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https://issues.apache.org/jira/browse/HADOOP-590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen O'Malley resolved HADOOP-590.
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Resolution: Duplicate
I believe this was fixed already.
> Reducer's pass merger should utilize temporary directories on different disks
> -----------------------------------------------------------------------------
>
> Key: HADOOP-590
> URL: https://issues.apache.org/jira/browse/HADOOP-590
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Reporter: Runping Qi
> Assignee: Owen O'Malley
>
> The current implementation of pass merge of SequenceFile class uses the same
> temp directory for the in/out files of the pass merger class, even though
> when multiple temp dirs are available. Thus, it cannot fully utlize the
> advantage of multiple disks during sort.
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