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https://issues.apache.org/jira/browse/BEAM-1589?focusedWorklogId=436062&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-436062
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ASF GitHub Bot logged work on BEAM-1589:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 21/May/20 15:48
            Start Date: 21/May/20 15:48
    Worklog Time Spent: 10m 
      Work Description: reuvenlax merged pull request #11774:
URL: https://github.com/apache/beam/pull/11774


   


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 436062)
    Time Spent: 13h 40m  (was: 13.5h)

> 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
>            Assignee: Rehman Murad Ali
>            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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