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From "Rodrigo Schmidt (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1491) Use HAR filesystem to merge parity files
Date Sun, 14 Feb 2010 05:02:28 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rodrigo Schmidt updated MAPREDUCE-1491:
---------------------------------------

    Status: Patch Available  (was: Open)

> 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
>            Reporter: Rodrigo Schmidt
>            Assignee: Rodrigo Schmidt
>         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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