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app/vmselect/prometheus: do not add __name__!= filter when searching for all the matching metric names via /api/v1/label/__name__/values with non-empty label filter

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This should reduce query time.
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/343
This commit is contained in:
Aliaksandr Valialkin 2020-02-28 23:35:47 +02:00
parent 6a1aab88fd
commit d23df53ba2
1 changed files with 11 additions and 9 deletions
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8
app/vmselect/prometheus/prometheus.go
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@ -340,17 +340,19 @@ func labelValuesWithMatches(at *auth.Token, labelName string, matches []string,
if err != nil {
return nil, false, err
}
// Add `labelName!=''` tag filter in order to filter out series without the labelName.
// There is no need in adding `__name__!=''` filter, since all the time series should
// already have non-empty name.
if labelName != "__name__" {
key := []byte(labelName)
if string(key) == "__name__" {
key = nil
}
for i, tfs := range tagFilterss {
tagFilterss[i] = append(tfs, storage.TagFilter{
Key: key,
IsNegative: true,
})
}
}
if start >= end {
end = start + defaultStep
}