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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-846) MultiQuery optimization in some cases has an issue when there is a split in the map plan
Date Sat, 13 Jun 2009 04:13:08 GMT

    [ https://issues.apache.org/jira/browse/PIG-846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12719075#action_12719075

Hadoop QA commented on PIG-846:

+1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 783955.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 18 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/79/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/79/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/79/console

This message is automatically generated.

> MultiQuery optimization in some cases has an issue when there is a split in the map plan

> -----------------------------------------------------------------------------------------
>                 Key: PIG-846
>                 URL: https://issues.apache.org/jira/browse/PIG-846
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.2.1
>            Reporter: Pradeep Kamath
>            Assignee: Pradeep Kamath
>             Fix For: 0.3.0
>         Attachments: PIG-846-v2.patch, PIG-846.patch
> The following script produces the error that follows:
> {noformat}
> A = LOAD 'input.txt' as (f0, f1, f2, f3, f4, f5, f6, f7, f8); 
> B = FOREACH A GENERATE f0, f1, f2, f3, f4;
> B1 = foreach B generate f0, f1, f2;
> C = GROUP B1 BY (f1, f2);
> STORE C into 'foo1';
> B2 = FOREACH B GENERATE f0, f3, f4;
> E = GROUP B2 BY (f3, f4);
> STORE E into 'foo2';
> F = FOREACH A GENERATE f0, f5, f6, f7, f8;
> F1 = FOREACH F GENERATE f0, f5,f6;
> G = GROUP F1 BY (f5, f6);
> STORE G into 'foo3';
> F2  = FOREACH F GENERATE f0, f7, f8;
> I = GROUP F2 BY (f7, f8);
> STORE I into 'foo4';
> {noformat}
> Exception encountered during execution:
> {noformat}
> java.lang.NullPointerException
> 	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POPackage.getValueTuple(POPackage.java:262)
> 	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POPackage.getNext(POPackage.java:209)
> 	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POMultiQueryPackage.getNext(POMultiQueryPackage.java:186)
> 	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POMultiQueryPackage.getNext(POMultiQueryPackage.java:186)
> 	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.processOnePackageOutput(PigMapReduce.java:277)
> 	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.reduce(PigMapReduce.java:268)
> 	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.reduce(PigMapReduce.java:142)
> 	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:318)
> 	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2207)
> {noformat}

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