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https://issues.apache.org/jira/browse/BEAM-3269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16330989#comment-16330989
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Sam Whittle commented on BEAM-3269:
-----------------------------------
Another failure for this test:
[https://builds.apache.org/job/beam_PreCommit_Java_GradleBuild/1160/testReport/org.apache.beam.runners.apex.translation/ParDoTranslatorTest/testAssertionFailure/]
Unclear if it's the same ClassCastException since the log appears truncated.
> Occasional ClassCastException in ParDoTranslatorTest.testAssertionFailure
> -------------------------------------------------------------------------
>
> Key: BEAM-3269
> URL: https://issues.apache.org/jira/browse/BEAM-3269
> Project: Beam
> Issue Type: Bug
> Components: runner-apex
> Reporter: Eugene Kirpichov
> Assignee: Thomas Weise
> Priority: Major
>
> A postcommit build failed:
> https://builds.apache.org/job/beam_PostCommit_Java_MavenInstall/org.apache.beam$beam-runners-apex/5326/testReport/junit/org.apache.beam.runners.apex.translation/ParDoTranslatorTest/testAssertionFailure/
> because the following exception happened instead of the expected PAssert
> assertion failure exception:
> {code}
> 85212
> [1/PAssert$2/GroupGlobally/Create.Values:ApexReadUnboundedInputOperator] INFO
> com.datatorrent.stram.StramLocalCluster - container-10 msg: Stopped running
> due to an exception. java.lang.ClassCastException: java.lang.String cannot be
> cast to org.apache.beam.sdk.values.KV
> at org.apache.beam.sdk.coders.KvCoder.encode(KvCoder.java:36)
> at
> org.apache.beam.sdk.util.WindowedValue$FullWindowedValueCoder.encode(WindowedValue.java:652)
> at
> org.apache.beam.sdk.util.WindowedValue$FullWindowedValueCoder.encode(WindowedValue.java:599)
> at
> org.apache.beam.runners.apex.translation.utils.ApexStreamTuple$ApexStreamTupleCoder.encode(ApexStreamTuple.java:179)
> at
> org.apache.beam.runners.apex.translation.utils.ApexStreamTuple$ApexStreamTupleCoder.encode(ApexStreamTuple.java:152)
> at
> org.apache.beam.runners.apex.translation.utils.CoderAdapterStreamCodec.toByteArray(CoderAdapterStreamCodec.java:61)
> at
> com.datatorrent.stram.stream.BufferServerPublisher.put(BufferServerPublisher.java:140)
> at com.datatorrent.api.DefaultOutputPort.emit(DefaultOutputPort.java:59)
> at
> org.apache.beam.runners.apex.translation.operators.ApexReadUnboundedInputOperator.emitTuples(ApexReadUnboundedInputOperator.java:157)
> at com.datatorrent.stram.engine.InputNode.run(InputNode.java:124)
> at
> com.datatorrent.stram.engine.StreamingContainer$2.run(StreamingContainer.java:1428)
> {code}
> I wasn't able to reproduce this issue by running the test locally >100 times,
> but it looks alarming nevertheless.
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