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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9637) Add public user documentation for TTL feature
Date Mon, 30 Jul 2018 08:09:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16561603#comment-16561603
] 

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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