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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-684) Use HAR filesystem to merge parity files
Date Tue, 24 Nov 2009 11:52:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12781883#action_12781883
] 

dhruba borthakur commented on HDFS-684:
---------------------------------------

Hi Rodrigo, thanks for the info. I guess it is mostly the case that all files in a directory
are likely to get updated together. That helps in creating a single raid out of them.

> 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
>
> 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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