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From "Amr Awadallah (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1115) Support hierarchical pools of directories to use for intermediate MapReduce data files (for SSD drives)
Date Thu, 15 Oct 2009 05:38:31 GMT
Support hierarchical pools of directories to use for intermediate MapReduce data files (for
SSD drives)
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                 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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