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From "Rodrigo Schmidt (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-684) Use HAR filesystem to merge parity files
Date Tue, 15 Dec 2009 12:09:18 GMT

     [ https://issues.apache.org/jira/browse/HDFS-684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rodrigo Schmidt updated HDFS-684:
---------------------------------

    Attachment: HDFS-684.0.patch

Initial patch that enables the RaidNode to read from har files. It is missing the code to
create such files, though.

> Use HAR filesystem to merge parity files 
> -----------------------------------------
>
>                 Key: HDFS-684
>                 URL: https://issues.apache.org/jira/browse/HDFS-684
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: contrib/raid
>            Reporter: dhruba borthakur
>            Assignee: Rodrigo Schmidt
>         Attachments: HDFS-684.0.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. 

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