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app/vmselect: properly calculate start param for queries with too big look-behind window (#5630)

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Properly determine time range search for instant queries with too big look-behind window like `foo[100y]`.
 Previously, such queries could return empty responses even if `foo` is present in database.

https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5553

Signed-off-by: hagen1778 <roman@victoriametrics.com>
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Roman Khavronenko 2024-01-17 13:48:06 +01:00 committed by Aliaksandr Valialkin
parent 41d6c8a7dd
commit 148e14b3f2
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3
app/vmselect/prometheus/prometheus.go
View file

@ -813,6 +813,9 @@ func QueryHandler(qt *querytracer.Tracer, startTime time.Time, at *auth.Token, w
start -= offset
end := start
start = end - window
if start < 0 {
start = 0
}
// Do not include data point with a timestamp matching the lower boundary of the window as Prometheus does.
start++
if end < start {

2
docs/CHANGELOG.md
View file

@ -63,6 +63,8 @@ The sandbox cluster installation is running under the constant load generated by
* BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): exit if there is config syntax error in [`scrape_config_files`](https://docs.victoriametrics.com/vmagent.html#loading-scrape-configs-from-multiple-files) when `-promscrape.config.strictParse=true`. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5508).
* BUGFIX: [vmui](https://docs.victoriametrics.com/#vmui): fix a link for the statistic inaccuracy explanation in the cardinality explorer tool. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5460).
* BUGFIX: all: fix potential panic during components shutdown when [metrics push](https://docs.victoriametrics.com/#push-metrics) is configured. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5548). Thanks to @zhdd99 for the [pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5549).
* BUGFIX: [vmselect](https://docs.victoriametrics.com/vmselect.html): properly determine time range search for instant queries with too big look-behind window like `foo[100y]`. Previously, such queries could return empty responses even if `foo` is present in database.
## [v1.96.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.96.0)