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app/vmselect/promql: do not return data points in the end of the selected time range for time series ending in the middle of the selected time range

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Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/887
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/845
This commit is contained in:
Aliaksandr Valialkin 2020-11-10 14:51:13 +02:00
parent 6385432611
commit 8f3339fa81
2 changed files with 7 additions and 3 deletions
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7
app/vmselect/promql/rollup.go
View file

@ -507,7 +507,9 @@ func (rc *rollupConfig) doInternal(dstValues []float64, tsm *timeseriesMap, valu
ni := 0
nj := 0
stalenessInterval := int64(float64(scrapeInterval) * 0.9)
canDropLastSample := rc.CanDropLastSample
// Do not drop trailing data points for queries, which return 2 or 1 point (aka instant queries).
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/845
canDropLastSample := rc.CanDropLastSample && len(rc.Timestamps) > 2
for _, tEnd := range rc.Timestamps {
tStart := tEnd - window
ni = seekFirstTimestampIdxAfter(timestamps[i:], tStart, ni)
@ -526,13 +528,12 @@ func (rc *rollupConfig) doInternal(dstValues []float64, tsm *timeseriesMap, valu
}
rfa.values = values[i:j]
rfa.timestamps = timestamps[i:j]
if canDropLastSample && j == len(timestamps) && j > 0 && (tEnd-timestamps[j-1] > stalenessInterval || i == j && len(timestamps) == 1) && rc.End-tEnd >= 2*rc.Step {
if canDropLastSample && j == len(timestamps) && j > 0 && (tEnd-timestamps[j-1] > stalenessInterval || i == j && len(timestamps) == 1) {
// Drop trailing data points in the following cases:
// - if the distance between the last raw sample and tEnd exceeds stalenessInterval
// - if time series contains only a single raw sample
// This should prevent from double counting when a label changes in time series (for instance,
// during new deployment in K8S). See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/748
// Do not drop trailing data points for instant queries. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/845
rfa.prevValue = nan
rfa.values = nil
rfa.timestamps = nil

3
docs/CHANGELOG.md
View file

@ -6,6 +6,9 @@
See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/825#issuecomment-724308361 for details.
* FEATURE: vmalert: explicitly set extra labels to alert entities. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/870
* BUGFIX: do not return data points in the end of the selected time range for time series ending in the middle of the selected time range.
See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/887 and https://github.com/VictoriaMetrics/VictoriaMetrics/issues/845
# [v1.46.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.46.0)