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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PIG-2152) Null pointer exception while reporting progress
Date Fri, 01 Jul 2011 20:35:30 GMT
Null pointer exception while reporting progress
-----------------------------------------------

                 Key: PIG-2152
                 URL: https://issues.apache.org/jira/browse/PIG-2152
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.9.0
            Reporter: Olga Natkovich
             Fix For: 0.9.0


We have observed the following issues with code built from Pig 0.9 branch. We have not seen
this with earlier versions; however, since this happens once in a while and is not reproducible
at will it is not clear whether the issue is specific to 0.9 or not.

Here is the stack:

java.lang.NullPointerException at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.ProgressableReporter.progress(ProgressableReporter.java:37)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:399)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:284)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:290)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLocalRearrange.getNext(POLocalRearrange.java:256)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:261)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:256)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:58)
at
org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144) at
org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764) at
org.apache.hadoop.mapred.MapTask.run(MapTask.java:370) at org.apache.hadoop.mapred.Child$4.run(Child.java:261)
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:1059) at
org.apache.hadoop.mapred.Child.main(Child.java:255) 


Note that the code in progress function looks as follows:

public void progress() {
        if(rep!=null)
            rep.progress();
    }

This points to some sort of synchronization issue 



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