Stephan Ewen created FLINK-1315:
-----------------------------------

             Summary: Spurious failure in compiler due to corrupt branch 
tracking logic
                 Key: FLINK-1315
                 URL: https://issues.apache.org/jira/browse/FLINK-1315
             Project: Flink
          Issue Type: Improvement
          Components: Optimizer
    Affects Versions: 0.8-incubating
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             Fix For: 0.8-incubating


The optimizer fails in that case with the following stack trace:

{code}
Exception in thread "main" org.apache.flink.compiler.CompilerException: Bug: 
Tracing dams for deadlock detection is broken.
        at 
org.apache.flink.compiler.dag.TwoInputNode.placePipelineBreakersIfNecessary(TwoInputNode.java:618)
        at 
org.apache.flink.compiler.dag.TwoInputNode.instantiate(TwoInputNode.java:553)
        at 
org.apache.flink.compiler.dag.TwoInputNode.addLocalCandidates(TwoInputNode.java:504)
        at 
org.apache.flink.compiler.dag.TwoInputNode.getAlternativePlans(TwoInputNode.java:436)
        at 
org.apache.flink.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:258)
        at 
org.apache.flink.compiler.dag.TwoInputNode.getAlternativePlans(TwoInputNode.java:305)
        at 
org.apache.flink.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:258)
        at 
org.apache.flink.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:258)
        at 
org.apache.flink.compiler.dag.TwoInputNode.getAlternativePlans(TwoInputNode.java:305)
        at 
org.apache.flink.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:258)
        at 
org.apache.flink.compiler.dag.TwoInputNode.getAlternativePlans(TwoInputNode.java:305)
        at 
org.apache.flink.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:258)
        at 
org.apache.flink.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:268)
        at 
org.apache.flink.compiler.dag.BinaryUnionNode.getAlternativePlans(BinaryUnionNode.java:105)
        at 
org.apache.flink.compiler.dag.BinaryUnionNode.getAlternativePlans(BinaryUnionNode.java:104)
        at 
org.apache.flink.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:258)
        at 
org.apache.flink.compiler.dag.BulkIterationNode.instantiateCandidate(BulkIterationNode.java:296)
        at 
org.apache.flink.compiler.dag.SingleInputNode.addLocalCandidates(SingleInputNode.java:367)
        at 
org.apache.flink.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:315)
        at 
org.apache.flink.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:258)
        at 
org.apache.flink.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:258)
        at 
org.apache.flink.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:258)
        at 
org.apache.flink.compiler.dag.BinaryUnionNode.getAlternativePlans(BinaryUnionNode.java:105)
        at 
org.apache.flink.compiler.dag.BinaryUnionNode.getAlternativePlans(BinaryUnionNode.java:104)
        at 
org.apache.flink.compiler.dag.SingleInputNode.getAlternativePlans(SingleInputNode.java:258)
        at 
org.apache.flink.compiler.dag.DataSinkNode.getAlternativePlans(DataSinkNode.java:194)
        at org.apache.flink.compiler.PactCompiler.compile(PactCompiler.java:561)
        at org.apache.flink.compiler.PactCompiler.compile(PactCompiler.java:466)
        at 
org.apache.flink.client.LocalExecutor.executePlan(LocalExecutor.java:233)
        at 
org.apache.flink.api.java.LocalEnvironment.execute(LocalEnvironment.java:51)
        at 
org.apache.flink.api.scala.ExecutionEnvironment.execute(ExecutionEnvironment.scala:391)
{code}

The program that fails in the optimizer is from a user. I have not been able to 
reduce it significantly into a standalone test case that reproduces the bug.



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