forked from thanos-io/thanos
/
compact.go
476 lines (398 loc) · 15.5 KB
/
compact.go
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package main
import (
"context"
"fmt"
"os"
"path"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/oklog/run"
"github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/prometheus/tsdb"
"github.com/thanos-io/thanos/pkg/block"
"github.com/thanos-io/thanos/pkg/block/metadata"
"github.com/thanos-io/thanos/pkg/compact"
"github.com/thanos-io/thanos/pkg/compact/downsample"
"github.com/thanos-io/thanos/pkg/component"
"github.com/thanos-io/thanos/pkg/extflag"
"github.com/thanos-io/thanos/pkg/objstore"
"github.com/thanos-io/thanos/pkg/objstore/client"
"github.com/thanos-io/thanos/pkg/prober"
"github.com/thanos-io/thanos/pkg/runutil"
httpserver "github.com/thanos-io/thanos/pkg/server/http"
"gopkg.in/alecthomas/kingpin.v2"
)
var (
compactions = compactionSet{
1 * time.Hour,
2 * time.Hour,
8 * time.Hour,
2 * 24 * time.Hour,
14 * 24 * time.Hour,
}
)
type compactionSet []time.Duration
func (cs compactionSet) String() string {
result := make([]string, len(cs))
for i, c := range cs {
result[i] = fmt.Sprintf("%d=%dh", i, int(c.Hours()))
}
return strings.Join(result, ", ")
}
// levels returns set of compaction levels not higher than specified max compaction level.
func (cs compactionSet) levels(maxLevel int) ([]int64, error) {
if maxLevel >= len(cs) {
return nil, errors.Errorf("level is bigger then default set of %d", len(cs))
}
levels := make([]int64, maxLevel+1)
for i, c := range cs[:maxLevel+1] {
levels[i] = int64(c / time.Millisecond)
}
return levels, nil
}
// maxLevel returns max available compaction level.
func (cs compactionSet) maxLevel() int {
return len(cs) - 1
}
func registerCompact(m map[string]setupFunc, app *kingpin.Application) {
cmd := app.Command(component.Compact.String(), "continuously compacts blocks in an object store bucket")
haltOnError := cmd.Flag("debug.halt-on-error", "Halt the process if a critical compaction error is detected.").
Hidden().Default("true").Bool()
acceptMalformedIndex := cmd.Flag("debug.accept-malformed-index",
"Compaction index verification will ignore out of order label names.").
Hidden().Default("false").Bool()
httpAddr, httpGracePeriod := regHTTPFlags(cmd)
dataDir := cmd.Flag("data-dir", "Data directory in which to cache blocks and process compactions.").
Default("./data").String()
objStoreConfig := regCommonObjStoreFlags(cmd, "", true)
consistencyDelay := modelDuration(cmd.Flag("consistency-delay", fmt.Sprintf("Minimum age of fresh (non-compacted) blocks before they are being processed. Malformed blocks older than the maximum of consistency-delay and %s will be removed.", compact.MinimumAgeForRemoval)).
Default("30m"))
retentionRaw := modelDuration(cmd.Flag("retention.resolution-raw", "How long to retain raw samples in bucket. 0d - disables this retention").Default("0d"))
retention5m := modelDuration(cmd.Flag("retention.resolution-5m", "How long to retain samples of resolution 1 (5 minutes) in bucket. 0d - disables this retention").Default("0d"))
retention1h := modelDuration(cmd.Flag("retention.resolution-1h", "How long to retain samples of resolution 2 (1 hour) in bucket. 0d - disables this retention").Default("0d"))
wait := cmd.Flag("wait", "Do not exit after all compactions have been processed and wait for new work.").
Short('w').Bool()
generateMissingIndexCacheFiles := cmd.Flag("index.generate-missing-cache-file", "If enabled, on startup compactor runs an on-off job that scans all the blocks to find all blocks with missing index cache file. It generates those if needed and upload.").
Hidden().Default("false").Bool()
disableDownsampling := cmd.Flag("downsampling.disable", "Disables downsampling. This is not recommended "+
"as querying long time ranges without non-downsampled data is not efficient and useful e.g it is not possible to render all samples for a human eye anyway").
Default("false").Bool()
maxCompactionLevel := cmd.Flag("debug.max-compaction-level", fmt.Sprintf("Maximum compaction level, default is %d: %s", compactions.maxLevel(), compactions.String())).
Hidden().Default(strconv.Itoa(compactions.maxLevel())).Int()
blockSyncConcurrency := cmd.Flag("block-sync-concurrency", "Number of goroutines to use when syncing block metadata from object storage.").
Default("20").Int()
compactionConcurrency := cmd.Flag("compact.concurrency", "Number of goroutines to use when compacting groups.").
Default("1").Int()
selectorRelabelConf := regSelectorRelabelFlags(cmd)
m[component.Compact.String()] = func(g *run.Group, logger log.Logger, reg *prometheus.Registry, tracer opentracing.Tracer, _ bool) error {
return runCompact(g, logger, reg,
*httpAddr,
time.Duration(*httpGracePeriod),
*dataDir,
objStoreConfig,
time.Duration(*consistencyDelay),
*haltOnError,
*acceptMalformedIndex,
*wait,
*generateMissingIndexCacheFiles,
map[compact.ResolutionLevel]time.Duration{
compact.ResolutionLevelRaw: time.Duration(*retentionRaw),
compact.ResolutionLevel5m: time.Duration(*retention5m),
compact.ResolutionLevel1h: time.Duration(*retention1h),
},
component.Compact,
*disableDownsampling,
*maxCompactionLevel,
*blockSyncConcurrency,
*compactionConcurrency,
selectorRelabelConf,
)
}
}
func runCompact(
g *run.Group,
logger log.Logger,
reg *prometheus.Registry,
httpBindAddr string,
httpGracePeriod time.Duration,
dataDir string,
objStoreConfig *extflag.PathOrContent,
consistencyDelay time.Duration,
haltOnError bool,
acceptMalformedIndex bool,
wait bool,
generateMissingIndexCacheFiles bool,
retentionByResolution map[compact.ResolutionLevel]time.Duration,
component component.Component,
disableDownsampling bool,
maxCompactionLevel int,
blockSyncConcurrency int,
concurrency int,
selectorRelabelConf *extflag.PathOrContent,
) error {
halted := prometheus.NewGauge(prometheus.GaugeOpts{
Name: "thanos_compactor_halted",
Help: "Set to 1 if the compactor halted due to an unexpected error",
})
retried := prometheus.NewCounter(prometheus.CounterOpts{
Name: "thanos_compactor_retries_total",
Help: "Total number of retries after retriable compactor error",
})
iterations := prometheus.NewCounter(prometheus.CounterOpts{
Name: "thanos_compactor_iterations_total",
Help: "Total number of iterations that were executed successfully",
})
halted.Set(0)
reg.MustRegister(halted)
reg.MustRegister(retried)
reg.MustRegister(iterations)
downsampleMetrics := newDownsampleMetrics(reg)
statusProber := prober.NewProber(component, logger, prometheus.WrapRegistererWithPrefix("thanos_", reg))
// Initiate HTTP listener providing metrics endpoint and readiness/liveness probes.
srv := httpserver.New(logger, reg, component, statusProber,
httpserver.WithListen(httpBindAddr),
httpserver.WithGracePeriod(httpGracePeriod),
)
g.Add(srv.ListenAndServe, srv.Shutdown)
confContentYaml, err := objStoreConfig.Content()
if err != nil {
return err
}
bkt, err := client.NewBucket(logger, confContentYaml, reg, component.String())
if err != nil {
return err
}
relabelContentYaml, err := selectorRelabelConf.Content()
if err != nil {
return errors.Wrap(err, "get content of relabel configuration")
}
relabelConfig, err := parseRelabelConfig(relabelContentYaml)
if err != nil {
return err
}
// Ensure we close up everything properly.
defer func() {
if err != nil {
runutil.CloseWithLogOnErr(logger, bkt, "bucket client")
}
}()
sy, err := compact.NewSyncer(logger, reg, bkt, consistencyDelay,
blockSyncConcurrency, acceptMalformedIndex, relabelConfig)
if err != nil {
return errors.Wrap(err, "create syncer")
}
levels, err := compactions.levels(maxCompactionLevel)
if err != nil {
return errors.Wrap(err, "get compaction levels")
}
if maxCompactionLevel < compactions.maxLevel() {
level.Warn(logger).Log("msg", "Max compaction level is lower than should be", "current", maxCompactionLevel, "default", compactions.maxLevel())
}
ctx, cancel := context.WithCancel(context.Background())
// Instantiate the compactor with different time slices. Timestamps in TSDB
// are in milliseconds.
comp, err := tsdb.NewLeveledCompactor(ctx, reg, logger, levels, downsample.NewPool())
if err != nil {
cancel()
return errors.Wrap(err, "create compactor")
}
var (
compactDir = path.Join(dataDir, "compact")
downsamplingDir = path.Join(dataDir, "downsample")
indexCacheDir = path.Join(dataDir, "index_cache")
)
if err := os.RemoveAll(downsamplingDir); err != nil {
cancel()
return errors.Wrap(err, "clean working downsample directory")
}
compactor, err := compact.NewBucketCompactor(logger, sy, comp, compactDir, bkt, concurrency)
if err != nil {
cancel()
return errors.Wrap(err, "create bucket compactor")
}
if retentionByResolution[compact.ResolutionLevelRaw].Seconds() != 0 {
level.Info(logger).Log("msg", "retention policy of raw samples is enabled", "duration", retentionByResolution[compact.ResolutionLevelRaw])
}
if retentionByResolution[compact.ResolutionLevel5m].Seconds() != 0 {
level.Info(logger).Log("msg", "retention policy of 5 min aggregated samples is enabled", "duration", retentionByResolution[compact.ResolutionLevel5m])
}
if retentionByResolution[compact.ResolutionLevel1h].Seconds() != 0 {
level.Info(logger).Log("msg", "retention policy of 1 hour aggregated samples is enabled", "duration", retentionByResolution[compact.ResolutionLevel1h])
}
f := func() error {
if err := compactor.Compact(ctx); err != nil {
return errors.Wrap(err, "compaction failed")
}
level.Info(logger).Log("msg", "compaction iterations done")
// TODO(bplotka): Remove "disableDownsampling" once https://github.com/thanos-io/thanos/issues/297 is fixed.
if !disableDownsampling {
// After all compactions are done, work down the downsampling backlog.
// We run two passes of this to ensure that the 1h downsampling is generated
// for 5m downsamplings created in the first run.
level.Info(logger).Log("msg", "start first pass of downsampling")
if err := downsampleBucket(ctx, logger, downsampleMetrics, bkt, downsamplingDir); err != nil {
return errors.Wrap(err, "first pass of downsampling failed")
}
level.Info(logger).Log("msg", "start second pass of downsampling")
if err := downsampleBucket(ctx, logger, downsampleMetrics, bkt, downsamplingDir); err != nil {
return errors.Wrap(err, "second pass of downsampling failed")
}
level.Info(logger).Log("msg", "downsampling iterations done")
} else {
level.Warn(logger).Log("msg", "downsampling was explicitly disabled")
}
if err := compact.ApplyRetentionPolicyByResolution(ctx, logger, bkt, retentionByResolution); err != nil {
return errors.Wrap(err, fmt.Sprintf("retention failed"))
}
return nil
}
g.Add(func() error {
defer runutil.CloseWithLogOnErr(logger, bkt, "bucket client")
// Generate index file.
if generateMissingIndexCacheFiles {
if err := genMissingIndexCacheFiles(ctx, logger, reg, bkt, indexCacheDir); err != nil {
return err
}
}
if !wait {
return f()
}
// --wait=true is specified.
return runutil.Repeat(5*time.Minute, ctx.Done(), func() error {
err := f()
if err == nil {
iterations.Inc()
return nil
}
// The HaltError type signals that we hit a critical bug and should block
// for investigation. You should alert on this being halted.
if compact.IsHaltError(err) {
if haltOnError {
level.Error(logger).Log("msg", "critical error detected; halting", "err", err)
halted.Set(1)
select {}
} else {
return errors.Wrap(err, "critical error detected")
}
}
// The RetryError signals that we hit an retriable error (transient error, no connection).
// You should alert on this being triggered too frequently.
if compact.IsRetryError(err) {
level.Error(logger).Log("msg", "retriable error", "err", err)
retried.Inc()
// TODO(bplotka): use actual "retry()" here instead of waiting 5 minutes?
return nil
}
return errors.Wrap(err, "error executing compaction")
})
}, func(error) {
cancel()
})
level.Info(logger).Log("msg", "starting compact node")
statusProber.SetReady()
return nil
}
const (
metricIndexGenerateName = "thanos_compact_generated_index_total"
metricIndexGenerateHelp = "Total number of generated indexes."
)
// genMissingIndexCacheFiles scans over all blocks, generates missing index cache files and uploads them to object storage.
func genMissingIndexCacheFiles(ctx context.Context, logger log.Logger, reg *prometheus.Registry, bkt objstore.Bucket, dir string) error {
genIndex := prometheus.NewCounter(prometheus.CounterOpts{
Name: metricIndexGenerateName,
Help: metricIndexGenerateHelp,
})
reg.MustRegister(genIndex)
if err := os.RemoveAll(dir); err != nil {
return errors.Wrap(err, "clean index cache directory")
}
if err := os.MkdirAll(dir, 0777); err != nil {
return errors.Wrap(err, "create dir")
}
defer func() {
if err := os.RemoveAll(dir); err != nil {
level.Error(logger).Log("msg", "failed to remove index cache directory", "path", dir, "err", err)
}
}()
level.Info(logger).Log("msg", "start index cache processing")
var metas []*metadata.Meta
if err := bkt.Iter(ctx, "", func(name string) error {
id, ok := block.IsBlockDir(name)
if !ok {
return nil
}
meta, err := block.DownloadMeta(ctx, logger, bkt, id)
if err != nil {
// Probably not finished block, skip it.
if bkt.IsObjNotFoundErr(errors.Cause(err)) {
level.Warn(logger).Log("msg", "meta file wasn't found", "block", id.String())
return nil
}
return errors.Wrap(err, "download metadata")
}
// New version of compactor pushes index cache along with data block.
// Skip uncompacted blocks.
if meta.Compaction.Level == 1 {
return nil
}
metas = append(metas, &meta)
return nil
}); err != nil {
return errors.Wrap(err, "retrieve bucket block metas")
}
for _, meta := range metas {
if err := generateIndexCacheFile(ctx, bkt, logger, dir, meta); err != nil {
return err
}
genIndex.Inc()
}
level.Info(logger).Log("msg", "generating index cache files is done, you can remove startup argument `index.generate-missing-cache-file`")
return nil
}
func generateIndexCacheFile(
ctx context.Context,
bkt objstore.Bucket,
logger log.Logger,
indexCacheDir string,
meta *metadata.Meta,
) error {
id := meta.ULID
bdir := filepath.Join(indexCacheDir, id.String())
if err := os.MkdirAll(bdir, 0777); err != nil {
return errors.Wrap(err, "create block dir")
}
defer func() {
if err := os.RemoveAll(bdir); err != nil {
level.Error(logger).Log("msg", "failed to remove index cache directory", "path", bdir, "err", err)
}
}()
cachePath := filepath.Join(bdir, block.IndexCacheFilename)
cache := path.Join(meta.ULID.String(), block.IndexCacheFilename)
ok, err := objstore.Exists(ctx, bkt, cache)
if ok {
return nil
}
if err != nil {
return errors.Wrapf(err, "attempt to check if a cached index file exists")
}
level.Debug(logger).Log("msg", "make index cache", "block", id)
// Try to download index file from obj store.
indexPath := filepath.Join(bdir, block.IndexFilename)
index := path.Join(id.String(), block.IndexFilename)
if err := objstore.DownloadFile(ctx, logger, bkt, index, indexPath); err != nil {
return errors.Wrap(err, "download index file")
}
if err := block.WriteIndexCache(logger, indexPath, cachePath); err != nil {
return errors.Wrap(err, "write index cache")
}
if err := objstore.UploadFile(ctx, logger, bkt, cachePath, cache); err != nil {
return errors.Wrap(err, "upload index cache")
}
return nil
}