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From "Ramkumar Vadali (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-2099) RaidNode should recreate outdated parity HARs
Date Wed, 27 Oct 2010 20:13:21 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ramkumar Vadali updated MAPREDUCE-2099:
---------------------------------------

    Status: Patch Available  (was: Open)

> RaidNode should recreate outdated parity HARs
> ---------------------------------------------
>
>                 Key: MAPREDUCE-2099
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2099
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/raid
>            Reporter: Ramkumar Vadali
>            Assignee: Ramkumar Vadali
>         Attachments: MAPREDUCE-2099.patch
>
>
> After parity files are archived into a parity HAR, a change in the source file does not
cause the HAR to be recreated. Instead, individual parity files are created for the modified
files but the HAR is not touched. This causes increased disk usage for parity data.
> The parity HAR could be recreated if a certain percentage of files in the HAR are determined
to be outdated.

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