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app/vmselect/promql: independently track offset hints for tStart and tEnd

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This should improve performance if timeseries starts or ends on the selected time range
This commit is contained in:
Aliaksandr Valialkin 2019-08-19 13:39:12 +03:00
parent 6ae4b4190f
commit 940349ccb9
1 changed files with 6 additions and 5 deletions
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11
app/vmselect/promql/rollup.go
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@ -197,16 +197,17 @@ func (rc *rollupConfig) Do(dstValues []float64, values []float64, timestamps []i
i := 0
j := 0
n := 0
ni := 0
nj := 0
for _, tEnd := range rc.Timestamps {
tStart := tEnd - window
n = seekFirstTimestampIdxAfter(timestamps[i:], tStart, n)
i += n
ni = seekFirstTimestampIdxAfter(timestamps[i:], tStart, ni)
i += ni
if j < i {
j = i
}
n = seekFirstTimestampIdxAfter(timestamps[j:], tEnd, n)
j += n
nj = seekFirstTimestampIdxAfter(timestamps[j:], tEnd, nj)
j += nj
rfa.prevValue = nan
rfa.prevTimestamp = tStart - maxPrevInterval