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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-99) Reducers throw oom exceptions during fetching map outputs
Date Sat, 07 Jul 2012 16:58:34 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-99?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harsh J resolved MAPREDUCE-99.
------------------------------

    Resolution: Cannot Reproduce

Given that we've not seen this report for quite some time now, on 1.x nor 2.x, am closing
this out as its gone stale.
                
> Reducers throw oom exceptions during fetching map outputs
> ---------------------------------------------------------
>
>                 Key: MAPREDUCE-99
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-99
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Runping Qi
>
> I have a job that ran fine if the flag for compressing the map output data to false.
> However, if the flag is set to true and the compression type set to block, then 
> the reducers all died due to out of memory exceptions.
> The heap size was set to 512M.
> The problem persists even when the heapsize set to 1000M.

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