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https://issues.apache.org/jira/browse/BEAM-1517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15887857#comment-15887857
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ASF GitHub Bot commented on BEAM-1517:
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GitHub user JingsongLi opened a pull request:
https://github.com/apache/beam/pull/2127
[BEAM-1517] Garbage collect user state in Flink Runner
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---
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/JingsongLi/beam BEAM-1517
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/beam/pull/2127.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2127
----
commit 54fa85722b4c6e572eeba9dcd07539f731c0154b
Author: JingsongLi <[email protected]>
Date: 2017-02-28T08:08:38Z
[BEAM-1517] Garbage collect user state in Flink Runner
----
> Garbage collect user state in Flink Runner
> ------------------------------------------
>
> Key: BEAM-1517
> URL: https://issues.apache.org/jira/browse/BEAM-1517
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
>
> User facing state/timers in Beam are bound to the key/window of the data.
> Right now, the Flink Runner does not clean up user state when the watermark
> passes the GC horizon for the state associated with a given window.
> Neither {{StateInternals}} nor the Flink state API support discarding state
> for a whole namespace (which is the window in this case) so we might have to
> manually set a GC timer for each window/key combination, as is done in the
> {{ReduceFnRunner}}. For this we have to know all states a user can possibly
> use, which we can get from the {{DoFn}} signature.
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