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storage: skip merging when no remote storage configured

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Prometheus is hard-coded to use a fanout storage between TSDB and
a remote storage which by default is empty.
This change detects the empty storage and skips merging between
result sets, which would make `Select()` sort results.

Bottom line: we skip a sort unless there really is some remote storage
configured.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2024-01-18 17:42:18 +00:00
parent 102fd8cc88
commit 63cdd6dbe1
2 changed files with 6 additions and 1 deletions
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4
storage/fanout.go
View File

@ -89,7 +89,9 @@ func (f *fanout) Querier(mint, maxt int64) (Querier, error) {
}
return nil, errs.Err()
}
secondaries = append(secondaries, querier)
if _, ok := querier.(noopQuerier); !ok {
secondaries = append(secondaries, querier)
}
}
return NewMergeQuerier([]Querier{primary}, secondaries, ChainedSeriesMerge), nil
}

3
storage/merge.go
View File

@ -46,6 +46,9 @@ type mergeGenericQuerier struct {
//
// In case of overlaps between the data given by primaries' and secondaries' Selects, merge function will be used.
func NewMergeQuerier(primaries, secondaries []Querier, mergeFn VerticalSeriesMergeFunc) Querier {
if len(primaries)+len(secondaries) == 0 {
return NoopQuerier()
}
queriers := make([]genericQuerier, 0, len(primaries)+len(secondaries))
for _, q := range primaries {
if _, ok := q.(noopQuerier); !ok && q != nil {