mirror of
https://github.com/prometheus/prometheus.git
synced 2024-09-20 07:47:31 -07:00
96d7f540d4
Change index persistence for series to not be accumulated in memory
before being written as one large batch. `Labels` and `ChunkMeta`
objects are reused.
This cuts down memory spikes during compaction of multiple blocks
significantly.
As part of the the Index{Reader,Writer} now have an explicit notion of
symbols and series must be inserted in order.
66 lines
1.6 KiB
Go
66 lines
1.6 KiB
Go
// Copyright 2017 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 chunks
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import "fmt"
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// Encoding is the identifier for a chunk encoding.
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type Encoding uint8
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func (e Encoding) String() string {
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switch e {
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case EncNone:
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return "none"
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case EncXOR:
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return "XOR"
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}
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return "<unknown>"
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}
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// The different available chunk encodings.
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const (
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EncNone Encoding = iota
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EncXOR
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)
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// Chunk holds a sequence of sample pairs that can be iterated over and appended to.
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type Chunk interface {
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Bytes() []byte
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Encoding() Encoding
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Appender() (Appender, error)
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Iterator() Iterator
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NumSamples() int
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}
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// FromData returns a chunk from a byte slice of chunk data.
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func FromData(e Encoding, d []byte) (Chunk, error) {
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switch e {
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case EncXOR:
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return &XORChunk{b: &bstream{count: 0, stream: d}}, nil
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}
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return nil, fmt.Errorf("unknown chunk encoding: %d", e)
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}
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// Appender adds sample pairs to a chunk.
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type Appender interface {
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Append(int64, float64)
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}
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// Iterator is a simple iterator that can only get the next value.
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type Iterator interface {
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At() (int64, float64)
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Err() error
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Next() bool
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}
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