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From "Rohini Palaniswamy (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PIG-4722) [Pig on Tez] NPE while running Combiner
Date Sat, 31 Oct 2015 02:15:27 GMT

     [ https://issues.apache.org/jira/browse/PIG-4722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rohini Palaniswamy updated PIG-4722:
------------------------------------
    Description: 
DefaultSorter in Tez calls Combiner from two different threads - during spill in SpillThread
and flush in the main thread. If both run the combiner, one ends up with NPE as Reporter is
set on only one thread in initialization. 

{code}
java.lang.NullPointerException
        at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:366)
        at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLocalRearrange.getNextTuple(POLocalRearrange.java:332)
        at org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POLocalRearrangeTez.getNextTuple(POLocalRearrangeTez.java:128)
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.processOnePackageOutput(PigCombiner.java:197)
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.reduce(PigCombiner.java:175)
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.reduce(PigCombiner.java:50)
        at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:171)
        at org.apache.tez.mapreduce.combine.MRCombiner.runNewCombiner(MRCombiner.java:191)
        at org.apache.tez.mapreduce.combine.MRCombiner.combine(MRCombiner.java:115)
        at org.apache.tez.runtime.library.common.sort.impl.ExternalSorter.runCombineProcessor(ExternalSorter.java:279)
        at org.apache.tez.runtime.library.common.sort.impl.dflt.DefaultSorter.spill(DefaultSorter.java:854)
        at org.apache.tez.runtime.library.common.sort.impl.dflt.DefaultSorter.sortAndSpill(DefaultSorter.java:780)
        at org.apache.tez.runtime.library.common.sort.impl.dflt.DefaultSorter$SpillThread.run(DefaultSorter.java:708)
Caused by: java.lang.NullPointerException
        at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:303)
        at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNextTuple(POProject.java:403)
        at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:361)
        ... 12 more
{code}

  was:
DefaultSorter in Tez calls Combiner from two different threads - during spill in SpillThread
and flush in the main thread. If both run the combiner, one ends up with NPE as Reporter is
set on only one thread in initialization. 

{code}
java.lang.NullPointerException
        at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:366)
        at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLocalRearrange.getNextTuple(POLocalRearrange.java:332)
        at org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POLocalRearrangeTez.getNextTuple(POLocalRearrangeTez.java:128)
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.processOnePackageOutput(PigCombiner.java:197)
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.reduce(PigCombiner.java:175)
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.reduce(PigCombiner.java:50)
        at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:171)
        at org.apache.tez.mapreduce.combine.MRCombiner.runNewCombiner(MRCombiner.java:191)
        at org.apache.tez.mapreduce.combine.MRCombiner.combine(MRCombiner.java:115)
        at org.apache.tez.runtime.library.common.sort.impl.ExternalSorter.runCombineProcessor(ExternalSorter.java:279)
        at org.apache.tez.runtime.library.common.sort.impl.dflt.DefaultSorter.spill(DefaultSorter.java:854)
        at org.apache.tez.runtime.library.common.sort.impl.dflt.DefaultSorter.sortAndSpill(DefaultSorter.java:780)
        at org.apache.tez.runtime.library.common.sort.impl.dflt.DefaultSorter$SpillThread.run(DefaultSorter.java:708)
{code}


> [Pig on Tez] NPE while running Combiner
> ---------------------------------------
>
>                 Key: PIG-4722
>                 URL: https://issues.apache.org/jira/browse/PIG-4722
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Rohini Palaniswamy
>
> DefaultSorter in Tez calls Combiner from two different threads - during spill in SpillThread
and flush in the main thread. If both run the combiner, one ends up with NPE as Reporter is
set on only one thread in initialization. 
> {code}
> java.lang.NullPointerException
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:366)
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLocalRearrange.getNextTuple(POLocalRearrange.java:332)
>         at org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POLocalRearrangeTez.getNextTuple(POLocalRearrangeTez.java:128)
>         at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.processOnePackageOutput(PigCombiner.java:197)
>         at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.reduce(PigCombiner.java:175)
>         at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.reduce(PigCombiner.java:50)
>         at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:171)
>         at org.apache.tez.mapreduce.combine.MRCombiner.runNewCombiner(MRCombiner.java:191)
>         at org.apache.tez.mapreduce.combine.MRCombiner.combine(MRCombiner.java:115)
>         at org.apache.tez.runtime.library.common.sort.impl.ExternalSorter.runCombineProcessor(ExternalSorter.java:279)
>         at org.apache.tez.runtime.library.common.sort.impl.dflt.DefaultSorter.spill(DefaultSorter.java:854)
>         at org.apache.tez.runtime.library.common.sort.impl.dflt.DefaultSorter.sortAndSpill(DefaultSorter.java:780)
>         at org.apache.tez.runtime.library.common.sort.impl.dflt.DefaultSorter$SpillThread.run(DefaultSorter.java:708)
> Caused by: java.lang.NullPointerException
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:303)
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNextTuple(POProject.java:403)
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:361)
>         ... 12 more
> {code}



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