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wal: use Histogram for syncDuration

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This commit is contained in:
Xiang Li 2015-10-17 12:25:26 -07:00
parent fd07e02604
commit 1c7f52d931
3 changed files with 9 additions and 8 deletions
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10
Documentation/metrics.md
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@ -32,12 +32,12 @@ Failed proposals (`proposal_failed_total`) are normally related to two issues: t
### wal
| Name | Description | Type |
|------------------------------------|--------------------------------------------------|---------|
| fsync_durations_microseconds | The latency distributions of fsync called by wal | Summary |
| last_index_saved | The index of the last entry saved by wal | Gauge |
| Name | Description | Type |
|------------------------------------|--------------------------------------------------|-----------|
| fsync_durations_seconds | The latency distributions of fsync called by wal | Histogram |
| last_index_saved | The index of the last entry saved by wal | Gauge |
Abnormally high fsync duration (`fsync_durations_microseconds`) indicates disk issues and might cause the cluster to be unstable.
Abnormally high fsync duration (`fsync_durations_seconds`) indicates disk issues and might cause the cluster to be unstable.
### http requests

5
wal/metrics.go
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@ -17,11 +17,12 @@ package wal
import "github.com/coreos/etcd/Godeps/_workspace/src/github.com/prometheus/client_golang/prometheus"
var (
syncDurations = prometheus.NewSummary(prometheus.SummaryOpts{
syncDurations = prometheus.NewHistogram(prometheus.HistogramOpts{
Namespace: "etcd",
Subsystem: "wal",
Name: "fsync_durations_microseconds",
Name: "fsync_durations_seconds",
Help: "The latency distributions of fsync called by wal.",
Buckets: prometheus.ExponentialBuckets(0.001, 2, 14),
})
lastIndexSaved = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "etcd",

2
wal/wal.go
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@ -403,7 +403,7 @@ func (w *WAL) sync() error {
}
start := time.Now()
err := w.f.Sync()
syncDurations.Observe(float64(time.Since(start).Nanoseconds() / int64(time.Microsecond)))
syncDurations.Observe(float64(time.Since(start)) / float64(time.Second))
return err
}