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https://issues.apache.org/jira/browse/PIG-5444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17786019#comment-17786019
 ] 

Koji Noguchi commented on PIG-5444:
-----------------------------------

This is how it looks when testFRJoinOut8 is run by itself when 
MultiQueryOptimizerTez happen to work on A before B.   Note POValueOutputTez on 
B is there to prevent the overlapping edges.
{code:java}
Tez vertex scope-48
# Plan on vertex
B: Split - scope-61
|   |
|   Local Rearrange[tuple]{int}(false) - scope-27       ->       scope-44
|   |   |
|   |   Project[int][0] - scope-23
|   |
|   POValueOutputTez - scope-49 ->       [scope-54]
|
|---B: New For Each(false,false)[bag] - scope-18
    |   |
    |   Cast[int] - scope-13
    |   |
    |   |---Project[bytearray][0] - scope-12
    |   |
    |   Cast[int] - scope-16
    |   |
    |   |---Project[bytearray][1] - scope-15
    |
    |---B: 
Load(hdfs://localhost:38814/user/gtrain/testFrJoinInput2.txt:org.apache.pig.builtin.PigStorage)
 - scope-11
Tez vertex scope-54
# Plan on vertex
Local Rearrange[tuple]{int}(false) - scope-39   ->       scope-44
|   |
|   Project[int][1] - scope-35
|
|---POValueInputTez - scope-55  <-       scope-48
Tez vertex scope-44
# Plan on vertex
A: Split - scope-60
|   |
|   E: 
Store(hdfs://localhost:38814/tmp/temp-1966813510/tmp-652837441:org.apache.pig.impl.io.InterStorage)
 - scope-62   ->       scope-43
|   |
|   |---D: FRJoin[tuple] - scope-36     <-       scope-54
|       |   |
|       |   Project[int][1] - scope-34
|       |   |
|       |   Project[int][1] - scope-35
|   |
|   E: 
Store(hdfs://localhost:38814/tmp/temp-1966813510/tmp-652837441:org.apache.pig.impl.io.InterStorage)
 - scope-63   ->       scope-43
|   |
|   |---C: FRJoin[tuple] - scope-24     <-       scope-48
|       |   |
|       |   Project[int][0] - scope-22
|       |   |
|       |   Project[int][0] - scope-23
|
|---A: New For Each(false,false)[bag] - scope-7
    |   |
    |   Cast[int] - scope-2
    |   |
    |   |---Project[bytearray][0] - scope-1
    |   |
    |   Cast[int] - scope-5
    |   |
    |   |---Project[bytearray][1] - scope-4
    |
    |---A: 
Load(hdfs://localhost:38814/user/gtrain/testFrJoinInput.txt:org.apache.pig.builtin.PigStorage)
 - scope-0
 {code}

> TestFRJoin.testFRJoinOut7 and testFRJoinOut8 failing with Edge already 
> defined error on Tez
> -------------------------------------------------------------------------------------------
>
>                 Key: PIG-5444
>                 URL: https://issues.apache.org/jira/browse/PIG-5444
>             Project: Pig
>          Issue Type: Bug
>          Components: tez
>            Reporter: Koji Noguchi
>            Assignee: Koji Noguchi
>            Priority: Major
>
> With Tez, when testing individual tests (TestFRJoin.testFRJoinOut7 and 
> testFRJoinOut8) separately, they pass the tests. But when entire TestFRJoin 
> is run, these two tests on Tez are failing with
> {noformat}
> Unable to open iterator for alias E
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to 
> open iterator for alias E
> at org.apache.pig.PigServer.openIterator(PigServer.java:1024)
> at org.apache.pig.test.TestFRJoin.testFRJoinOut7(TestFRJoin.java:409)
> Caused by: org.apache.pig.PigException: ERROR 1002: Unable to store alias E
> at org.apache.pig.PigServer.storeEx(PigServer.java:1127)
> at org.apache.pig.PigServer.store(PigServer.java:1086)
> at org.apache.pig.PigServer.openIterator(PigServer.java:999)
> Caused by: 
> org.apache.pig.backend.hadoop.executionengine.JobCreationException: ERROR 
> 2017: Internal error creating job configuration.
> at 
> org.apache.pig.backend.hadoop.executionengine.tez.TezJobCompiler.getJob(TezJobCompiler.java:153)
> at 
> org.apache.pig.backend.hadoop.executionengine.tez.TezJobCompiler.compile(TezJobCompiler.java:81)
> at 
> org.apache.pig.backend.hadoop.executionengine.tez.TezLauncher.launchPig(TezLauncher.java:200)
> at 
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.launchPig(HExecutionEngine.java:290)
> at org.apache.pig.PigServer.launchPlan(PigServer.java:1479)
> at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1464)
> at org.apache.pig.PigServer.storeEx(PigServer.java:1123)
> Caused by: java.lang.IllegalArgumentException: Edge [scope-632 : 
> org.apache.pig.backend.hadoop.executionengine.tez.runtime.PigProcessor] -> 
> [scope-628 : 
> org.apache.pig.backend.hadoop.executionengine.tez.runtime.PigProcessor] ({ 
> BROADCAST : org.apache.tez.runtime.library.input.UnorderedKVInput >> 
> PERSISTED >> org.apache.tez.runtime.library.output.UnorderedKVOutput >> 
> NullEdgeManager }) already defined!
> at org.apache.tez.dag.api.DAG.addEdge(DAG.java:296)
> at 
> org.apache.pig.backend.hadoop.executionengine.tez.TezDagBuilder.visitTezOp(TezDagBuilder.java:410)
> at 
> org.apache.pig.backend.hadoop.executionengine.tez.plan.TezOperator.visit(TezOperator.java:265)
> at 
> org.apache.pig.backend.hadoop.executionengine.tez.plan.TezOperator.visit(TezOperator.java:56)
> at 
> org.apache.pig.impl.plan.DependencyOrderWalker.walk(DependencyOrderWalker.java:87)
> at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:46)
> at 
> org.apache.pig.backend.hadoop.executionengine.tez.TezJobCompiler.buildDAG(TezJobCompiler.java:69)
> at 
> org.apache.pig.backend.hadoop.executionengine.tez.TezJobCompiler.getJob(TezJobCompiler.java:120)
> {noformat}



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