Shehzaad Nakhoda reassigned BEAM-1589:

    Assignee: Shehzaad Nakhoda

> 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: Shehzaad Nakhoda
>            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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