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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4866) ShuffleRamManager is limited to 2Gb of memory - we should increase that
Date Tue, 11 Dec 2012 12:53:23 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated MAPREDUCE-4866:
-------------------------------------

    Attachment: M4866-0.patch
    
> ShuffleRamManager is limited to 2Gb of memory - we should increase that
> -----------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4866
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4866
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv1
>    Affects Versions: 0.20.2
>         Environment: linux, 64bits cpu, more than 2Gb of memory for each reducer tasks
>            Reporter: Varene Olivier
>            Priority: Minor
>              Labels: patch
>         Attachments: M4866-0.patch, MAPREDUCE-4866-INCOMPLETE.patch
>
>
> Inside the org.apache.hadoop.mapred.ReduceTask.java, the *ShuffleRamManager* is limited
to allocate up to 2Gb of memory during the shuffle phase. 
> We should be able to allocate more, to take advantage of the full memory we have on servers.

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