RaidNode should recreate outdated parity HARs
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                 Key: MAPREDUCE-2099
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2099
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: contrib/raid
            Reporter: Ramkumar Vadali
            Assignee: Ramkumar Vadali


After parity files are archived into a parity HAR, a change in the source file 
does not cause the HAR to be recreated. Instead, individual parity files are 
created for the modified files but the HAR is not touched. This causes 
increased disk usage for parity data.

The parity HAR could be recreated if a certain percentage of files in the HAR 
are determined to be outdated.



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