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https://issues.apache.org/jira/browse/BEAM-10016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17113380#comment-17113380
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Maximilian Michels commented on BEAM-10016:
-------------------------------------------

Just to clarify, since this is only failing for Beam 2.22.0, we don't have to 
block the 2.21.0 release.

> 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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