[jira] [Created] (BEAM-2735) testMergingCustomWindows tests are incorrect

["Thomas Groh (JIRA)" <ji...@apache.org>]

Thomas Groh created BEAM-2735:
---------------------------------

             Summary: 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: Etienne Chauchot


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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