mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-11 20:21:15 +01:00
94 lines
2.5 KiB
Go
94 lines
2.5 KiB
Go
package storage
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import (
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"time"
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)
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// SetMinScrapeIntervalForDeduplication sets the minimum interval for data points during de-duplication.
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//
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// De-duplication is disabled if interval is 0.
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//
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// This function must be called before initializing the storage.
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func SetMinScrapeIntervalForDeduplication(interval time.Duration) {
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minScrapeInterval = interval.Milliseconds()
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}
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var minScrapeInterval = int64(0)
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// DeduplicateSamples removes samples from src* if they are closer to each other than minScrapeInterval.
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func DeduplicateSamples(srcTimestamps []int64, srcValues []float64) ([]int64, []float64) {
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if minScrapeInterval <= 0 {
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return srcTimestamps, srcValues
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}
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if !needsDedup(srcTimestamps, minScrapeInterval) {
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// Fast path - nothing to deduplicate
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return srcTimestamps, srcValues
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}
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// Slow path - dedup data points.
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tsNext := (srcTimestamps[0] - srcTimestamps[0]%minScrapeInterval) + minScrapeInterval
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dstTimestamps := srcTimestamps[:1]
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dstValues := srcValues[:1]
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for i := 1; i < len(srcTimestamps); i++ {
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ts := srcTimestamps[i]
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if ts < tsNext {
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continue
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}
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dstTimestamps = append(dstTimestamps, ts)
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dstValues = append(dstValues, srcValues[i])
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// Update tsNext
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tsNext += minScrapeInterval
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if ts >= tsNext {
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// Slow path for updating ts.
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tsNext = (ts - ts%minScrapeInterval) + minScrapeInterval
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}
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}
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return dstTimestamps, dstValues
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}
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func deduplicateSamplesDuringMerge(srcTimestamps, srcValues []int64) ([]int64, []int64) {
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if minScrapeInterval <= 0 {
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return srcTimestamps, srcValues
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}
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if !needsDedup(srcTimestamps, minScrapeInterval) {
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// Fast path - nothing to deduplicate
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return srcTimestamps, srcValues
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}
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// Slow path - dedup data points.
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tsNext := (srcTimestamps[0] - srcTimestamps[0]%minScrapeInterval) + minScrapeInterval
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dstTimestamps := srcTimestamps[:1]
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dstValues := srcValues[:1]
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for i := 1; i < len(srcTimestamps); i++ {
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ts := srcTimestamps[i]
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if ts < tsNext {
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continue
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}
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dstTimestamps = append(dstTimestamps, ts)
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dstValues = append(dstValues, srcValues[i])
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// Update tsNext
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tsNext += minScrapeInterval
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if ts >= tsNext {
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// Slow path for updating ts.
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tsNext = (ts - ts%minScrapeInterval) + minScrapeInterval
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}
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}
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return dstTimestamps, dstValues
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}
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func needsDedup(timestamps []int64, minDelta int64) bool {
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if len(timestamps) == 0 {
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return false
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}
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prevTimestamp := timestamps[0]
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for _, ts := range timestamps[1:] {
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if ts-prevTimestamp < minDelta {
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return true
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}
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prevTimestamp = ts
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}
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return false
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}
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