[jira] [Commented] (FLINK-5363) Fire timers when window state is currently empty

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-5363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16511015#comment-16511015 ] 

ASF GitHub Bot commented on FLINK-5363:
---------------------------------------

Github user cjolif commented on the issue:

    https://github.com/apache/flink/pull/3034
  
    > It could, but I think we don't want to do this change right now.
    
    we are getting into cases where this feature would be useful. Do you have any insights on why you finally don't want to make this feasible?


> Fire timers when window state is currently empty
> ------------------------------------------------
>
>                 Key: FLINK-5363
>                 URL: https://issues.apache.org/jira/browse/FLINK-5363
>             Project: Flink
>          Issue Type: Bug
>          Components: DataStream API
>            Reporter: Aljoscha Krettek
>            Priority: Major
>
> Currently, when a {{Trigger}} sets a timer and that timer fires in the future at a point when there is currently no data in the window state, then that timer is being ignored.
> This is a problem for some users because they manually set cleanup timers and they need to be called because the trigger needs to cleanup some state. (For normal time windows this is not a problem, but for special cases built on top of {{GlobalWindows}} the current behaviour leads to problems.)



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