prometheus/storage/local/preload.go

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// Copyright 2014 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 local
import (
"time"
"github.com/prometheus/common/model"
)
// memorySeriesPreloader is a Preloader for the memorySeriesStorage.
type memorySeriesPreloader struct {
storage *memorySeriesStorage
pinnedChunkDescs []*chunkDesc
}
// PreloadRange implements Preloader.
func (p *memorySeriesPreloader) PreloadRange(
fp model.Fingerprint,
from model.Time, through model.Time,
) SeriesIterator {
cds, iter := p.storage.preloadChunksForRange(fp, from, through, false)
p.pinnedChunkDescs = append(p.pinnedChunkDescs, cds...)
return iter
}
// PreloadInstant implements Preloader
func (p *memorySeriesPreloader) PreloadInstant(
fp model.Fingerprint,
timestamp model.Time, stalenessDelta time.Duration,
) SeriesIterator {
cds, iter := p.storage.preloadChunksForRange(fp, timestamp.Add(-stalenessDelta), timestamp, true)
p.pinnedChunkDescs = append(p.pinnedChunkDescs, cds...)
return iter
}
// Close implements Preloader.
func (p *memorySeriesPreloader) Close() {
for _, cd := range p.pinnedChunkDescs {
cd.unpin(p.storage.evictRequests)
}
chunkOps.WithLabelValues(unpin).Add(float64(len(p.pinnedChunkDescs)))
}