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https://issues.apache.org/jira/browse/BEAM-6839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kenneth Knowles updated BEAM-6839:
----------------------------------
    Priority: Critical  (was: Major)

> User reports protobuf ClassChangeError running against 2.6.0 or above
> ---------------------------------------------------------------------
>
>                 Key: BEAM-6839
>                 URL: https://issues.apache.org/jira/browse/BEAM-6839
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-dataflow
>            Reporter: Kenneth Knowles
>            Priority: Critical
>              Labels: triaged
>             Fix For: 2.12.0
>
>
> https://stackoverflow.com/questions/55146663/issue-while-running-dataflow/55171101?noredirect=1#comment97081527_55171101
> {code}
> java.lang.IncompatibleClassChangeError: Class 
> org.apache.beam.model.pipeline.v1.RunnerApi$StandardPTransforms$Primitives 
> does not implement the requested interface 
> com.google.protobuf.ProtocolMessageEnum at 
> org.apache.beam.runners.core.construction.BeamUrns.getUrn(BeamUrns.java:27) 
> at 
> org.apache.beam.runners.core.construction.PTransformTranslation.(PTransformTranslation.java:58)
>  at 
> org.apache.beam.runners.core.construction.UnconsumedReads$1.visitValue(UnconsumedReads.java:49)
>  at 
> org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:666)
>  at 
> org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:649)
>  at 
> org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:649)
>  at 
> org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:649)
>  at 
> org.apache.beam.sdk.runners.TransformHierarchy$Node.access$600(TransformHierarchy.java:311)
>  at 
> org.apache.beam.sdk.runners.TransformHierarchy.visit(TransformHierarchy.java:245)
>  at org.apache.beam.sdk.Pipeline.traverseTopologically(Pipeline.java:458) at 
> org.apache.beam.runners.core.construction.UnconsumedReads.ensureAllReadsConsumed(UnconsumedReads.java:40)
>  at 
> org.apache.beam.runners.dataflow.DataflowRunner.replaceTransforms(DataflowRunner.java:868)
>  at 
> org.apache.beam.runners.dataflow.DataflowRunner.run(DataflowRunner.java:660) 
> at 
> org.apache.beam.runners.dataflow.DataflowRunner.run(DataflowRunner.java:173) 
> at org.apache.beam.sdk.Pipeline.run(Pipeline.java:313) at 
> org.apache.beam.sdk.Pipeline.run(Pipeline.java:299)
> {code}



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