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https://issues.apache.org/jira/browse/MAPREDUCE-1491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12835270#action_12835270
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Hudson commented on MAPREDUCE-1491:
-----------------------------------
Integrated in Hadoop-Mapreduce-trunk #239 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-Mapreduce-trunk/239/])
> Use HAR filesystem to merge parity files
> -----------------------------------------
>
> Key: MAPREDUCE-1491
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1491
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: contrib/raid
> Reporter: Rodrigo Schmidt
> Assignee: Rodrigo Schmidt
> Fix For: 0.22.0
>
> Attachments: MAPREDUCE-1491.0.patch
>
>
> The HDFS raid implementation (HDFS-503) creates a parity file for every file
> that is RAIDed. This puts additional burden on the memory requirements of the
> namenode. It will be nice if the parity files are combined together using
> the HadoopArchive (har) format.
> This was (HDFS-684) before, but raid migrated to MAPREDUCE.
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