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vmalert: protect executor's field from concurrent access (#2387)

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Executor recently gain field for storing previously sent series.
Since the same executor object can be used in multiple goroutines,
the access to this field should be serialized.

Signed-off-by: hagen1778 <roman@victoriametrics.com>
This commit is contained in:
Roman Khavronenko 2022-03-30 12:37:27 +02:00 committed by GitHub
parent 0989649ad0
commit 1354e6d712
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 1 deletions
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5
app/vmalert/group.go
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@ -339,6 +339,7 @@ type executor struct {
notifiers func() []notifier.Notifier
rw *remotewrite.Client
previouslySentSeriesToRWMu sync.Mutex
// previouslySentSeriesToRW stores series sent to RW on previous iteration
// map[ruleID]map[ruleLabels][]prompb.Label
// where `ruleID` is ID of the Rule within a Group
@ -430,7 +431,7 @@ func (e *executor) exec(ctx context.Context, rule Rule, ts time.Time, resolveDur
// getStaledSeries checks whether there are stale series from previously sent ones.
func (e *executor) getStaleSeries(rule Rule, tss []prompbmarshal.TimeSeries, timestamp time.Time) []prompbmarshal.TimeSeries {
ruleLabels := make(map[string][]prompbmarshal.Label)
ruleLabels := make(map[string][]prompbmarshal.Label, len(tss))
for _, ts := range tss {
// convert labels to strings so we can compare with previously sent series
key := labelsToString(ts.Labels)
@ -440,6 +441,7 @@ func (e *executor) getStaleSeries(rule Rule, tss []prompbmarshal.TimeSeries, tim
rID := rule.ID()
var staleS []prompbmarshal.TimeSeries
// check whether there are series which disappeared and need to be marked as stale
e.previouslySentSeriesToRWMu.Lock()
for key, labels := range e.previouslySentSeriesToRW[rID] {
if _, ok := ruleLabels[key]; ok {
continue
@ -450,6 +452,7 @@ func (e *executor) getStaleSeries(rule Rule, tss []prompbmarshal.TimeSeries, tim
}
// set previous series to current
e.previouslySentSeriesToRW[rID] = ruleLabels
e.previouslySentSeriesToRWMu.Unlock()
return staleS
}