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https://issues.apache.org/jira/browse/MAPREDUCE-4229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13482719#comment-13482719
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Hudson commented on MAPREDUCE-4229:
-----------------------------------
Integrated in Hadoop-trunk-Commit #2918 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/2918/])
Updating credits for MAPREDUCE-4229. (Revision 1401493)
Result = SUCCESS
daryn : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1401493
Files :
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
> Intern counter names in the JT
> ------------------------------
>
> Key: MAPREDUCE-4229
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4229
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker
> Affects Versions: 1.0.2, 3.0.0, 2.0.2-alpha
> Reporter: Todd Lipcon
> Fix For: 3.0.0, 2.0.3-alpha, 0.23.5
>
> Attachments: MAPREDUCE-4229-branch-0.23.patch,
> MAPREDUCE-4229-branch-0.23.patch, MAPREDUCE-4229.patch, mr-4229.txt,
> MR-4229.txt
>
>
> In our experience, most of the memory in production JTs goes to storing
> counter names (String objects and character arrays). Since most counter names
> are reused again and again, it would be a big memory savings to keep a hash
> set of already-used counter names within a job, and refer to the same object
> from all tasks.
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