[jira] [Updated] (PIG-2152) Null pointer exception while reporting progress

["Vivek Padmanabhan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-2152?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vivek Padmanabhan updated PIG-2152:
-----------------------------------

    Attachment: null_pointer_traces (copy)

Attaching a list of different traces

> 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
>
>         Attachments: null_pointer_traces (copy)
>
>
> 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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