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https://issues.apache.org/jira/browse/MAPREDUCE-2155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935587#action_12935587
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Patrick Kling commented on MAPREDUCE-2155:
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Review board entry for this patch: https://reviews.apache.org/r/120/

ant test-patch output:
{code}
     [exec] +1 overall.
     [exec]
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec]
     [exec]     +1 tests included.  The patch appears to include 14 new or 
modified tests.
     [exec]
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning 
messages.
     [exec]
     [exec]     +1 javac.  The applied patch does not increase the total number 
of javac compiler warnings.
     [exec]
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs 
(version 1.3.9) warnings.
     [exec]
     [exec]     +1 release audit.  The applied patch does not increase the 
total number of release audit warnings.
     [exec]
     [exec]     +1 system test framework.  The patch passed system test 
framework compile.
{code}

> RaidNode should optionally dispatch map reduce jobs to fix corrupt blocks 
> (instead of fixing locally)
> -----------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2155
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2155
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 0.23.0
>            Reporter: Patrick Kling
>             Fix For: 0.23.0
>
>         Attachments: MAPREDUCE-2155.patch
>
>
> 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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