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https://issues.apache.org/jira/browse/FLINK-9637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16561604#comment-16561604
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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_r206044982
##########
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.
Review comment:
I was expecting some additional info about what "best effort" means here,
but it came a bit later. Maybe we should say that this is discussed in more
detail later. I think it might also make sense to name some use cases that are
currently supported (and some that are not/will be in the future) to make
things a bit more concrete for users.
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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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