Hadoop QA commented on PIG-480:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 887049.

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

    +1 tests included.  The patch appears to include 3 new or modified tests.

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

    -1 javac.  The applied patch generated 217 javac compiler warnings (more 
than the trunk's current 213 warnings).

    -1 findbugs.  The patch appears to cause Findbugs to fail.

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

    -1 core tests.  The patch failed core unit tests.

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

Test results: 
Console output: 

This message is automatically generated.

> PERFORMANCE: Use identity mapper in a chain of M-R jobs
> -------------------------------------------------------
>                 Key: PIG-480
>                 URL: https://issues.apache.org/jira/browse/PIG-480
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.2.0
>            Reporter: Olga Natkovich
>            Assignee: Ying He
>         Attachments: PIG_480.patch
> For jobs with two or more MR jobs, use identity mapper wherever possible in 
> second and subsequent MR jobs. Identity mapper is about 50% than pig empty 
> map job because it doesn't parse the data. 

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