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https://issues.apache.org/jira/browse/PIG-4722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15004552#comment-15004552
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Daniel Dai commented on PIG-4722:
---------------------------------
+1
> [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
> Assignee: Rohini Palaniswamy
> Fix For: 0.16.0
>
> Attachments: PIG-4722-1.patch
>
>
> 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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