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Prometheus: Fix concurrency issue with exemplar sampler initialization (#61281)

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This commit is contained in:
Todd Treece 2023-01-11 08:27:47 -05:00 committed by GitHub
parent f2ffce4351
commit 19ca93d5ce
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 7 additions and 7 deletions
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6
pkg/tsdb/prometheus/querydata/request.go
View File

@ -43,7 +43,7 @@ type QueryData struct {
URL string
TimeInterval string
enableWideSeries bool
exemplarSampler exemplar.Sampler
exemplarSampler func() exemplar.Sampler
}
func New(
@ -67,10 +67,10 @@ func New(
promClient := client.NewClient(httpClient, httpMethod, settings.URL)
// standard deviation sampler is the default for backwards compatibility
exemplarSampler := exemplar.NewStandardDeviationSampler()
exemplarSampler := exemplar.NewStandardDeviationSampler
if features.IsEnabled(featuremgmt.FlagDisablePrometheusExemplarSampling) {
exemplarSampler = exemplar.NewNoOpSampler()
exemplarSampler = exemplar.NewNoOpSampler
}
return &QueryData{

8
pkg/tsdb/prometheus/querydata/response.go
View File

@ -47,14 +47,14 @@ func (s *QueryData) parseResponse(ctx context.Context, q *models.Query, res *htt
}
func (s *QueryData) processExemplars(q *models.Query, dr *backend.DataResponse) *backend.DataResponse {
s.exemplarSampler.Reset()
sampler := s.exemplarSampler()
labelTracker := exemplar.NewLabelTracker()
// we are moving from a multi-frame response returned
// by the converter to a single exemplar frame,
// so we need to build a new frame array with the
// old exemplar frames filtered out
framer := exemplar.NewFramer(s.exemplarSampler, labelTracker)
framer := exemplar.NewFramer(sampler, labelTracker)
for _, frame := range dr.Frames {
// we don't need to process non-exemplar frames
@ -69,7 +69,7 @@ func (s *QueryData) processExemplars(q *models.Query, dr *backend.DataResponse)
framer.SetRefID(frame.RefID)
step := time.Duration(frame.Fields[0].Config.Interval) * time.Millisecond
s.exemplarSampler.SetStep(step)
sampler.SetStep(step)
seriesLabels := getSeriesLabels(frame)
labelTracker.Add(seriesLabels)
@ -83,7 +83,7 @@ func (s *QueryData) processExemplars(q *models.Query, dr *backend.DataResponse)
Timestamp: row[0].(time.Time),
SeriesLabels: seriesLabels,
}
s.exemplarSampler.Add(ex)
sampler.Add(ex)
}
}