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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4229) Counter names' memory usage can be decreased by interning
Date Tue, 23 Oct 2012 23:16:14 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13482801#comment-13482801
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Vinod Kumar Vavilapalli commented on MAPREDUCE-4229:
----------------------------------------------------

Bobby/Daryn, can one of you file tickets for any pending items on this issue? Thanks.
                
> Counter names' memory usage can be decreased by interning
> ---------------------------------------------------------
>
>                 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
>            Assignee: Miomir Boljanovic
>             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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