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To avoid building up data in memory, commit and make a new appender periodically. The number `commitAfter = 10000` was chosen arbitrarily; testing with 10x more or less gives slightly worse results. Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
88 lines
2.1 KiB
Go
88 lines
2.1 KiB
Go
// Copyright 2019 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tsdb
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import (
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"context"
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"fmt"
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"path/filepath"
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"github.com/go-kit/log"
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"github.com/prometheus/prometheus/storage"
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)
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var ErrInvalidTimes = fmt.Errorf("max time is lesser than min time")
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// CreateBlock creates a chunkrange block from the samples passed to it, and writes it to disk.
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func CreateBlock(series []storage.Series, dir string, chunkRange int64, logger log.Logger) (string, error) {
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if chunkRange == 0 {
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chunkRange = DefaultBlockDuration
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}
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if chunkRange < 0 {
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return "", ErrInvalidTimes
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}
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w, err := NewBlockWriter(logger, dir, chunkRange)
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if err != nil {
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return "", err
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}
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defer func() {
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if err := w.Close(); err != nil {
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logger.Log("err closing blockwriter", err.Error())
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}
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}()
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sampleCount := 0
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const commitAfter = 10000
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ctx := context.Background()
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app := w.Appender(ctx)
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for _, s := range series {
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ref := storage.SeriesRef(0)
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it := s.Iterator()
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lset := s.Labels()
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for it.Next() {
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t, v := it.At()
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ref, err = app.Append(ref, lset, t, v)
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if err != nil {
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return "", err
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}
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sampleCount++
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}
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if it.Err() != nil {
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return "", it.Err()
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}
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// Commit and make a new appender periodically, to avoid building up data in memory.
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if sampleCount > commitAfter {
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if err = app.Commit(); err != nil {
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return "", err
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}
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app = w.Appender(ctx)
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sampleCount = 0
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}
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}
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if err = app.Commit(); err != nil {
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return "", err
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}
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ulid, err := w.Flush(ctx)
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if err != nil {
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return "", err
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}
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return filepath.Join(dir, ulid.String()), nil
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}
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