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Date: Mon, 9 Jan 2012 20:09:39 +0000 (UTC)
From: "Robert Joseph Evans (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-3511) Counters occupy a good part of
 AM heap
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13182755#comment-13182755 ] 

Robert Joseph Evans commented on MAPREDUCE-3511:
------------------------------------------------

LGTM +1 (Non-binding)
                
> Counters occupy a good part of AM heap
> --------------------------------------
>
>                 Key: MAPREDUCE-3511
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3511
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mr-am, mrv2
>    Affects Versions: 0.23.0
>            Reporter: Siddharth Seth
>            Assignee: Vinod Kumar Vavilapalli
>            Priority: Blocker
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3511-20120107.1.txt, MAPREDUCE-3511-20120109.txt
>
>
> Per task counters seem to be occupying a good part of an AMs heap. Looks like more than 50% of what's used by a TaskAttemptImpl object.
> This could be optimized by interning strings or possibly using mrv1 counters which are optimized. Currently counters are converted from mrv1 to mrv2 format for in memory storage. The conversion could be delayed till it's actually required for RPC transfers.

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