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Posted to issues@beam.apache.org by "Kenneth Knowles (Jira)" <ji...@apache.org> on 2020/10/09 16:38:00 UTC

[jira] [Commented] (BEAM-4255) GloballyAsSingletonView is writing multiple values to the SingletonView

    [ https://issues.apache.org/jira/browse/BEAM-4255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17211152#comment-17211152 ] 

Kenneth Knowles commented on BEAM-4255:
---------------------------------------

As mentioned on the PR, side inputs just don't work very well with triggers.

> GloballyAsSingletonView is writing multiple values to the SingletonView
> -----------------------------------------------------------------------
>
>                 Key: BEAM-4255
>                 URL: https://issues.apache.org/jira/browse/BEAM-4255
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>    Affects Versions: 2.4.0
>            Reporter: Batkhuyag Batsaikhan
>            Priority: P3
>             Fix For: 3.0.0
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> The code snippet below is writing multiple values to the sideInput. Resulting in exception: "PCollection with more than one element accessed as a singleton view."
> PCollectionView<Integer> globalView = input
>  .apply(Window.<Integer>into(new GlobalWindows())
>     .triggering(Repeatedly.forever(AfterPane.elementCountAtLeast(1)))
>     .accumulatingFiredPanes())
>  .apply(Sum.integersGlobally().asSingletonView())
>  
>  



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