RaidNode should optionally dispatch map reduce jobs to fix corrupt blocks 
(instead of fixing locally)
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                 Key: MAPREDUCE-2155
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2155
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
            Reporter: Patrick Kling


Recomputing blocks based on parity information is expensive. Rather than doing 
this locally at the RaidNode, we should run map reduce jobs. This will allow us 
to quickly fix a large number of corrupt or missing blocks.

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