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https://issues.apache.org/jira/browse/MAPREDUCE-1115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved MAPREDUCE-1115.
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Resolution: Won't Fix
> Support hierarchical pools of directories to use for intermediate MapReduce
> data files (for SSD drives)
> -------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1115
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1115
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: tasktracker
> Reporter: Amr Awadallah
> Priority: Minor
>
> Some initial benchmarking shows that SSDs can help a lot for local data files
> (for shuffle and other intermediate files).
> Currently mapred.local.dir just round-robins over the provided directories,
> it would be nice to allocate a set of SSD directories to round-robin across
> first, then spill over to normal drives if the SSD directories are full.
> -- amr
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