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https://issues.apache.org/jira/browse/BEAM-8989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17045959#comment-17045959
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Ismaël Mejía commented on BEAM-8989:
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This is not an error on Nemo runner. The mistake here is that we changed the
signature of a public method in ParDo.java: From `public
List<PCollectionView<?>> getSideInputs()` into `public Map<String,
PCollectionView<?>> getSideInputs()` so we have two options: (1) re introduce
the old signature (and rename the Map based one) or (2) add this information to
the release notes in the backwards incompatible changes. Notice that this
happened originally in release 2.16.0 but was never announced because it was
discovered 'recently' thanks to the Nemo runner quickstart.
I tend to prefer (2) even if it is less user friendly, in this case Nemo should
be updated but since the runner is not in Beam's repo it is not blocking for us.
> Backwards incompatible change in ParDo.getSideInputs (caught by failure when
> running Apache Nemo quickstart)
> ------------------------------------------------------------------------------------------------------------
>
> Key: BEAM-8989
> URL: https://issues.apache.org/jira/browse/BEAM-8989
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Affects Versions: 2.16.0, 2.17.0, 2.18.0, 2.19.0
> Reporter: Luke Cwik
> Assignee: Reuven Lax
> Priority: Critical
> Fix For: 2.20.0
>
>
> [PR/9275|https://github.com/apache/beam/pull/9275] changed
> *ParDo.getSideInputs* from *List<PCollectionView>* to *Map<String,
> PCollectionView>* which is backwards incompatible change and was released as
> part of Beam 2.16.0 erroneously.
> Running the Apache Nemo Quickstart fails with:
>
> {code:java}
> Exception in thread "main" java.lang.RuntimeException: Translator private
> static void
> org.apache.nemo.compiler.frontend.beam.PipelineTranslator.parDoMultiOutputTranslator(org.apache.nemo.compiler.frontend.beam.PipelineTranslationContext,org.apache.beam.sdk.runners.TransformHierarchy$Node,org.apache.beam.sdk.transforms.ParDo$MultiOutput)
> have failed to translate
> org.apache.beam.examples.WordCount$ExtractWordsFn@600b9d27Exception in thread
> "main" java.lang.RuntimeException: Translator private static void
> org.apache.nemo.compiler.frontend.beam.PipelineTranslator.parDoMultiOutputTranslator(org.apache.nemo.compiler.frontend.beam.PipelineTranslationContext,org.apache.beam.sdk.runners.TransformHierarchy$Node,org.apache.beam.sdk.transforms.ParDo$MultiOutput)
> have failed to translate
> org.apache.beam.examples.WordCount$ExtractWordsFn@600b9d27 at
> org.apache.nemo.compiler.frontend.beam.PipelineTranslator.translatePrimitive(PipelineTranslator.java:113)
> at
> org.apache.nemo.compiler.frontend.beam.PipelineVisitor.visitPrimitiveTransform(PipelineVisitor.java:46)
> at
> org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:665)
> at
> org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:657)
> at
> org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:657)
> at
> org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:657)
> at
> org.apache.beam.sdk.runners.TransformHierarchy$Node.access$600(TransformHierarchy.java:317)
> at
> org.apache.beam.sdk.runners.TransformHierarchy.visit(TransformHierarchy.java:251)
> at org.apache.beam.sdk.Pipeline.traverseTopologically(Pipeline.java:460) at
> org.apache.nemo.compiler.frontend.beam.NemoRunner.run(NemoRunner.java:80) at
> org.apache.nemo.compiler.frontend.beam.NemoRunner.run(NemoRunner.java:31) at
> org.apache.beam.sdk.Pipeline.run(Pipeline.java:315) at
> org.apache.beam.sdk.Pipeline.run(Pipeline.java:301) at
> org.apache.beam.examples.WordCount.runWordCount(WordCount.java:185) at
> org.apache.beam.examples.WordCount.main(WordCount.java:192)Caused by:
> java.lang.reflect.InvocationTargetException at
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498) at
> org.apache.nemo.compiler.frontend.beam.PipelineTranslator.translatePrimitive(PipelineTranslator.java:109)
> ... 14 moreCaused by: java.lang.NoSuchMethodError:
> org.apache.beam.sdk.transforms.ParDo$MultiOutput.getSideInputs()Ljava/util/List;
> at
> org.apache.nemo.compiler.frontend.beam.PipelineTranslator.parDoMultiOutputTranslator(PipelineTranslator.java:236)
> ... 19 more{code}
>
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