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From "Vinod Kumar Vavilapalli (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3511) Counters occupy a good part of AM heap
Date Mon, 09 Jan 2012 19:55:39 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinod Kumar Vavilapalli updated MAPREDUCE-3511:
-----------------------------------------------

    Status: Open  (was: Patch Available)
    
> 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
>
>
> 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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