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d5c33877f9
* storage: Added Chunks{Queryable/Querier/SeriesSet/Series/Iteratable. Added generic Merge{SeriesSet/Querier} implementation.
## Rationales:
In many places (e.g. chunk Remote read, Thanos Receive fetching chunk from TSDB), we operate on encoded chunks not samples.
This means that we unnecessary decode/encode, wasting CPU, time and memory.
This PR adds chunk iterator interfaces and makes the merge code to be reused between both seriesSets
I will make the use of it in following PR inside tsdb itself. For now fanout implements it and mergers.
All merges now also allows passing series mergers. This opens doors for custom deduplications other than TSDB vertical ones (e.g. offline one we have in Thanos).
## Changes
* Added Chunk versions of all iterating methods. It all starts in Querier/ChunkQuerier. The plan is that
Storage will implement both chunked and samples.
* Added Seek to chunks.Iterator interface for iterating over chunks.
* NewMergeChunkQuerier was added; Both this and NewMergeQuerier are now using generigMergeQuerier to share the code. Generic code was added.
* Improved tests.
* Added some TODO for further simplifications in next PRs.
Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com>
* Addressed Brian's comments.
Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com>
* Moved s/Labeled/SeriesLabels as per Krasi suggestion.
Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com>
* Addressed Krasi's comments.
Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com>
* Second iteration of Krasi comments.
Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com>
* Another round of comments.
Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com>
85 lines
2.4 KiB
Go
85 lines
2.4 KiB
Go
// Copyright 2020 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 storage
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import (
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"math"
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"github.com/prometheus/prometheus/pkg/labels"
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"github.com/prometheus/prometheus/tsdb/chunkenc"
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"github.com/prometheus/prometheus/tsdb/chunks"
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"github.com/prometheus/prometheus/tsdb/tsdbutil"
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)
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type MockSeries struct {
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labels labels.Labels
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SampleIteratorFn func() chunkenc.Iterator
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}
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func NewListSeries(lset labels.Labels, samples []tsdbutil.Sample) *MockSeries {
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return &MockSeries{
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labels: lset,
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SampleIteratorFn: func() chunkenc.Iterator {
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return NewListSeriesIterator(samples)
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},
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}
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}
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func (s *MockSeries) Labels() labels.Labels { return s.labels }
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func (s *MockSeries) Iterator() chunkenc.Iterator { return s.SampleIteratorFn() }
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type MockChunkSeries struct {
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labels labels.Labels
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ChunkIteratorFn func() chunks.Iterator
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}
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func NewListChunkSeriesFromSamples(lset labels.Labels, samples ...[]tsdbutil.Sample) *MockChunkSeries {
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var chks []chunks.Meta
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return &MockChunkSeries{
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labels: lset,
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ChunkIteratorFn: func() chunks.Iterator {
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// Inefficient chunks encoding implementation, not caring about chunk size.
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for _, s := range samples {
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chks = append(chks, tsdbutil.ChunkFromSamples(s))
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}
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return NewListChunkSeriesIterator(chks...)
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},
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}
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}
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func (s *MockChunkSeries) Labels() labels.Labels { return s.labels }
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func (s *MockChunkSeries) Iterator() chunks.Iterator { return s.ChunkIteratorFn() }
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func ExpandSamples(iter chunkenc.Iterator) ([]tsdbutil.Sample, error) {
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var result []tsdbutil.Sample
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for iter.Next() {
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t, v := iter.At()
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// NaNs can't be compared normally, so substitute for another value.
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if math.IsNaN(v) {
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v = -42
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}
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result = append(result, sample{t, v})
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}
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return result, iter.Err()
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}
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func ExpandChunks(iter chunks.Iterator) ([]chunks.Meta, error) {
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var result []chunks.Meta
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for iter.Next() {
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result = append(result, iter.At())
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}
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return result, iter.Err()
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}
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