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lib/storage: try potentially faster tag filters at first, then apply slower tag filters

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The fastest tag filters are non-negative non-regexp, since they are the most specific.
The slowest tag filters are negative regexp, since they require scanning
all the entries for the given label.
This commit is contained in:
Aliaksandr Valialkin 2019-11-05 12:57:45 +02:00
parent a72b22a8b1
commit d2f688c550
1 changed files with 16 additions and 1 deletions
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17
lib/storage/index_db.go
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@ -1561,7 +1561,22 @@ func (is *indexSearch) searchMetricIDs(tfss []*TagFilters, tr TimeRange, maxMetr
func (is *indexSearch) updateMetricIDsForTagFilters(metricIDs *uint64set.Set, tfs *TagFilters, tr TimeRange, maxMetrics int) error {
// Sort tag filters for faster ts.Seek below.
sort.Slice(tfs.tfs, func(i, j int) bool { return bytes.Compare(tfs.tfs[i].prefix, tfs.tfs[j].prefix) < 0 })
sort.Slice(tfs.tfs, func(i, j int) bool {
// Move regexp and negative filters to the end, since they require scanning
// all the entries for the given label.
a := &tfs.tfs[i]
b := &tfs.tfs[j]
if a.isRegexp != b.isRegexp {
return !a.isRegexp
}
if a.isNegative != b.isNegative {
return !a.isNegative
}
if len(a.orSuffixes) != len(b.orSuffixes) {
return len(a.orSuffixes) < len(b.orSuffixes)
}
return bytes.Compare(a.prefix, b.prefix) < 0
})
minTf, minMetricIDs, err := is.getTagFilterWithMinMetricIDsCountOptimized(tfs, tr, maxMetrics)
if err != nil {