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backend: add prometheus metric for large snapshot duration. #7892

Merged
merged 1 commit into from
May 8, 2017
Merged

backend: add prometheus metric for large snapshot duration. #7892

merged 1 commit into from
May 8, 2017

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fanminshi
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FIXES #7878

@fanminshi fanminshi added the WIP label May 6, 2017
@fanminshi fanminshi force-pushed the add_snashot_duration_metric branch from c01e297 to 94054a4 Compare May 6, 2017 00:06
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fanminshi commented May 6, 2017 •
edited

I manually create 2 snapshots which take 10 seconds each.

I saw following metrics:

etcd_disk_backend_snapshot_duration_seconds_bucket{le="1"} 0
etcd_disk_backend_snapshot_duration_seconds_bucket{le="2"} 0
etcd_disk_backend_snapshot_duration_seconds_bucket{le="4"} 0
etcd_disk_backend_snapshot_duration_seconds_bucket{le="8"} 0
etcd_disk_backend_snapshot_duration_seconds_bucket{le="16"} 2
etcd_disk_backend_snapshot_duration_seconds_bucket{le="32"} 2
etcd_disk_backend_snapshot_duration_seconds_bucket{le="64"} 2
etcd_disk_backend_snapshot_duration_seconds_bucket{le="128"} 2
etcd_disk_backend_snapshot_duration_seconds_bucket{le="256"} 2
etcd_disk_backend_snapshot_duration_seconds_bucket{le="512"} 2
etcd_disk_backend_snapshot_duration_seconds_bucket{le="+Inf"} 2
etcd_disk_backend_snapshot_duration_seconds_sum 20.001328967
etcd_disk_backend_snapshot_duration_seconds_count 2

I am unsure why buckets 32-512 also have counts 2.

EDIT: le might stands for <= which makes sense for the metric output.

@fanminshi fanminshi force-pushed the add_snashot_duration_metric branch from 94054a4 to 6b5272e Compare May 6, 2017 00:10
heyitsanthony
heyitsanthony reviewed May 6, 2017
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mvcc/backend/metrics.go Outdated
@@ -24,8 +24,18 @@ var (
Help: "The latency distributions of commit called by backend.",
Buckets: prometheus.ExponentialBuckets(0.001, 2, 14),
})

snapShotDurations = prometheus.NewHistogram(prometheus.HistogramOpts{
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snapshotDurations

mvcc/backend/metrics.go Outdated
Name: "backend_snapshot_duration_seconds",
Help: "The latency distributions of Snapshot called by backend.",
// 1 second -> 1024 seconds
Buckets: prometheus.ExponentialBuckets(1, 2, 10),
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1024 seconds is extreme, probably want to capture something like [10ms -- 30s]

mvcc/backend/metrics.go Outdated
Namespace: "etcd",
Subsystem: "disk",
Name: "backend_snapshot_duration_seconds",
Help: "The latency distributions of Snapshot called by backend.",
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The latency distribution of backend snapshots.

mvcc/backend/metrics.go Outdated
Name: "backend_snapshot_duration_seconds",
Help: "The latency distributions of Snapshot called by backend.",
// 1 second -> 512 seconds
Buckets: prometheus.ExponentialBuckets(1, 2, 10),
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probably want something like 10ms -- 1minute. 512 seconds is a lot

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@fanminshi fanminshi May 6, 2017 •
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@xiang90 suggested to track large snapshot duration fro 1 second to around 10 min.

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ok...

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we can track low numbers that are common cases. when cluster starts to suffer we probably want to track large numbers. if the snap is 8gb with slow network 100s seconds is possible

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@fanminshi fanminshi May 6, 2017 •
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okay, should we do 10ms to 10mins?

edit: 10ms

@fanminshi fanminshi force-pushed the add_snashot_duration_metric branch from 6b5272e to 42d2cc8 Compare May 6, 2017 00:16
@fanminshi fanminshi force-pushed the add_snashot_duration_metric branch from 42d2cc8 to 230106d Compare May 6, 2017 00:27
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@xiang90 @heyitsanthony.

How about 10ms to 10 mins?

@fanminshi fanminshi merged commit 2655540 into etcd-io:master May 8, 2017
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@gyuho I didn't find this one in CHANGELOG-3.2.md, it is merged in 3.2 right? Just want to confirm, I can add in the changelog and backport to 3.1 if it's safe.

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gyuho commented Jul 20, 2018

@wenjiaswe Yeah, it's in 3.2 not in 3.1 Let's backport and update changelog.

wenjiaswe added a commit to wenjiaswe/etcd that referenced this pull request Jul 20, 2018
@wenjiaswe
CHANGELOG-3.2: update from etcd-io#7892
882a601
wenjiaswe added a commit to wenjiaswe/etcd that referenced this pull request Jul 20, 2018
@wenjiaswe
CHANGELOG-3.2: update from etcd-io#7892
82b712a
@wenjiaswe wenjiaswe mentioned this pull request Jul 20, 2018
Merged
wenjiaswe added a commit to wenjiaswe/etcd that referenced this pull request Jul 24, 2018
@wenjiaswe
CHANGELOG-3.2: update from etcd-io#7892
7b71022
gyuho added a commit that referenced this pull request Jul 24, 2018
@gyuho
Merge pull request #9948 from wenjiaswe/changelog47892
69ae028 
CHANGELOG-3.2: update from #7892
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