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From "Lohit Vijayarenu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PIG-3241) ConcurrentModificationException in POPartialAgg
Date Thu, 07 Mar 2013 18:36:14 GMT
Lohit Vijayarenu created PIG-3241:
-------------------------------------

             Summary: ConcurrentModificationException in POPartialAgg
                 Key: PIG-3241
                 URL: https://issues.apache.org/jira/browse/PIG-3241
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.11
            Reporter: Lohit Vijayarenu


While running few PIG scripts against Hadoop 2.0, I see consistently see ConcurrentModificationException


{noformat}
at java.util.HashMap$HashIterator.remove(HashMap.java:811)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POPartialAgg.aggregate(POPartialAgg.java:365)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POPartialAgg.aggregateSecondLevel(POPartialAgg.java:379)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POPartialAgg.getNext(POPartialAgg.java:203)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:308)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLocalRearrange.getNext(POLocalRearrange.java:263)
	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.runPipeline(PigGenericMapBase.java:283)
	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:278)
	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:64)
	at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:729)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:334)
	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:158)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:396)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1441)
	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:153)
{noformat}

It looks like there is rawInputMap is being modified while elements are removed from it. 

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