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https://issues.apache.org/jira/browse/MAPREDUCE-2099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925619#action_12925619
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Scott Chen commented on MAPREDUCE-2099:
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+1 Besides the minor thing. The patch looks good for me.
> RaidNode should recreate outdated parity HARs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
> Attachments: MAPREDUCE-2099.2.patch, MAPREDUCE-2099.patch
>
>
> 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 are determined to be outdated.
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