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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1491) Use HAR filesystem to merge parity files
Date Wed, 17 Feb 2010 03:32:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12834624#action_12834624
] 

Hudson commented on MAPREDUCE-1491:
-----------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #244 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-Mapreduce-trunk-Commit/244/])
    . The parity files created by the RAID are combined
using Hadoop Archive Files (HAR).  (Rodrigo Schmidt via dhruba)


> 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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