prometheus/tsdb/tsdbblockutil.go

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// Copyright 2019 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"
"fmt"
"path/filepath"
"github.com/go-kit/log"
"github.com/prometheus/prometheus/storage"
"github.com/prometheus/prometheus/tsdb/chunkenc"
)
var ErrInvalidTimes = fmt.Errorf("max time is lesser than min time")
// CreateBlock creates a chunkrange block from the samples passed to it, and writes it to disk.
func CreateBlock(series []storage.Series, dir string, chunkRange int64, logger log.Logger) (string, error) {
if chunkRange == 0 {
chunkRange = DefaultBlockDuration
}
if chunkRange < 0 {
return "", ErrInvalidTimes
}
w, err := NewBlockWriter(logger, dir, chunkRange)
if err != nil {
return "", err
}
defer func() {
if err := w.Close(); err != nil {
logger.Log("err closing blockwriter", err.Error())
}
}()
sampleCount := 0
const commitAfter = 10000
ctx := context.Background()
app := w.Appender(ctx)
for _, s := range series {
ref := storage.SeriesRef(0)
it := s.Iterator()
lset := s.Labels()
typ := it.Next()
lastTyp := typ
for ; typ != chunkenc.ValNone; typ = it.Next() {
if lastTyp != typ {
// The behaviour of appender is undefined if samples of different types
// are appended to the same series in a single Commit().
if err = app.Commit(); err != nil {
return "", err
}
app = w.Appender(ctx)
sampleCount = 0
}
switch typ {
case chunkenc.ValFloat:
t, v := it.At()
ref, err = app.Append(ref, lset, t, v)
case chunkenc.ValHistogram:
t, h := it.AtHistogram()
ref, err = app.AppendHistogram(ref, lset, t, h)
default:
return "", fmt.Errorf("unknown sample type %s", typ.String())
}
if err != nil {
return "", err
}
sampleCount++
lastTyp = typ
}
if it.Err() != nil {
return "", it.Err()
}
// Commit and make a new appender periodically, to avoid building up data in memory.
if sampleCount > commitAfter {
if err = app.Commit(); err != nil {
return "", err
}
app = w.Appender(ctx)
sampleCount = 0
}
}
if err = app.Commit(); err != nil {
return "", err
}
ulid, err := w.Flush(ctx)
if err != nil {
return "", err
}
return filepath.Join(dir, ulid.String()), nil
}