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d742edfe0d
Large delta values often imply a difference between a large base value and the large delta value, potentially resulting in small numbers with a huge precision error. Since large delta values need 8 bytes anyway, we are not even saving memory. As a solution, always save the absoluto value rather than a delta once 8 bytes would be needed for the delta. Timestamps are then saved as 8 byte integers, while values are always saved as float64 in that case. Change-Id: I01100d600515e16df58ce508b50982ffd762cc49
68 lines
1.4 KiB
Go
68 lines
1.4 KiB
Go
package storage_ng
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import (
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"io"
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clientmodel "github.com/prometheus/client_golang/model"
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"github.com/prometheus/prometheus/storage/metric"
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)
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type chunks []chunk
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type chunk interface {
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add(*metric.SamplePair) chunks
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clone() chunk
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firstTime() clientmodel.Timestamp
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lastTime() clientmodel.Timestamp
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newIterator() chunkIterator
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marshal(io.Writer) error
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unmarshal(io.Reader) error
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close()
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// TODO: remove?
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values() <-chan *metric.SamplePair
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}
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type chunkIterator interface {
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getValueAtTime(clientmodel.Timestamp) metric.Values
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getBoundaryValues(metric.Interval) metric.Values
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getRangeValues(metric.Interval) metric.Values
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contains(clientmodel.Timestamp) bool
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}
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func transcodeAndAdd(dst chunk, src chunk, s *metric.SamplePair) chunks {
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numTranscodes.Inc()
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defer src.close()
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head := dst
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body := chunks{}
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for v := range src.values() {
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newChunks := head.add(v)
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body = append(body, newChunks[:len(newChunks)-1]...)
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head = newChunks[len(newChunks)-1]
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}
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newChunks := head.add(s)
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body = append(body, newChunks[:len(newChunks)-1]...)
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head = newChunks[len(newChunks)-1]
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return append(body, head)
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}
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func chunkType(c chunk) byte {
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switch c.(type) {
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case *deltaEncodedChunk:
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return 0
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default:
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panic("unknown chunk type")
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}
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}
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func chunkForType(chunkType byte) chunk {
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switch chunkType {
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case 0:
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return newDeltaEncodedChunk(d1, d0, true)
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default:
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panic("unknown chunk type")
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}
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}
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