forked from thanos-io/thanos
/
downsample.go
266 lines (225 loc) · 7.45 KB
/
downsample.go
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package main
import (
"context"
"encoding/json"
"os"
"path"
"path/filepath"
"time"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/improbable-eng/thanos/pkg/block"
"github.com/improbable-eng/thanos/pkg/block/metadata"
"github.com/improbable-eng/thanos/pkg/compact/downsample"
"github.com/improbable-eng/thanos/pkg/component"
"github.com/improbable-eng/thanos/pkg/objstore"
"github.com/improbable-eng/thanos/pkg/objstore/client"
"github.com/improbable-eng/thanos/pkg/runutil"
"github.com/oklog/run"
"github.com/oklog/ulid"
"github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/tsdb"
"github.com/prometheus/tsdb/chunkenc"
"gopkg.in/alecthomas/kingpin.v2"
)
func registerDownsample(m map[string]setupFunc, app *kingpin.Application, name string) {
cmd := app.Command(name, "continuously downsamples blocks in an object store bucket")
dataDir := cmd.Flag("data-dir", "Data directory in which to cache blocks and process downsamplings.").
Default("./data").String()
objStoreConfig := regCommonObjStoreFlags(cmd, "", true)
m[name] = func(g *run.Group, logger log.Logger, reg *prometheus.Registry, tracer opentracing.Tracer, _ bool) error {
return runDownsample(g, logger, reg, *dataDir, objStoreConfig)
}
}
func runDownsample(
g *run.Group,
logger log.Logger,
reg *prometheus.Registry,
dataDir string,
objStoreConfig *pathOrContent,
) error {
confContentYaml, err := objStoreConfig.Content()
if err != nil {
return err
}
bkt, err := client.NewBucket(logger, confContentYaml, reg, component.Downsample.String())
if err != nil {
return err
}
// Ensure we close up everything properly.
defer func() {
if err != nil {
runutil.CloseWithLogOnErr(logger, bkt, "bucket client")
}
}()
// Start cycle of syncing blocks from the bucket and garbage collecting the bucket.
{
ctx, cancel := context.WithCancel(context.Background())
g.Add(func() error {
defer runutil.CloseWithLogOnErr(logger, bkt, "bucket client")
level.Info(logger).Log("msg", "start first pass of downsampling")
if err := downsampleBucket(ctx, logger, bkt, dataDir); err != nil {
return errors.Wrap(err, "downsampling failed")
}
level.Info(logger).Log("msg", "start second pass of downsampling")
if err := downsampleBucket(ctx, logger, bkt, dataDir); err != nil {
return errors.Wrap(err, "downsampling failed")
}
return nil
}, func(error) {
cancel()
})
}
level.Info(logger).Log("msg", "starting downsample node")
return nil
}
func downsampleBucket(
ctx context.Context,
logger log.Logger,
bkt objstore.Bucket,
dir string,
) error {
if err := os.RemoveAll(dir); err != nil {
return errors.Wrap(err, "clean working directory")
}
if err := os.MkdirAll(dir, 0777); err != nil {
return errors.Wrap(err, "create dir")
}
var metas []*metadata.Meta
err := bkt.Iter(ctx, "", func(name string) error {
id, ok := block.IsBlockDir(name)
if !ok {
return nil
}
rc, err := bkt.Get(ctx, path.Join(id.String(), block.MetaFilename))
if err != nil {
return errors.Wrapf(err, "get meta for block %s", id)
}
defer runutil.CloseWithLogOnErr(logger, rc, "block reader")
var m metadata.Meta
if err := json.NewDecoder(rc).Decode(&m); err != nil {
return errors.Wrap(err, "decode meta")
}
metas = append(metas, &m)
return nil
})
if err != nil {
return errors.Wrap(err, "retrieve bucket block metas")
}
// mapping from a hash over all source IDs to blocks. We don't need to downsample a block
// if a downsampled version with the same hash already exists.
sources5m := map[ulid.ULID]struct{}{}
sources1h := map[ulid.ULID]struct{}{}
for _, m := range metas {
switch m.Thanos.Downsample.Resolution {
case 0:
continue
case 5 * 60 * 1000:
for _, id := range m.Compaction.Sources {
sources5m[id] = struct{}{}
}
case 60 * 60 * 1000:
for _, id := range m.Compaction.Sources {
sources1h[id] = struct{}{}
}
default:
return errors.Errorf("unexpected downsampling resolution %d", m.Thanos.Downsample.Resolution)
}
}
for _, m := range metas {
switch m.Thanos.Downsample.Resolution {
case 0:
missing := false
for _, id := range m.Compaction.Sources {
if _, ok := sources5m[id]; !ok {
missing = true
break
}
}
if !missing {
continue
}
// Only downsample blocks once we are sure to get roughly 2 chunks out of it.
// NOTE(fabxc): this must match with at which block size the compactor creates downsampled
// blocks. Otherwise we may never downsample some data.
if m.MaxTime-m.MinTime < 40*60*60*1000 {
continue
}
if err := processDownsampling(ctx, logger, bkt, m, dir, 5*60*1000); err != nil {
return errors.Wrap(err, "downsampling to 5 min")
}
case 5 * 60 * 1000:
missing := false
for _, id := range m.Compaction.Sources {
if _, ok := sources1h[id]; !ok {
missing = true
break
}
}
if !missing {
continue
}
// Only downsample blocks once we are sure to get roughly 2 chunks out of it.
// NOTE(fabxc): this must match with at which block size the compactor creates downsampled
// blocks. Otherwise we may never downsample some data.
if m.MaxTime-m.MinTime < 10*24*60*60*1000 {
continue
}
if err := processDownsampling(ctx, logger, bkt, m, dir, 60*60*1000); err != nil {
return errors.Wrap(err, "downsampling to 60 min")
}
}
}
return nil
}
func processDownsampling(ctx context.Context, logger log.Logger, bkt objstore.Bucket, m *metadata.Meta, dir string, resolution int64) error {
begin := time.Now()
bdir := filepath.Join(dir, m.ULID.String())
err := block.Download(ctx, logger, bkt, m.ULID, bdir)
if err != nil {
return errors.Wrapf(err, "download block %s", m.ULID)
}
level.Info(logger).Log("msg", "downloaded block", "id", m.ULID, "duration", time.Since(begin))
if err := block.VerifyIndex(logger, filepath.Join(bdir, block.IndexFilename), m.MinTime, m.MaxTime); err != nil {
return errors.Wrap(err, "input block index not valid")
}
begin = time.Now()
var pool chunkenc.Pool
if m.Thanos.Downsample.Resolution == 0 {
pool = chunkenc.NewPool()
} else {
pool = downsample.NewPool()
}
b, err := tsdb.OpenBlock(logger, bdir, pool)
if err != nil {
return errors.Wrapf(err, "open block %s", m.ULID)
}
defer runutil.CloseWithLogOnErr(log.With(logger, "outcome", "potential left mmap file handlers left"), b, "tsdb reader")
id, err := downsample.Downsample(logger, m, b, dir, resolution)
if err != nil {
return errors.Wrapf(err, "downsample block %s to window %d", m.ULID, resolution)
}
resdir := filepath.Join(dir, id.String())
level.Info(logger).Log("msg", "downsampled block",
"from", m.ULID, "to", id, "duration", time.Since(begin))
if err := block.VerifyIndex(logger, filepath.Join(resdir, block.IndexFilename), m.MinTime, m.MaxTime); err != nil {
return errors.Wrap(err, "output block index not valid")
}
begin = time.Now()
err = block.Upload(ctx, logger, bkt, resdir)
if err != nil {
return errors.Wrapf(err, "upload downsampled block %s", id)
}
level.Info(logger).Log("msg", "uploaded block", "id", id, "duration", time.Since(begin))
begin = time.Now()
// It is not harmful if these fails.
if err := os.RemoveAll(bdir); err != nil {
level.Warn(logger).Log("msg", "failed to clean directory", "dir", bdir, "err", err)
}
if err := os.RemoveAll(resdir); err != nil {
level.Warn(logger).Log("msg", "failed to clean directory", "resdir", bdir, "err", err)
}
return nil
}