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454ecf3f52
In a way, our instants were also ranges, just with the staleness delta as range length. They are no treated equally, just that in one case, the range length is set as range, in the other the staleness delta. However, there are "real" instants where start and and time of a query is the same. In those cases, we only want to return a single value (the one closest before or at the equal start and end time). If that value is the last sample in the series, odds are we have it already in the series object. In that case, there is no need to pin or load any chunks. A special singleSampleSeriesIterator is created for that. This should greatly speed up instant queries as they happen frequently for rule evaluations.
62 lines
1.8 KiB
Go
62 lines
1.8 KiB
Go
// Copyright 2014 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 local
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import (
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"time"
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"github.com/prometheus/common/model"
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)
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// memorySeriesPreloader is a Preloader for the memorySeriesStorage.
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type memorySeriesPreloader struct {
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storage *memorySeriesStorage
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pinnedChunkDescs []*chunkDesc
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}
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// PreloadRange implements Preloader.
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func (p *memorySeriesPreloader) PreloadRange(
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fp model.Fingerprint,
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from model.Time, through model.Time,
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) (SeriesIterator, error) {
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cds, iter, err := p.storage.preloadChunksForRange(fp, from, through, false)
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if err != nil {
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return iter, err
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}
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p.pinnedChunkDescs = append(p.pinnedChunkDescs, cds...)
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return iter, nil
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}
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// PreloadInstant implements Preloader
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func (p *memorySeriesPreloader) PreloadInstant(
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fp model.Fingerprint,
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timestamp model.Time, stalenessDelta time.Duration,
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) (SeriesIterator, error) {
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cds, iter, err := p.storage.preloadChunksForRange(fp, timestamp.Add(-stalenessDelta), timestamp, true)
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if err != nil {
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return iter, err
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}
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p.pinnedChunkDescs = append(p.pinnedChunkDescs, cds...)
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return iter, nil
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}
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// Close implements Preloader.
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func (p *memorySeriesPreloader) Close() {
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for _, cd := range p.pinnedChunkDescs {
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cd.unpin(p.storage.evictRequests)
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}
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chunkOps.WithLabelValues(unpin).Add(float64(len(p.pinnedChunkDescs)))
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}
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