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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>
This commit is contained in:
Roman Khavronenko 2024-01-17 13:48:06 +01:00 committed by GitHub
parent 5bdf62de5b
commit cf03e11d89
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4 changed files with 18 additions and 1 deletions
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1
app/victoria-metrics/testdata/prometheus/instant-matrix.json vendored
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@ -1,6 +1,5 @@
{
"name": "instant query with look-behind window",
"issue": "https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5553",
"data": ["[{\"labels\":[{\"name\":\"__name__\",\"value\":\"foo\"}],\"samples\":[{\"value\":1,\"timestamp\":\"{TIME_MS-60s}\"}]}]"],
"query": ["/api/v1/query?query=foo[5m]"],
"result_query": {

13
app/victoria-metrics/testdata/prometheus/issue-5553-too-big-lookback.json vendored Normal file
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@ -0,0 +1,13 @@
{
"name": "too big look-behind window",
"issue": "https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5553",
"data": ["[{\"labels\":[{\"name\":\"__name__\",\"value\":\"foo\"},{\"name\":\"issue\",\"value\":\"5553\"}],\"samples\":[{\"value\":1,\"timestamp\":\"{TIME_MS-60s}\"}]}]"],
"query": ["/api/v1/query?query=foo{issue=\"5553\"}[100y]"],
"result_query": {
"status": "success",
"data":{
"resultType":"matrix",
"result":[{"metric":{"__name__":"foo", "issue": "5553"},"values":[["{TIME_S-60s}", "1"]]}]
}
}
}

3
app/vmselect/prometheus/prometheus.go
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@ -718,6 +718,9 @@ func QueryHandler(qt *querytracer.Tracer, startTime time.Time, w http.ResponseWr
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
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@ -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)