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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