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app/vmselect/promql: pre-allocate memory for map for checking for duplicate timeseries

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This should reduce memory allocations for big number of timeseries
This commit is contained in:
Aliaksandr Valialkin 2019-08-20 22:51:45 +03:00
parent 0dfc1ace53
commit a0d480fbf3
1 changed files with 3 additions and 3 deletions
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6
app/vmselect/promql/exec.go
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@ -105,14 +105,14 @@ func maySortResults(e expr, tss []*timeseries) bool {
func timeseriesToResult(tss []*timeseries, maySort bool) ([]netstorage.Result, error) {
tss = removeNaNs(tss)
result := make([]netstorage.Result, len(tss))
m := make(map[string]bool)
m := make(map[string]struct{}, len(tss))
bb := bbPool.Get()
for i, ts := range tss {
bb.B = marshalMetricNameSorted(bb.B[:0], &ts.MetricName)
if m[string(bb.B)] {
if _, ok := m[string(bb.B)]; ok {
return nil, fmt.Errorf(`duplicate output timeseries: %s%s`, ts.MetricName.MetricGroup, stringMetricName(&ts.MetricName))
}
m[string(bb.B)] = true
m[string(bb.B)] = struct{}{}
rs := &result[i]
rs.MetricNameMarshaled = append(rs.MetricNameMarshaled[:0], bb.B...)