Rohini Palaniswamy created PIG-4722: ---------------------------------------
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} -- This message was sent by Atlassian JIRA (v6.3.4#6332)