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https://issues.apache.org/jira/browse/BEAM-1589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16863193#comment-16863193
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Steve Niemitz commented on BEAM-1589:
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ah interesting, thanks for the explanation! I was looking into this again
because I wanted to get rid of our user-land end-of-window timer, but it sounds
like that'll be required for some time now.
I wonder if it's worth just removing the annotation for now? It's pretty
confusing having it there but it not doing anything.
> 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: Major
> Time Spent: 1h 20m
> 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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