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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3511) Counters occupy a good part of AM heap
Date Sun, 08 Jan 2012 02:25:39 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13182181#comment-13182181
] 

Hadoop QA commented on MAPREDUCE-3511:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12509821/MAPREDUCE-3511-20120107.1.txt
  against trunk revision .

    +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 eclipse:eclipse.  The patch built with eclipse:eclipse.

    -1 findbugs.  The patch appears to introduce 1 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 failed these unit tests:
                  org.apache.hadoop.mapreduce.security.TestTokenCache

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

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1566//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1566//artifact/trunk/hadoop-mapreduce-project/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-app.html
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1566//console

This message is automatically generated.
                
> Counters occupy a good part of AM heap
> --------------------------------------
>
>                 Key: MAPREDUCE-3511
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3511
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mr-am, mrv2
>    Affects Versions: 0.23.0
>            Reporter: Siddharth Seth
>            Assignee: Vinod Kumar Vavilapalli
>            Priority: Blocker
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3511-20120107.1.txt
>
>
> Per task counters seem to be occupying a good part of an AMs heap. Looks like more than
50% of what's used by a TaskAttemptImpl object.
> This could be optimized by interning strings or possibly using mrv1 counters which are
optimized. Currently counters are converted from mrv1 to mrv2 format for in memory storage.
The conversion could be delayed till it's actually required for RPC transfers.

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