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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4229) Intern counter names in the JT
Date Tue, 02 Oct 2012 19:41:09 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Robert Joseph Evans updated MAPREDUCE-4229:

     Target Version/s: 0.23.5  (was: 1.1.0)
    Affects Version/s: 2.0.2-alpha
               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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