Add a tsdb writer interface (#7950)
* add a tsdb writer interface Signed-off-by: jessicagreben <jessicagrebens@gmail.com> * use block writer in tsdbutil block creator Signed-off-by: jessicagreben <jessicagrebens@gmail.com> * pass thru context Signed-off-by: jessicagreben <jessicagrebens@gmail.com> * use block writer in blockutil and also in tests Signed-off-by: jessicagreben <jessicagrebens@gmail.com> * fix link err Signed-off-by: jessicagreben <jessicagrebens@gmail.com> * add err handling for defer Signed-off-by: jessicagreben <jessicagrebens@gmail.com> * add blockwriter test Signed-off-by: jessicagreben <jessicagrebens@gmail.com> * mv initHead into NewBlockWriter, update tests Signed-off-by: jessicagreben <jessicagrebens@gmail.com> * use blocksize arg, make test more concise Signed-off-by: jessicagreben <jessicagrebens@gmail.com>
This commit is contained in:
Jess G
GitHub
parent
cf273f21bb
commit
90680b092c
|
|
@ -302,12 +302,9 @@ func TestReadIndexFormatV1(t *testing.T) {
|
|||
|
||||
// createBlock creates a block with given set of series and returns its dir.
|
||||
func createBlock(tb testing.TB, dir string, series []storage.Series) string {
|
||||
chunkDir, err := ioutil.TempDir("", "chunk_dir")
|
||||
blockDir, err := CreateBlock(series, dir, 0, log.NewNopLogger())
|
||||
testutil.Ok(tb, err)
|
||||
defer func() { testutil.Ok(tb, os.RemoveAll(chunkDir)) }()
|
||||
head := createHead(tb, nil, series, chunkDir)
|
||||
defer func() { testutil.Ok(tb, head.Close()) }()
|
||||
return createBlockFromHead(tb, dir, head)
|
||||
return blockDir
|
||||
}
|
||||
|
||||
func createBlockFromHead(tb testing.TB, dir string, head *Head) string {
|
||||
|
|
|
|||
|
|
@ -0,0 +1,122 @@
|
|||
// Copyright 2020 The Prometheus Authors
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package tsdb
|
||||
|
||||
import (
|
||||
"context"
|
||||
"io/ioutil"
|
||||
"math"
|
||||
"os"
|
||||
|
||||
"github.com/go-kit/kit/log"
|
||||
"github.com/go-kit/kit/log/level"
|
||||
"github.com/oklog/ulid"
|
||||
"github.com/pkg/errors"
|
||||
|
||||
"github.com/prometheus/prometheus/pkg/timestamp"
|
||||
"github.com/prometheus/prometheus/storage"
|
||||
"github.com/prometheus/prometheus/tsdb/chunkenc"
|
||||
)
|
||||
|
||||
// BlockWriter is a block writer that allows appending and flushing series to disk.
|
||||
type BlockWriter struct {
|
||||
logger log.Logger
|
||||
destinationDir string
|
||||
|
||||
head *Head
|
||||
blockSize int64 // in ms
|
||||
chunkDir string
|
||||
}
|
||||
|
||||
// NewBlockWriter create a new block writer.
|
||||
//
|
||||
// The returned writer accumulates all the series in the Head block until `Flush` is called.
|
||||
//
|
||||
// Note that the writer will not check if the target directory exists or
|
||||
// contains anything at all. It is the caller's responsibility to
|
||||
// ensure that the resulting blocks do not overlap etc.
|
||||
// Writer ensures the block flush is atomic (via rename).
|
||||
func NewBlockWriter(logger log.Logger, dir string, blockSize int64) (*BlockWriter, error) {
|
||||
w := &BlockWriter{
|
||||
logger: logger,
|
||||
destinationDir: dir,
|
||||
blockSize: blockSize,
|
||||
}
|
||||
if err := w.initHead(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return w, nil
|
||||
}
|
||||
|
||||
// initHead creates and initialises a new TSDB head.
|
||||
func (w *BlockWriter) initHead() error {
|
||||
chunkDir, err := ioutil.TempDir(os.TempDir(), "head")
|
||||
if err != nil {
|
||||
return errors.Wrap(err, "create temp dir")
|
||||
}
|
||||
w.chunkDir = chunkDir
|
||||
|
||||
h, err := NewHead(nil, w.logger, nil, w.blockSize, w.chunkDir, nil, DefaultStripeSize, nil)
|
||||
if err != nil {
|
||||
return errors.Wrap(err, "tsdb.NewHead")
|
||||
}
|
||||
|
||||
w.head = h
|
||||
return w.head.Init(math.MinInt64)
|
||||
}
|
||||
|
||||
// Appender returns a new appender on the database.
|
||||
// Appender can't be called concurrently. However, the returned Appender can safely be used concurrently.
|
||||
func (w *BlockWriter) Appender(ctx context.Context) storage.Appender {
|
||||
return w.head.Appender(ctx)
|
||||
}
|
||||
|
||||
// Flush implements the Writer interface. This is where actual block writing
|
||||
// happens. After flush completes, no writes can be done.
|
||||
func (w *BlockWriter) Flush(ctx context.Context) (ulid.ULID, error) {
|
||||
seriesCount := w.head.NumSeries()
|
||||
if w.head.NumSeries() == 0 {
|
||||
return ulid.ULID{}, errors.New("no series appended, aborting")
|
||||
}
|
||||
|
||||
mint := w.head.MinTime()
|
||||
// Add +1 millisecond to block maxt because block intervals are half-open: [b.MinTime, b.MaxTime).
|
||||
// Because of this block intervals are always +1 than the total samples it includes.
|
||||
maxt := w.head.MaxTime() + 1
|
||||
level.Info(w.logger).Log("msg", "flushing", "series_count", seriesCount, "mint", timestamp.Time(mint), "maxt", timestamp.Time(maxt))
|
||||
|
||||
compactor, err := NewLeveledCompactor(ctx,
|
||||
nil,
|
||||
w.logger,
|
||||
[]int64{w.blockSize},
|
||||
chunkenc.NewPool())
|
||||
if err != nil {
|
||||
return ulid.ULID{}, errors.Wrap(err, "create leveled compactor")
|
||||
}
|
||||
id, err := compactor.Write(w.destinationDir, w.head, mint, maxt, nil)
|
||||
if err != nil {
|
||||
return ulid.ULID{}, errors.Wrap(err, "compactor write")
|
||||
}
|
||||
|
||||
return id, nil
|
||||
}
|
||||
|
||||
func (w *BlockWriter) Close() error {
|
||||
defer func() {
|
||||
if err := os.RemoveAll(w.chunkDir); err != nil {
|
||||
level.Error(w.logger).Log("msg", "error in deleting BlockWriter files", "err", err)
|
||||
}
|
||||
}()
|
||||
return w.head.Close()
|
||||
}
|
||||
|
|
@ -0,0 +1,67 @@
|
|||
// Copyright 2020 The Prometheus Authors
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package tsdb
|
||||
|
||||
import (
|
||||
"context"
|
||||
"io/ioutil"
|
||||
"math"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"testing"
|
||||
|
||||
"github.com/go-kit/kit/log"
|
||||
"github.com/pkg/errors"
|
||||
"github.com/prometheus/prometheus/pkg/labels"
|
||||
"github.com/prometheus/prometheus/tsdb/tsdbutil"
|
||||
"github.com/prometheus/prometheus/util/testutil"
|
||||
)
|
||||
|
||||
func TestBlockWriter(t *testing.T) {
|
||||
ctx := context.Background()
|
||||
outputDir, err := ioutil.TempDir(os.TempDir(), "output")
|
||||
testutil.Ok(t, err)
|
||||
w, err := NewBlockWriter(log.NewNopLogger(), outputDir, DefaultBlockDuration)
|
||||
testutil.Ok(t, err)
|
||||
|
||||
// Flush with no series results in error.
|
||||
_, err = w.Flush(ctx)
|
||||
testutil.ErrorEqual(t, err, errors.New("no series appended, aborting"))
|
||||
|
||||
// Add some series.
|
||||
app := w.Appender(ctx)
|
||||
ts1, v1 := int64(44), float64(7)
|
||||
_, err = app.Add(labels.Labels{{Name: "a", Value: "b"}}, ts1, v1)
|
||||
testutil.Ok(t, err)
|
||||
ts2, v2 := int64(55), float64(12)
|
||||
_, err = app.Add(labels.Labels{{Name: "c", Value: "d"}}, ts2, v2)
|
||||
testutil.Ok(t, err)
|
||||
testutil.Ok(t, app.Commit())
|
||||
id, err := w.Flush(ctx)
|
||||
testutil.Ok(t, err)
|
||||
|
||||
// Confirm the block has the correct data.
|
||||
blockpath := filepath.Join(outputDir, id.String())
|
||||
b, err := OpenBlock(nil, blockpath, nil)
|
||||
testutil.Ok(t, err)
|
||||
q, err := NewBlockQuerier(b, math.MinInt64, math.MaxInt64)
|
||||
testutil.Ok(t, err)
|
||||
series := query(t, q, labels.MustNewMatcher(labels.MatchRegexp, "", ".*"))
|
||||
sample1 := []tsdbutil.Sample{sample{t: ts1, v: v1}}
|
||||
sample2 := []tsdbutil.Sample{sample{t: ts2, v: v2}}
|
||||
expectedSeries := map[string][]tsdbutil.Sample{"{a=\"b\"}": sample1, "{c=\"d\"}": sample2}
|
||||
testutil.Equals(t, expectedSeries, series)
|
||||
|
||||
testutil.Ok(t, w.Close())
|
||||
}
|
||||
|
|
@ -16,72 +16,61 @@ package tsdb
|
|||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"os"
|
||||
"path/filepath"
|
||||
|
||||
"github.com/go-kit/kit/log"
|
||||
"github.com/prometheus/prometheus/pkg/labels"
|
||||
"github.com/prometheus/prometheus/storage"
|
||||
)
|
||||
|
||||
var ErrInvalidTimes = fmt.Errorf("max time is lesser than min time")
|
||||
|
||||
type MetricSample struct {
|
||||
TimestampMs int64
|
||||
Value float64
|
||||
Labels labels.Labels
|
||||
}
|
||||
|
||||
// CreateHead creates a TSDB writer head to write the sample data to.
|
||||
func CreateHead(samples []*MetricSample, chunkRange int64, chunkDir string, logger log.Logger) (*Head, error) {
|
||||
head, err := NewHead(nil, logger, nil, chunkRange, chunkDir, nil, DefaultStripeSize, nil)
|
||||
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
app := head.Appender(context.TODO())
|
||||
for _, sample := range samples {
|
||||
_, err = app.Add(sample.Labels, sample.TimestampMs, sample.Value)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
err = app.Commit()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return head, nil
|
||||
}
|
||||
|
||||
// CreateBlock creates a chunkrange block from the samples passed to it, and writes it to disk.
|
||||
func CreateBlock(samples []*MetricSample, dir string, mint, maxt int64, logger log.Logger) (string, error) {
|
||||
chunkRange := maxt - mint
|
||||
func CreateBlock(series []storage.Series, dir string, chunkRange int64, logger log.Logger) (string, error) {
|
||||
if chunkRange == 0 {
|
||||
chunkRange = DefaultBlockDuration
|
||||
}
|
||||
if chunkRange < 0 {
|
||||
return "", ErrInvalidTimes
|
||||
}
|
||||
chunkDir := filepath.Join(dir, "chunks_tmp")
|
||||
|
||||
w, err := NewBlockWriter(logger, dir, chunkRange)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
defer func() {
|
||||
os.RemoveAll(chunkDir)
|
||||
if err := w.Close(); err != nil {
|
||||
logger.Log("err closing blockwriter", err.Error())
|
||||
}
|
||||
}()
|
||||
head, err := CreateHead(samples, chunkRange, chunkDir, logger)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
defer head.Close()
|
||||
|
||||
compactor, err := NewLeveledCompactor(context.Background(), nil, logger, ExponentialBlockRanges(DefaultBlockDuration, 3, 5), nil)
|
||||
if err != nil {
|
||||
ctx := context.Background()
|
||||
app := w.Appender(ctx)
|
||||
|
||||
for _, s := range series {
|
||||
ref := uint64(0)
|
||||
it := s.Iterator()
|
||||
for it.Next() {
|
||||
t, v := it.At()
|
||||
if ref != 0 {
|
||||
if err := app.AddFast(ref, t, v); err == nil {
|
||||
continue
|
||||
}
|
||||
}
|
||||
ref, err = app.Add(s.Labels(), t, v)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
}
|
||||
if it.Err() != nil {
|
||||
return "", it.Err()
|
||||
}
|
||||
}
|
||||
|
||||
if err = app.Commit(); err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
err = os.MkdirAll(dir, 0777)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
ulid, err := compactor.Write(dir, head, mint, maxt, nil)
|
||||
ulid, err := w.Flush(ctx)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue