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https://issues.apache.org/jira/browse/MAPREDUCE-3813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201011#comment-13201011
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Hadoop QA commented on MAPREDUCE-3813:
--------------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  
http://issues.apache.org/jira/secure/attachment/12513387/MAPREDUCE-3813-20120205.txt
  against trunk revision .

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

    +1 tests included.  The patch appears to include 2 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 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) 
warnings.

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

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

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

Test results: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1785//testReport/
Console output: 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1785//console

This message is automatically generated.
                
> RackResolver should maintain a cache to avoid repetitive lookups.
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-3813
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3813
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mrv2, performance
>    Affects Versions: 0.23.0
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Vinod Kumar Vavilapalli
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3813-20120205.txt
>
>
> With the current code, during task creation, we repeatedly resolve hosts and 
> RackResolver doesn't cache any of the results. Caching will improve 
> performance.

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