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From "Ramkumar Vadali (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-2150) RaidNode should periodically fix corrupt blocks
Date Tue, 26 Oct 2010 07:17:20 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ramkumar Vadali updated MAPREDUCE-2150:
---------------------------------------

    Attachment: MAPREDUCE-2150.patch

This patch uses DFSck to get a list of corrupt files periodically and fixes source/parity/parity-har
blocks automatically.

> RaidNode should periodically fix corrupt blocks
> -----------------------------------------------
>
>                 Key: MAPREDUCE-2150
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2150
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/raid
>            Reporter: Ramkumar Vadali
>            Assignee: Ramkumar Vadali
>         Attachments: MAPREDUCE-2150.patch
>
>
> (Recreating HDFS-1171 since RAID is in mapreduce)
> RaidNode currently does not fix missing blocks. The missing blocks have to be fixed using
RaidShell.
> This task proposes that recovery be more automated:
> 1. RaidNode periodically fetches a list of corrupt files from the NameNode
> 2. If the corrupt files can be fixed using RAID, it should generate the block.
> 3. Choose a datanode and send the block contents along with checksum to the datanode.

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