Thank you for the pull request. The fix is included in the 0.5.1 release.
> 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
> Assignee: Sebastian Kunert
> Fix For: 0.6-incubating, pre-apache-0.5.1
>
> Attachments: IMPRO-3.SS14.G03-test.zip
>
>
> 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());
Locked
