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Posted to issues@flink.apache.org by "Yun Gao (Jira)" <ji...@apache.org> on 2022/11/03 08:00:06 UTC

[jira] [Commented] (FLINK-28469) Setting a timer within broadcast applyToKeyedState()

    [ https://issues.apache.org/jira/browse/FLINK-28469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17628176#comment-17628176 ] 

Yun Gao commented on FLINK-28469:
---------------------------------

Hi [~Sandys-Lumsdaine]  logically it is a bit hard to achieve that since the timer service relies on the a global current key, but applyToKey does not modify the current key. May I have a double confirmation of why you need this functionality?

> Setting a timer within broadcast applyToKeyedState()
> ----------------------------------------------------
>
>                 Key: FLINK-28469
>                 URL: https://issues.apache.org/jira/browse/FLINK-28469
>             Project: Flink
>          Issue Type: Improvement
>          Components: API / DataStream
>    Affects Versions: 1.16.0
>            Reporter: James
>            Priority: Minor
>
> I know we can’t set a timer in the processBroadcastElement() of the KeyedBroadcastProcessFunction as there is no key.
>  
> However, there is a context.applyToKeyedState() method which allows us to iterate over the keyed state in the scope of a key. So it is possible to add access to the TimerService onto the Context parameter passed into that delegate?
>  
> Since the code running in the applyToKeyedState() method is scoped to a key we should be able to set up timers for that key too.



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