[PIG-4343] Tez auto parallelism fails at query compile time

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.14.0
• Component/s: tez
• Assignee: Unassigned
• Reporter: Cheolsoo Park
• Created: 24/Nov/14 22:43
• Updated: 24/Mar/15 10:05

Description

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-

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