Myasuka commented on a change in pull request #16177:
URL: https://github.com/apache/flink/pull/16177#discussion_r662161364
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File path: docs/content.zh/docs/dev/datastream/fault-tolerance/state.md
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@@ -561,6 +561,17 @@ val counts: DataStream[(String, Int)] = stream
})
```
+### 跟踪 keyed state 的访问延迟
+
+Flink also allows to track the keyed state access latency for all
state-backends. This feature is disabled by default.
+To enable this feature you must set the
`state.backend.latency-track.keyed-state-enabled` as true in the [Flink
configuration]({{< ref "docs/deployment/config"
>}}#state-backends-latency-tracking-options).
+
+Once tracking keyed state access latency is enabled, Flink will sample the
state access latency every `N` access, in which `N` is defined by
`state.backend.latency-track.sample-interval`.
+This configuration has the default value as 128, and a smaller value will get
more accurate result but higher performance impact as sampled more frequently.
+
+As the type of this latency metrics is histogram,
`state.backend.latency-track.history-size` will control the maximum number of
recorded values in history, which has the default value as 128.
+A larger value of this configuration will occupy more memory footprint, but
getting a more accurate result.
Review comment:
Thanks for your suggestions, and I have moved all descriptions to
`ops/metrics.md`
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