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From "Aljoscha Krettek (JIRA)" <>
Subject [jira] [Commented] (BEAM-1589) Add OnWindowExpiration method to Stateful DoFn
Date Fri, 03 Mar 2017 11:12:45 GMT


Aljoscha Krettek commented on BEAM-1589:

This will probably take the form of a {{@OnWindowExpiration}} annotation. I'm guessing from
some of his earlier comments elsewhere that [~kenn] already has an opinion about how this
could be done, right?

> Add OnWindowExpiration method to Stateful DoFn
> ----------------------------------------------
>                 Key: BEAM-1589
>                 URL:
>             Project: Beam
>          Issue Type: New Feature
>          Components: runner-core, sdk-java-core
>            Reporter: Jingsong Lee
> 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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