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https://issues.apache.org/jira/browse/FLINK-922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14028496#comment-14028496
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Robert Metzger commented on FLINK-922:
--------------------------------------
Thank you for reporting the issue. We will look into it.
Would it be a big deal for you to share the whole source code of your program
with us? (A link to a repo is also okay).
> coGroup ordering NullPointerException
> -------------------------------------
>
> Key: FLINK-922
> URL: https://issues.apache.org/jira/browse/FLINK-922
> Project: Flink
> Issue Type: Bug
> Affects Versions: pre-apache-0.5
> Reporter: Bastian Köcher
>
> I'm running a delta iteration and want to execute an coGroup on the
> solutionset but I'm getting a NullPointerException.
> Here is the stacktrace:
> java.lang.NullPointerException
> at
> eu.stratosphere.compiler.operators.CoGroupDescriptor.instantiate(CoGroupDescriptor.java:131)
> at
> eu.stratosphere.compiler.dag.TwoInputNode.instantiate(TwoInputNode.java:555)
> at
> eu.stratosphere.compiler.dag.TwoInputNode.addLocalCandidates(TwoInputNode.java:523)
> at
> eu.stratosphere.compiler.dag.TwoInputNode.getAlternativePlans(TwoInputNode.java:453)
> at
> eu.stratosphere.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:251)
> at
> eu.stratosphere.compiler.dag.WorksetIterationNode.instantiate(WorksetIterationNode.java:308)
> at
> eu.stratosphere.compiler.dag.TwoInputNode.addLocalCandidates(TwoInputNode.java:523)
> at
> eu.stratosphere.compiler.dag.TwoInputNode.getAlternativePlans(TwoInputNode.java:453)
> at
> eu.stratosphere.compiler.dag.DataSinkNode.getAlternativePlans(DataSinkNode.java:192)
> at eu.stratosphere.compiler.PactCompiler.compile(PactCompiler.java:715)
> at eu.stratosphere.compiler.PactCompiler.compile(PactCompiler.java:553)
> at
> eu.stratosphere.client.LocalExecutor.executePlan(LocalExecutor.java:216)
> at
> eu.stratosphere.api.java.LocalEnvironment.execute(LocalEnvironment.java:57)
> at
> eu.stratosphere.api.java.ExecutionEnvironment.execute(ExecutionEnvironment.java:520)
> And here is my code I use to call the coGroup:
> DeltaIteration<Document, ClusterPair> iteration =
> documents.iterateDelta(similarities, 10000, 1);
>
> DataSet<ClusterPair> linkageSet = iteration.getWorkset().reduce(new
> MinRed());
> DataSet<Document> delta =
> iteration.getSolutionSet().coGroup(linkageSet).where(0).equalTo(1).with(new
> PointUpdater());
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