prometheus/storage/local/preload.go

112 lines
3.3 KiB
Go

// Copyright 2014 Prometheus Team
// 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"
clientmodel "github.com/prometheus/client_golang/model"
)
// memorySeriesPreloader is a Preloader for the memorySeriesStorage.
type memorySeriesPreloader struct {
storage *memorySeriesStorage
pinnedChunkDescs []*chunkDesc
}
// PreloadRange implements Preloader.
func (p *memorySeriesPreloader) PreloadRange(
fp clientmodel.Fingerprint,
from clientmodel.Timestamp, through clientmodel.Timestamp,
stalenessDelta time.Duration,
) error {
cds, err := p.storage.preloadChunksForRange(fp, from, through, stalenessDelta)
if err != nil {
return err
}
p.pinnedChunkDescs = append(p.pinnedChunkDescs, cds...)
return nil
}
/*
// GetMetricAtTime implements Preloader.
func (p *memorySeriesPreloader) GetMetricAtTime(fp clientmodel.Fingerprint, t clientmodel.Timestamp) error {
cds, err := p.storage.preloadChunks(fp, &timeSelector{
from: t,
through: t,
})
if err != nil {
return err
}
p.pinnedChunkDescs = append(p.pinnedChunkDescs, cds...)
return nil
}
// GetMetricAtInterval implements Preloader.
func (p *memorySeriesPreloader) GetMetricAtInterval(fp clientmodel.Fingerprint, from, through clientmodel.Timestamp, interval time.Duration) error {
cds, err := p.storage.preloadChunks(fp, &timeSelector{
from: from,
through: through,
interval: interval,
})
if err != nil {
return err
}
p.pinnedChunkDescs = append(p.pinnedChunkDescs, cds...)
return
}
// GetMetricRange implements Preloader.
func (p *memorySeriesPreloader) GetMetricRange(fp clientmodel.Fingerprint, t clientmodel.Timestamp, rangeDuration time.Duration) error {
cds, err := p.storage.preloadChunks(fp, &timeSelector{
from: t,
through: t,
rangeDuration: through.Sub(from),
})
if err != nil {
return err
}
p.pinnedChunkDescs = append(p.pinnedChunkDescs, cds...)
return
}
// GetMetricRangeAtInterval implements Preloader.
func (p *memorySeriesPreloader) GetMetricRangeAtInterval(fp clientmodel.Fingerprint, from, through clientmodel.Timestamp, interval, rangeDuration time.Duration) error {
cds, err := p.storage.preloadChunks(fp, &timeSelector{
from: from,
through: through,
interval: interval,
rangeDuration: rangeDuration,
})
if err != nil {
return err
}
p.pinnedChunkDescs = append(p.pinnedChunkDescs, cds...)
return
}
*/
// Close implements Preloader.
func (p *memorySeriesPreloader) Close() {
// TODO: Idea about a primitive but almost free heuristic to not evict
// "recently used" chunks: Do not unpin the chunks right here, but hand
// over the pinnedChunkDescs to a manager that will delay the unpinning
// based on time and memory pressure.
for _, cd := range p.pinnedChunkDescs {
cd.unpin()
}
chunkOps.WithLabelValues(unpin).Add(float64(len(p.pinnedChunkDescs)))
}