[jira] [Commented] (FLINK-2814) DeltaIteration: DualInputPlanNode cannot be cast to SingleInputPlanNode

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-2814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15888401#comment-15888401 ] 

ASF GitHub Bot commented on FLINK-2814:
---------------------------------------

Github user greghogan commented on the issue:

    https://github.com/apache/flink/pull/2029
  
    @StephanEwen it is line 454: `solutionSetCandidate = siSolutionDeltaCandidate.getInput().getSource();` where I am seeing `solutionSetCandidate` changed from a `SingleInputPlanNode` to `DualInputPlanNode`. Why are we not exiting the loops after creating and adding the `WorksetIterationPlanNode`?


> DeltaIteration: DualInputPlanNode cannot be cast to SingleInputPlanNode
> -----------------------------------------------------------------------
>
>                 Key: FLINK-2814
>                 URL: https://issues.apache.org/jira/browse/FLINK-2814
>             Project: Flink
>          Issue Type: Bug
>          Components: Optimizer
>    Affects Versions: 0.10.0
>            Reporter: Greg Hogan
>            Assignee: Rekha Joshi
>
> A delta iteration that closes with a solution set which is a {{JoinOperator}} throws the following exception:
> {noformat}
> org.apache.flink.client.program.ProgramInvocationException: The main method caused an error.
> 	at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:444)
> 	at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:345)
> 	at org.apache.flink.client.program.Client.runBlocking(Client.java:289)
> 	at org.apache.flink.client.CliFrontend.executeProgramBlocking(CliFrontend.java:669)
> 	at org.apache.flink.client.CliFrontend.run(CliFrontend.java:324)
> 	at org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:969)
> 	at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1019)
> Caused by: java.lang.ClassCastException: org.apache.flink.optimizer.plan.DualInputPlanNode cannot be cast to org.apache.flink.optimizer.plan.SingleInputPlanNode
> 	at org.apache.flink.optimizer.dag.WorksetIterationNode.instantiate(WorksetIterationNode.java:432)
> 	at org.apache.flink.optimizer.dag.TwoInputNode.addLocalCandidates(TwoInputNode.java:557)
> 	at org.apache.flink.optimizer.dag.TwoInputNode.getAlternativePlans(TwoInputNode.java:478)
> 	at org.apache.flink.optimizer.dag.DataSinkNode.getAlternativePlans(DataSinkNode.java:204)
> 	at org.apache.flink.optimizer.dag.TwoInputNode.getAlternativePlans(TwoInputNode.java:309)
> 	at org.apache.flink.optimizer.dag.TwoInputNode.getAlternativePlans(TwoInputNode.java:308)
> 	at org.apache.flink.optimizer.Optimizer.compile(Optimizer.java:500)
> 	at org.apache.flink.optimizer.Optimizer.compile(Optimizer.java:402)
> 	at org.apache.flink.client.program.Client.getOptimizedPlan(Client.java:271)
> 	at org.apache.flink.client.program.Client.getOptimizedPlan(Client.java:543)
> 	at org.apache.flink.client.program.Client.runBlocking(Client.java:350)
> 	at org.apache.flink.client.program.ContextEnvironment.execute(ContextEnvironment.java:64)
> 	at org.apache.flink.api.java.ExecutionEnvironment.execute(ExecutionEnvironment.java:796)
> 	at org.apache.flink.api.java.DataSet.collect(DataSet.java:424)
> 	at org.apache.flink.api.java.DataSet.print(DataSet.java:1365)
> 	at Driver.main(Driver.java:366)
> 	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:497)
> 	at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:429)
> 	... 6 more
> {noformat}
> Temporary fix is to attach an identity mapper.



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