[jira] [Created] (PIG-4722) [Pig on Tez] NPE while running Combiner

["Rohini Palaniswamy (JIRA)" <ji...@apache.org>]

Rohini Palaniswamy created PIG-4722:
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             Summary: [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)
{code}



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