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https://issues.apache.org/jira/browse/PIG-4343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14377594#comment-14377594
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Rohini Palaniswamy commented on PIG-4343:
-----------------------------------------
This could be a dupe of PIG-4474
> Tez auto parallelism fails at query compile time
> ------------------------------------------------
>
> Key: PIG-4343
> URL: https://issues.apache.org/jira/browse/PIG-4343
> Project: Pig
> Issue Type: Bug
> Components: tez
> Affects Versions: 0.14.0
> Reporter: Cheolsoo Park
>
> I was running some legacy MR jobs in Tez mode to do perf benchmarks. But when
> {{pig.tez.auto.parallelism}} is enabled (by default), Pig fails with the
> following error-
> {code}
> org.apache.pig.impl.plan.VisitorException: ERROR 0: java.io.IOException:
> Cannot estimate parallelism for scope-892, effective parallelism for
> predecessor scope-892 is -1
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.optimizer.ParallelismSetter.visitTezOp(ParallelismSetter.java:189)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.TezOperator.visit(TezOperator.java:232)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.TezOperator.visit(TezOperator.java:49)
> at
> org.apache.pig.impl.plan.DependencyOrderWalker.walk(DependencyOrderWalker.java:70)
> at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:46)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.TezLauncher.processLoadAndParallelism(TezLauncher.java:429)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.TezLauncher.launchPig(TezLauncher.java:143)
> at
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.launchPig(HExecutionEngine.java:301)
> at org.apache.pig.PigServer.launchPlan(PigServer.java:1390)
> at org.apache.pig.LipstickPigServer.launchPlan(LipstickPigServer.java:151)
> at
> org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1375)
> at org.apache.pig.PigServer.execute(PigServer.java:1364)
> at org.apache.pig.PigServer.executeBatch(PigServer.java:415)
> at org.apache.pig.PigServer.executeBatch(PigServer.java:398)
> at
> org.apache.pig.tools.grunt.GruntParser.executeBatch(GruntParser.java:171)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:234)
> at
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:205)
> at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:81)
> at com.netflix.lipstick.Main.run(Main.java:496)
> at com.netflix.lipstick.Main.main(Main.java:171)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:212)
> Caused by: java.io.IOException: Cannot estimate parallelism for scope-892,
> effective parallelism for predecessor scope-892 is -1
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.optimizer.TezOperDependencyParallelismEstimator.estimateParallelism(TezOperDependencyParallelismEstimator.java:116)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.optimizer.ParallelismSetter.visitTezOp(ParallelismSetter.java:134)
> ... 24 more
> {code}
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