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https://issues.apache.org/jira/browse/MAPREDUCE-4229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13417795#comment-13417795
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Todd Lipcon commented on MAPREDUCE-4229:
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Hey Miomir. I dont think anyone's working on it. Go for it! I'd suggest looking
at Guava's
[Interner|http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/collect/Interners.html#newWeakInterner()]
implementation
> 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
> Reporter: Todd Lipcon
>
> 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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