.Errorf("invalid stage %q, currently at %q", s, w.stage)
@ -420,7 +422,6 @@ func (w *Writer) AddSeries(ref uint64, lset labels.Labels, chunks ...chunks.Meta
w.buf2.PutUvarint(len(lset))
for _, l := range lset {
// here we have an index for the symbol file if v2, otherwise it's an offset
index, err := w.symbols.ReverseLookup(l.Name)
if err != nil {
return errors.Errorf("symbol entry for %q does not exist, %v", l.Name, err)
@ -433,11 +434,6 @@ func (w *Writer) AddSeries(ref uint64, lset labels.Labels, chunks ...chunks.Meta
return errors.Errorf("symbol entry for %q does not exist, %v", l.Value, err)
}
w.buf2.PutUvarint32(index)
if _, ok := w.labelValues[l.Name]; !ok {
w.labelValues[l.Name] = map[uint32]struct{}{}
}
w.labelValues[l.Name][index] = struct{}{}
}
w.buf2.PutUvarint(len(chunks))
@ -536,19 +532,52 @@ func (w *Writer) finishSymbols() error {
}
func (w *Writer) writeLabelIndices() error {
names := make([]string, 0, len(w.labelValues))
for n := range w.labelValues {
names = append(names, n)
if err := w.fPO.flush(); err != nil {
return err
}
sort.Strings(names)
for _, n := range names {
values := make([]uint32, 0, len(w.labelValues[n]))
for v := range w.labelValues[n] {
values = append(values, v)
// Find all the label values in the tmp posting offset table.
f, err := fileutil.OpenMmapFile(w.fPO.name)
if err != nil {
return err
}
sort.Sort(uint32slice(values))
if err := w.writeLabelIndex(n, values); err != nil {
defer f.Close()
d := encoding.NewDecbufRaw(realByteSlice(f.Bytes()), int(w.fPO.pos))
cnt := w.cntPO
current := []byte{}
values := []uint32{}
for d.Err() == nil && cnt > 0 {
cnt--
d.Uvarint() // Keycount.
name := d.UvarintBytes() // Label name.
value := yoloString(d.UvarintBytes()) // Label value.
d.Uvarint64() // Offset.
if len(name) == 0 {
continue // All index is ignored.
}
if !bytes.Equal(name, current) && len(values) > 0 {
// We've reached a new label name.
if err := w.writeLabelIndex(string(current), values); err != nil {
return err
}
values = values[:0]
}
current = name
sid, err := w.symbols.ReverseLookup(value)
if err != nil {
return err
}
values = append(values, sid)
}
if d.Err() != nil {
return d.Err()
}
// Handle the last label.
if len(values) > 0 {
if err := w.writeLabelIndex(string(current), values); err != nil {
return err
}
}
@ -657,7 +686,7 @@ func (w *Writer) writePostingsOffsetTable() error {
// Copy over the tmp posting offset table, however we need to
// adjust the offsets.
adjustment := w.toc.Postings
adjustment := w.postingsStart
w.buf1.Reset()
w.crc32.Reset()
@ -888,10 +917,11 @@ func (w *Writer) writePosting(name, value string, offs []uint32) error {
}
func (w *Writer) writePostings() error {
// There's padding in the tmp filem make sure it actually works.
// There's padding in the tmp file, make sure it actually works.
if err := w.f.addPadding(4); err != nil {
return err
}
w.postingsStart = w.f.pos
// Copy temporary file into main index.
if err := w.fP.flush(); err != nil {
@ -910,6 +940,9 @@ func (w *Writer) writePostings() error {
}
w.f.pos += uint64(n)
if err := w.fP.close(); err != nil {
return err
}
if err := w.fP.remove(); err != nil {
return err
}
@ -928,11 +961,6 @@ type labelIndexHashEntry struct {
offset uint64
}
type postingsHashEntry struct {
name, value string
offset uint64
}
func (w *Writer) Close() error {
if err := w.ensureStage(idxStageDone); err != nil {
return err