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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1108) Incorrect map output key type in MultiQuery optimization
Date Tue, 01 Dec 2009 20:23:20 GMT

     [ https://issues.apache.org/jira/browse/PIG-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Olga Natkovich updated PIG-1108:
--------------------------------

    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

patch committed to trunk and branch 0.6.0. Thanks, Richard!

> Incorrect map output key type in MultiQuery optimization
> --------------------------------------------------------
>
>                 Key: PIG-1108
>                 URL: https://issues.apache.org/jira/browse/PIG-1108
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.6.0
>            Reporter: Ankur
>            Assignee: Richard Ding
>             Fix For: 0.6.0
>
>         Attachments: PIG-1108.patch
>
>
> When trying to merge 2 split plans, one of which never progresses along an M/R boundary,
PIG sets the map-output key type incorrectly resulting in the following error:-
> java.io.IOException: Type mismatch in key from map: expected org.apache.pig.impl.io.NullableText,
recieved org.apache.pig.impl.io.NullableTuple
> 	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:807)
> 	at org.apache.hadoop.mapred.MapTask$OldOutputCollector.collect(MapTask.java:466)
> 	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Map.collect(PigMapReduce.java:108)
> 	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:249)
> 	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:238)
> 	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Map.map(PigMapReduce.java:93)
> 	at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
> 	at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
> 	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
> 	at org.apache.hadoop.mapred.Child.main(Child.java:159)
> Here is a small script to be used a reproducible test case
> rmf plan1
> rmf plan2
> A = LOAD 'data' USING PigStorage() as (a: int, b: chararray);
> SPLIT A into plan1 IF (a>5), plan2 IF (a<5);
> B = GROUP plan1 BY b;
> C = FOREACH B {
>               tmp = ORDER plan1 BY a desc;
>               GENERATE FLATTEN(group) as b, tmp;
>               };
> D = FILTER C BY b is not null;
> STORE D into 'plan1';
> STORE plan2 into 'plan2';

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