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From "Ramkumar Vadali (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2099) RaidNode should recreate outdated parity HARs
Date Thu, 30 Sep 2010 21:19:34 GMT
RaidNode should recreate outdated parity HARs
---------------------------------------------

                 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to be outdated.



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