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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4229) Intern counter names in the JT
Date Tue, 23 Oct 2012 17:07:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13482467#comment-13482467
] 

Robert Joseph Evans commented on MAPREDUCE-4229:
------------------------------------------------

The patch looks good to me and I am +1 for it, but because I wrote some of it myself it would
be nice if someone else could take a look at it too.
                
> 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-branch-0.23.patch, MAPREDUCE-4229-branch-0.23.patch,
MAPREDUCE-4229.patch, 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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