forked from cortexproject/cortex
/
tsdb.go
366 lines (296 loc) · 9.31 KB
/
tsdb.go
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package builder
import (
"context"
"crypto/rand"
"io"
"os"
"path/filepath"
"sync"
"time"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/oklog/ulid"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/tsdb"
"github.com/prometheus/prometheus/tsdb/chunkenc"
"github.com/prometheus/prometheus/tsdb/chunks"
"github.com/prometheus/prometheus/tsdb/index"
"github.com/thanos-io/thanos/pkg/block"
"github.com/thanos-io/thanos/pkg/block/metadata"
"github.com/cortexproject/cortex/pkg/chunk"
"github.com/cortexproject/cortex/pkg/querier/iterators"
)
const unsortedChunksDir = "unsorted_chunks"
// This builder uses TSDB's chunk and index writer directly, without
// using TSDB Head.
type tsdbBuilder struct {
log log.Logger
ulid ulid.ULID
outDir string
tmpBlockDir string
unsortedChunksWriterMu sync.Mutex
unsortedChunksWriter tsdb.ChunkWriter
startTime model.Time
endTime model.Time
series *seriesList
seriesDir string
writtenSamples prometheus.Counter
processedSeries prometheus.Counter
seriesInMemory prometheus.Gauge
}
func newTsdbBuilder(outDir string, start, end time.Time, seriesBatchLimit int, log log.Logger, processedSeries, writtenSamples prometheus.Counter, seriesInMemory prometheus.Gauge) (*tsdbBuilder, error) {
id, err := ulid.New(ulid.Now(), rand.Reader)
if err != nil {
return nil, errors.Wrap(err, "create ULID")
}
blockDir := filepath.Join(outDir, id.String()+".tmp")
seriesDir := filepath.Join(blockDir, "series")
err = os.RemoveAll(blockDir)
if err != nil {
return nil, err
}
// Also makes blockDir, if missing
err = os.MkdirAll(seriesDir, 0777)
if err != nil {
return nil, err
}
unsortedChunksWriter, err := chunks.NewWriter(filepath.Join(blockDir, unsortedChunksDir))
if err != nil {
return nil, errors.Wrap(err, "chunks writer")
}
return &tsdbBuilder{
log: log,
ulid: id,
outDir: outDir,
tmpBlockDir: blockDir,
unsortedChunksWriter: unsortedChunksWriter,
startTime: model.TimeFromUnixNano(start.UnixNano()),
endTime: model.TimeFromUnixNano(end.UnixNano()),
series: newSeriesList(seriesBatchLimit, seriesDir),
seriesDir: seriesDir,
processedSeries: processedSeries,
writtenSamples: writtenSamples,
seriesInMemory: seriesInMemory,
}, err
}
// Called concurrently with all chunks required to build a single series.
func (d *tsdbBuilder) buildSingleSeries(metric labels.Labels, cs []chunk.Chunk) error {
defer d.processedSeries.Inc()
// Used by Prometheus, in head.go (with a reference to Gorilla paper).
const samplesPerChunk = 120
chs := make([]chunks.Meta, 0, 25) // On average, single series seem to have around 25 chunks.
seriesSamples := uint64(0)
// current chunk and appender. If nil, new chunk will be created.
var (
ch *chunks.Meta
app chunkenc.Appender
err error
)
// This will merge and deduplicate samples from chunks.
it := iterators.NewChunkMergeIterator(cs, d.startTime, d.endTime)
for it.Next() && it.Err() == nil {
t, v := it.At()
mt := model.Time(t)
if mt < d.startTime {
continue
}
if mt >= d.endTime {
break
}
if ch == nil {
chs = append(chs, chunks.Meta{})
ch = &chs[len(chs)-1]
ch.MinTime = t
ch.Chunk = chunkenc.NewXORChunk()
app, err = ch.Chunk.Appender()
if err != nil {
return err
}
}
ch.MaxTime = t
app.Append(t, v)
seriesSamples++
if ch.Chunk.NumSamples() == samplesPerChunk {
ch.Chunk.Compact()
ch = nil
}
}
if ch != nil {
ch.Chunk.Compact()
ch = nil
}
d.unsortedChunksWriterMu.Lock()
err = d.unsortedChunksWriter.WriteChunks(chs...)
d.unsortedChunksWriterMu.Unlock()
if err != nil {
return err
}
// Remove chunks data from memory, but keep reference.
for ix := range chs {
if chs[ix].Ref == 0 {
return errors.Errorf("chunk ref not set")
}
chs[ix].Chunk = nil
}
// No samples, ignore.
if len(chs) == 0 {
return nil
}
minTime := chs[0].MinTime
maxTime := chs[len(chs)-1].MaxTime
err = d.series.addSeries(metric, chs, seriesSamples, minTime, maxTime)
d.seriesInMemory.Set(float64(d.series.unflushedSeries()))
d.writtenSamples.Add(float64(seriesSamples))
return err
}
func (d *tsdbBuilder) finishBlock(source string, labels map[string]string) (ulid.ULID, error) {
if err := d.unsortedChunksWriter.Close(); err != nil {
return ulid.ULID{}, errors.Wrap(err, "closing chunks writer")
}
if err := d.series.flushSeries(); err != nil {
return ulid.ULID{}, errors.Wrap(err, "flushing series")
}
d.seriesInMemory.Set(0)
level.Info(d.log).Log("msg", "all chunks fetched, building block index")
meta := &metadata.Meta{
BlockMeta: tsdb.BlockMeta{
ULID: d.ulid,
Version: 1,
MinTime: int64(d.startTime),
MaxTime: int64(d.endTime),
Compaction: tsdb.BlockMetaCompaction{
Level: 1,
Sources: []ulid.ULID{d.ulid},
},
},
Thanos: metadata.Thanos{
Labels: labels,
Source: metadata.SourceType(source),
SegmentFiles: block.GetSegmentFiles(d.tmpBlockDir),
},
}
toClose := map[string]io.Closer{}
defer func() {
for k, c := range toClose {
err := c.Close()
if err != nil {
level.Error(d.log).Log("msg", "close failed", "name", k, "err", err)
}
}
}()
const (
indexWriterName = "index writer"
unsortedChunksReaderName = "unsorted chunks reader"
chunksWriterName = "chunks writer"
)
indexWriter, err := index.NewWriter(context.Background(), filepath.Join(d.tmpBlockDir, "index"))
if err != nil {
return ulid.ULID{}, errors.Wrap(err, indexWriterName)
}
toClose[indexWriterName] = indexWriter
symbols, err := addSymbolsToIndex(indexWriter, d.series)
if err != nil {
return ulid.ULID{}, errors.Wrap(err, "adding symbols")
}
level.Info(d.log).Log("msg", "added symbols to index", "count", symbols)
unsortedChunksReader, err := chunks.NewDirReader(filepath.Join(d.tmpBlockDir, unsortedChunksDir), nil)
if err != nil {
return ulid.ULID{}, errors.Wrap(err, unsortedChunksReaderName)
}
toClose[unsortedChunksReaderName] = unsortedChunksReader
chunksWriter, err := chunks.NewWriter(filepath.Join(d.tmpBlockDir, "chunks"))
if err != nil {
return ulid.ULID{}, errors.Wrap(err, chunksWriterName)
}
toClose[chunksWriterName] = chunksWriter
stats, err := addSeriesToIndex(indexWriter, d.series, unsortedChunksReader, chunksWriter)
if err != nil {
return ulid.ULID{}, errors.Wrap(err, "adding series")
}
meta.Stats = stats
level.Info(d.log).Log("msg", "added series to index", "series", stats.NumSeries, "chunks", stats.NumChunks, "samples", stats.NumSamples)
// Close index writer, unsorted chunks reader and chunks writer.
for k, c := range toClose {
delete(toClose, k)
err := c.Close()
if err != nil {
return ulid.ULID{}, errors.Wrapf(err, "closing %s", k)
}
}
// Delete unsorted chunks, they are no longer needed.
if err := os.RemoveAll(filepath.Join(d.tmpBlockDir, unsortedChunksDir)); err != nil {
return ulid.ULID{}, errors.Wrap(err, "deleting unsorted chunks")
}
if err := metadata.Write(d.log, d.tmpBlockDir, meta); err != nil {
return ulid.ULID{}, errors.Wrap(err, "writing meta.json")
}
if err := os.Rename(d.tmpBlockDir, filepath.Join(d.outDir, d.ulid.String())); err != nil {
return ulid.ULID{}, errors.Wrap(err, "rename to final directory")
}
return d.ulid, nil
}
func addSeriesToIndex(indexWriter *index.Writer, sl *seriesList, unsortedChunksReader *chunks.Reader, chunksWriter *chunks.Writer) (tsdb.BlockStats, error) {
var stats tsdb.BlockStats
it, err := sl.seriesIterator()
if err != nil {
return stats, errors.Wrap(err, "reading series")
}
ix := 0
for s, ok := it.Next(); ok; s, ok = it.Next() {
l := s.Metric
cs := s.Chunks
// Read chunks into memory.
for ix := range s.Chunks {
cs[ix].Chunk, err = unsortedChunksReader.Chunk(cs[ix].Ref)
if err != nil {
return stats, errors.Wrap(err, "failed to read chunk")
}
cs[ix].Ref = 0
}
// Write chunks again. This time they will be written in the same order as series.
err = chunksWriter.WriteChunks(cs...)
if err != nil {
return stats, errors.Wrap(err, "failed to write sorted chunks")
}
// Remove chunks data from memory, but keep reference for writing to index.
for ix := range cs {
if cs[ix].Ref == 0 {
return stats, errors.Errorf("chunk ref not set after writing sorted chunks")
}
cs[ix].Chunk = nil
}
if err := indexWriter.AddSeries(uint64(ix), l, cs...); err != nil {
return stats, errors.Wrapf(err, "adding series %v", l)
}
ix++
stats.NumSamples += s.Samples
stats.NumSeries++
stats.NumChunks += uint64(len(cs))
}
return stats, nil
}
func addSymbolsToIndex(indexWriter *index.Writer, sl *seriesList) (int, error) {
symbols := 0
it, err := sl.symbolsIterator()
if err != nil {
return 0, errors.Wrap(err, "reading symbols")
}
for s, ok := it.Next(); ok; s, ok = it.Next() {
symbols++
if err := indexWriter.AddSymbol(s); err != nil {
_ = it.Close() // Make sure to close any open files.
return 0, errors.Wrapf(err, "adding symbol %v", s)
}
}
if err := it.Error(); err != nil {
_ = it.Close() // Make sure to close any open files.
return 0, err
}
if err := it.Close(); err != nil {
return 0, err
}
return symbols, nil
}