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https://issues.apache.org/jira/browse/HADOOP-875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Devaraj Das resolved HADOOP-875.
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Resolution: Fixed
Improved this as part of HADOOP-1698.
> memory model is not accurate enough for map side sorts
> ------------------------------------------------------
>
> Key: HADOOP-875
> URL: https://issues.apache.org/jira/browse/HADOOP-875
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.10.0
> Reporter: Owen O'Malley
> Assignee: Devaraj Das
>
> I configured a sort (IdentityMapper) with large compressed values with the
> map output buffer (io.sort.mb) set to 300mb and the child jvm heap size set
> to 900mb and some of the maps were running out of memory deterministically. I
> suspect that some part of the data path is not handling large values well and
> is consuming large amounts of ram.
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