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https://issues.apache.org/jira/browse/FLINK-9637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16561603#comment-16561603
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ASF GitHub Bot commented on FLINK-9637:
---------------------------------------
StefanRRichter commented on a change in pull request #6379: [FLINK-9637] Add
public user documentation for state TTL feature
URL: https://github.com/apache/flink/pull/6379#discussion_r206043626
##########
File path: docs/dev/stream/state/state.md
##########
@@ -266,6 +266,92 @@ a `ValueState`. Once the count reaches 2 it will emit the
average and clear the
we start over from `0`. Note that this would keep a different state value for
each different input
key if we had tuples with different values in the first field.
+### State time-to-live (TTL)
+
+A time-to-live (TTL) can be assigned to the keyed state value.
+In this case it will expire after the configured TTL
+and its stored value will be cleaned up based on the best effort.
+Depending on configuration, the expired state can become unavailable for read
access
+even if it is not cleaned up yet. In this case it behaves as if it does not
exist any more.
Review comment:
This is very abstract in isolation, maybe we should discuss this in the
context of the different visibility levels to make it more clear that this is
what we are talking about here?
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> Add public user documentation for TTL feature
> ---------------------------------------------
>
> Key: FLINK-9637
> URL: https://issues.apache.org/jira/browse/FLINK-9637
> Project: Flink
> Issue Type: Sub-task
> Components: State Backends, Checkpointing
> Affects Versions: 1.6.0
> Reporter: Andrey Zagrebin
> Assignee: Andrey Zagrebin
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.6.0
>
>
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