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drainer: Add a metric to track the delay of the downstream #594

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merged 4 commits into from
May 23, 2019
Merged

drainer: Add a metric to track the delay of the downstream #594

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a11471c
Add a metric to track the delay of the downstream
suzaku May 9, 2019
1f88519
Use histogram instead
suzaku May 20, 2019
a34ba81
Use buckets suitable for drainer delay
suzaku May 23, 2019
5e24e9f
Merge branch 'master' into monitor-drainer-delay
july2993 May 23, 2019
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10 changes: 10 additions & 0 deletions drainer/metrics.go
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,15 @@ var (
Help: "save checkpoint tso of drainer.",
})

checkpointDelayHistogram = prometheus.NewHistogram(
prometheus.HistogramOpts{
Namespace: "binlog",
Subsystem: "drainer",
Name: "checkpoint_delay_seconds",
Help: "How much the downstream checkpoint lag behind",
Buckets: prometheus.ExponentialBuckets(0.001, 2, 22),
})

executeHistogram = prometheus.NewHistogram(
prometheus.HistogramOpts{
Namespace: "binlog",
Expand Down Expand Up @@ -123,6 +132,7 @@ func init() {
registry.MustRegister(ddlJobsCounter)
registry.MustRegister(errorCount)
registry.MustRegister(checkpointTSOGauge)
registry.MustRegister(checkpointDelayHistogram)
registry.MustRegister(eventCounter)
registry.MustRegister(executeHistogram)
registry.MustRegister(binlogReachDurationHistogram)
Expand Down
2 changes: 2 additions & 0 deletions drainer/syncer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -221,6 +221,8 @@ func (s *Syncer) handleSuccess(fakeBinlog chan *pb.Binlog, lastTS *int64) {
lastSaveTS = ts
eventCounter.WithLabelValues("savepoint").Add(1)
}
delay := oracle.GetPhysical(time.Now()) - oracle.ExtractPhysical(uint64(ts))
checkpointDelayHistogram.Observe(float64(delay) / 1e3)
}
}

Expand Down