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https://issues.apache.org/jira/browse/BEAM-10016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17113327#comment-17113327
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Brian Hulette commented on BEAM-10016:
--------------------------------------
This is failing on 2.22.0 release branch. Assuming it is a release blocker?
> Flink postcommits failing testFlattenWithDifferentInputAndOutputCoders2
> -----------------------------------------------------------------------
>
> Key: BEAM-10016
> URL: https://issues.apache.org/jira/browse/BEAM-10016
> Project: Beam
> Issue Type: Bug
> Components: test-failures
> Reporter: Kyle Weaver
> Assignee: Maximilian Michels
> Priority: P2
> Fix For: 2.22.0
>
>
> Both beam_PostCommit_Java_PVR_Flink_Batch and
> beam_PostCommit_Java_PVR_Flink_Streaming are failing newly added test
> org.apache.beam.sdk.transforms.FlattenTest.testFlattenWithDifferentInputAndOutputCoders2.
> SEVERE: Error in task code: CHAIN MapPartition (MapPartition at [6]{Values,
> FlatMapElements, PAssert$0}) -> FlatMap (FlatMap at ExtractOutput[0]) -> Map
> (Key Extractor) -> GroupCombine (GroupCombine at GroupCombine:
> PAssert$0/GroupGlobally/GatherAllOutputs/GroupByKey) -> Map (Key Extractor)
> (2/2) java.lang.ClassCastException: org.apache.beam.sdk.values.KV cannot be
> cast to [B
> at
> org.apache.beam.sdk.coders.ByteArrayCoder.encode(ByteArrayCoder.java:41)
> at
> org.apache.beam.sdk.coders.LengthPrefixCoder.encode(LengthPrefixCoder.java:56)
> at org.apache.beam.sdk.coders.Coder.encode(Coder.java:136)
> at
> org.apache.beam.sdk.util.WindowedValue$FullWindowedValueCoder.encode(WindowedValue.java:590)
> at
> org.apache.beam.sdk.util.WindowedValue$FullWindowedValueCoder.encode(WindowedValue.java:581)
> at
> org.apache.beam.sdk.util.WindowedValue$FullWindowedValueCoder.encode(WindowedValue.java:541)
> at
> org.apache.beam.sdk.fn.data.BeamFnDataSizeBasedBufferingOutboundObserver.accept(BeamFnDataSizeBasedBufferingOutboundObserver.java:109)
> at
> org.apache.beam.runners.fnexecution.control.SdkHarnessClient$CountingFnDataReceiver.accept(SdkHarnessClient.java:667)
> at
> org.apache.beam.runners.flink.translation.functions.FlinkExecutableStageFunction.processElements(FlinkExecutableStageFunction.java:271)
> at
> org.apache.beam.runners.flink.translation.functions.FlinkExecutableStageFunction.mapPartition(FlinkExecutableStageFunction.java:203)
> at
> org.apache.flink.runtime.operators.MapPartitionDriver.run(MapPartitionDriver.java:103)
> at org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:504)
> at
> org.apache.flink.runtime.operators.BatchTask.invoke(BatchTask.java:369)
> at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:705)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:530)
> at java.lang.Thread.run(Thread.java:748)
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