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https://issues.apache.org/jira/browse/HADOOP-872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen O'Malley resolved HADOOP-872.
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Resolution: Duplicate
HADOOP-2919 fixed this.
> map output sorter doesn't compress the outputs before the sort
> --------------------------------------------------------------
>
> Key: HADOOP-872
> URL: https://issues.apache.org/jira/browse/HADOOP-872
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.10.0
> Reporter: Owen O'Malley
> Assignee: Devaraj Das
>
> The map outputs are not compressed for the in memory sort, even if
> mapred.compress.map.output is set. This can significantly increase the in
> memory size of the buffered outputs.
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