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lib/storage: speed up time series search for queries with multiple filters

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Use optimized specialized binary search for uint64 metricIDs instead of generic sort.Search.
This commit is contained in:
Aliaksandr Valialkin 2019-11-21 18:31:44 +02:00
parent 926290d73e
commit 33d9d63393
1 changed files with 15 additions and 3 deletions
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18
lib/storage/index_db.go
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@ -1967,9 +1967,7 @@ func (is *indexSearch) updateMetricIDsForOrSuffixWithFilter(prefix []byte, metri
break
}
if metricID > sf[0] {
n := sort.Search(len(sf), func(i int) bool {
return i >= 0 && i < len(sf) && sf[i] >= metricID
})
n := uint64BinarySearch(sf, metricID)
sf = sf[n:]
if len(sf) == 0 {
break
@ -1992,6 +1990,20 @@ func (is *indexSearch) updateMetricIDsForOrSuffixWithFilter(prefix []byte, metri
return nil
}
func uint64BinarySearch(a []uint64, v uint64) uint {
// Copy-pasted sort.Search from https://golang.org/src/sort/search.go?s=2246:2286#L49
i, j := uint(0), uint(len(a))
for i < j {
h := (i + j) >> 1
if h < uint(len(a)) && a[h] < v {
i = h + 1
} else {
j = h
}
}
return i
}
var errFallbackToMetricNameMatch = errors.New("fall back to updateMetricIDsByMetricNameMatch because of too many index scan loops")
var errMissingMetricIDsForDate = errors.New("missing metricIDs for date")