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app/vmselect/prometheus: prevent from fetching and scanning all the data on /api/v1/searies call by default

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This commit is contained in:
Aliaksandr Valialkin 2019-08-04 19:42:36 +03:00
parent 1c69f4eadc
commit 241170dc05
1 changed files with 7 additions and 4 deletions
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11
app/vmselect/prometheus/prometheus.go
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@ -309,13 +309,16 @@ func SeriesHandler(w http.ResponseWriter, r *http.Request) error {
if len(matches) == 0 {
return fmt.Errorf("missing `match[]` arg")
}
// Set start to minTimeMsecs by default as Prometheus does.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/91
start, err := getTime(r, "start", minTimeMsecs)
end, err := getTime(r, "end", ct)
if err != nil {
return err
}
end, err := getTime(r, "end", ct)
// Do not set start to minTimeMsecs by default as Prometheus does,
// since this leads to fetching and scanning all the data from the storage,
// which can take a lot of time for big storages.
// It is better setting start as end-defaultStep by default.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/91
start, err := getTime(r, "start", end-defaultStep)
if err != nil {
return err
}