[jira] [Commented] (BEAM-1589) Add OnWindowExpiration method to Stateful DoFn

["Beam JIRA Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-1589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17231666#comment-17231666 ] 

Beam JIRA Bot commented on BEAM-1589:
-------------------------------------

This issue is assigned but has not received an update in 30 days so it has been labeled "stale-assigned". If you are still working on the issue, please give an update and remove the label. If you are no longer working on the issue, please unassign so someone else may work on it. In 7 days the issue will be automatically unassigned.

> 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: Reuven Lax
>            Priority: P2
>              Labels: Clarified, stale-P2, stale-assigned
>          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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