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https://issues.apache.org/jira/browse/MAPREDUCE-4229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Joseph Evans updated MAPREDUCE-4229:
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Target Version/s: 0.23.5 (was: 1.1.0)
Affects Version/s: 2.0.2-alpha
3.0.0
Status: Open (was: Patch Available)
Canceling patch until my concerns are addressed, and updating target/affects
fields appropriately. I targeted this for 0.23.5 because I would love to see
this on branch-0.23.
> 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
> Attachments: MAPREDUCE-4229.patch
>
>
> 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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