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app/vmselect/promql: fix seriesFetched update logic (#7181)

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### Describe Your Changes

evalInstantRollup could have overreport the number of fetched series if
`offset` checks will result into retry. This change updates fetched
series only if these checks were successful.

It also adds a comment to another potential place of over-reporting
series fetched. It doesn't fix it, because it would require spending
extra resources on such a check, while discrepancy in seriesFetched
doesn't affect calculations in any way.

Probably related to
https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7170

### Checklist

The following checks are **mandatory**:

- [x] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).

Signed-off-by: hagen1778 <roman@victoriametrics.com>

(cherry picked from commit ebd393d8b3)
Signed-off-by: hagen1778 <roman@victoriametrics.com>
This commit is contained in:
Roman Khavronenko 2024-10-07 14:27:50 +02:00 committed by hagen1778
parent 2d4cde5506
commit f825a9de80
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GPG Key ID: 3BF75F3741CA9640
1 changed files with 5 additions and 1 deletions
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6
app/vmselect/promql/eval.go
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@ -1123,7 +1123,6 @@ func evalInstantRollup(qt *querytracer.Tracer, ec *EvalConfig, funcName string,
again: again:
offset := int64(0) offset := int64(0)
tssCached := rollupResultCacheV.GetInstantValues(qt, at, expr, window, ec.Step, ec.EnforcedTagFilterss) tssCached := rollupResultCacheV.GetInstantValues(qt, at, expr, window, ec.Step, ec.EnforcedTagFilterss)
ec.QueryStats.addSeriesFetched(len(tssCached))
if len(tssCached) == 0 { if len(tssCached) == 0 {
// Cache miss. Re-populate the missing data. // Cache miss. Re-populate the missing data.
start := int64(fasttime.UnixTimestamp()*1000) - cacheTimestampOffset.Milliseconds() start := int64(fasttime.UnixTimestamp()*1000) - cacheTimestampOffset.Milliseconds()
@ -1167,6 +1166,7 @@ func evalInstantRollup(qt *querytracer.Tracer, ec *EvalConfig, funcName string,
deleteCachedSeries(qt) deleteCachedSeries(qt)
goto again goto again
} }
ec.QueryStats.addSeriesFetched(len(tssCached))
return tssCached, offset, nil return tssCached, offset, nil
} }
@ -1678,6 +1678,10 @@ func evalRollupFuncWithMetricExpr(qt *querytracer.Tracer, ec *EvalConfig, funcNa
ecNew = copyEvalConfig(ec) ecNew = copyEvalConfig(ec)
ecNew.Start = start ecNew.Start = start
} }
// call to evalWithConfig also updates QueryStats.addSeriesFetched
// without checking whether tss has intersection with tssCached.
// So final number could be bigger than actual number of unique series.
// This discrepancy is acceptable, since seriesFetched stat is used as info only.
tss, err := evalWithConfig(ecNew) tss, err := evalWithConfig(ecNew)
if err != nil { if err != nil {
return nil, err return nil, err