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https://issues.apache.org/jira/browse/BEAM-1589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17160498#comment-17160498
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Beam JIRA Bot commented on BEAM-1589:
-------------------------------------
This issue was marked "stale-assigned" and has not received a public comment in
7 days. It is now automatically unassigned. If you are still working on it, you
can assign it to yourself again. Please also give an update about the status of
the work.
> Add OnWindowExpiration method to Stateful DoFn
> ----------------------------------------------
>
> Key: BEAM-1589
> URL: https://issues.apache.org/jira/browse/BEAM-1589
> Project: Beam
> Issue Type: New Feature
> Components: runner-core, sdk-java-core
> Reporter: Jingsong Lee
> Priority: P2
> Time Spent: 13h 40m
> Remaining Estimate: 0h
>
> See BEAM-1517
> This allows the user to do some work before the state's garbage collection.
> It seems kind of annoying, but on the other hand forgetting to set a final
> timer to flush state is probably data loss most of the time.
> FlinkRunner does this work very simply, but other runners, such as
> DirectRunner, need to traverse all the states to do this, and maybe it's a
> little hard.
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