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

["Kenneth Knowles (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-1589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kenneth Knowles updated BEAM-1589:
----------------------------------
    Resolution: Fixed
        Status: Resolved  (was: Resolved)

Hello! Due to a bug in our Jira configuration, this issue had status:Resolved but resolution:Unresolved.

I am bulk editing these issues to have resolution:Fixed

If a different resolution is appropriate, please change it. To do this, click the "Resolve" button (you can do this even for closed issues) and set the Resolution field to the right value.

> 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, Done, 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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