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https://issues.apache.org/jira/browse/BEAM-2735?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Groh reassigned BEAM-2735:
---------------------------------

    Assignee: Thomas Groh  (was: Etienne Chauchot)

> testMergingCustomWindows tests are incorrect
> --------------------------------------------
>
>                 Key: BEAM-2735
>                 URL: https://issues.apache.org/jira/browse/BEAM-2735
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>    Affects Versions: 2.2.0
>            Reporter: Thomas Groh
>            Assignee: Thomas Groh
>
> If the input is rewritten to use to use {{TestStream}}, and executes in the 
> DirectRunner, the tests fail. My expectation is that this is due to a 
> disagreement in what the tests expect to be merged (if all of the merging 
> logic is run only once), as opposed to running the merging logic 
> incrementally with a perfect watermark.
> This is also causing failures in the Dataflow {{ValidatesRunner}} suite.
> {code:java}
>     PCollection<String> inputCollection =
>         pipeline.apply(
>             TestStream.create(StringUtf8Coder.of())
>                 
> .advanceWatermarkTo(startInstant.plus(Duration.standardSeconds(10L)))
>                 .addElements("big")
>                 
> .advanceWatermarkTo(startInstant.plus(Duration.standardSeconds(20L)))
>                 .addElements("small1")
>                 
> .advanceWatermarkTo(startInstant.plus(Duration.standardSeconds(39L)))
>                 .addElements("small2")
>                 
> .advanceWatermarkTo(startInstant.plus(Duration.standardSeconds(250L)))
>                 .advanceWatermarkToInfinity());
>  {code}



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