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https://issues.apache.org/jira/browse/BEAM-2571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16078589#comment-16078589
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Kenneth Knowles commented on BEAM-2571:
---------------------------------------

[~aljoscha] any idea why the linked PR would cause a problem for 
CombineWithContext with side inputs in streaming for the FlinkRunner?

At a high level the changes are:
1. drop late processing time timers
2. when trigger/ReduceFnRunner timers arrive together, don't look at the timers 
themselves but just activate the window (this is finally making it match 
https://s.apache.org/beam-triggers and https://s.apache.org/beam-lateness)

> Flink ValidatesRunner failing CombineTest.testSlidingWindowsCombineWithContext
> ------------------------------------------------------------------------------
>
>                 Key: BEAM-2571
>                 URL: https://issues.apache.org/jira/browse/BEAM-2571
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-flink
>            Reporter: Kenneth Knowles
>            Assignee: Kenneth Knowles
>             Fix For: 2.1.0
>
>
> This appears to have been caused by https://github.com/apache/beam/pull/3429 
> which fixes a couple errors in how trigger timers were processed / final 
> panes labeled.
> I am investigating, considering roll back vs forward fix. Since it is an 
> esoteric use case where I would advise users to use a stateful DoFn instead, 
> I think the bug fixed probably outweighs the bug introduced. I would like to 
> fix for 2.1.0 but will report back soon.



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