[FLINK-2814] DeltaIteration: DualInputPlanNode cannot be cast to SingleInputPlanNode

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.10.0
• Fix Version/s: 1.3.0
• Component/s: API / DataSet
• Assignee: Rekha Joshi
• Reporter: Greg Hogan
• Created: 02/Oct/15 20:07
• Updated: 28/Feb/19 14:30
• Resolved: 31/Mar/17 16:37

Description

A delta iteration that closes with a solution set which is a JoinOperator throws the following exception:

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

Temporary fix is to attach an identity mapper.

Issue Links

• links to: GitHub Pull Request #2029
• links to: GitHub Pull Request #3563