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From "Ramkumar Vadali (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HDFS-1171) RaidNode should fix missing blocks directly on Data Node
Date Mon, 25 Oct 2010 20:44:27 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ramkumar Vadali resolved HDFS-1171.
-----------------------------------

    Resolution: Invalid

Recreating this in Map/Reduce: MAPREDUCE-2150

> RaidNode should fix missing blocks directly on Data Node
> --------------------------------------------------------
>
>                 Key: HDFS-1171
>                 URL: https://issues.apache.org/jira/browse/HDFS-1171
>             Project: Hadoop HDFS
>          Issue Type: Task
>          Components: contrib/raid
>    Affects Versions: 0.20.1
>            Reporter: Ramkumar Vadali
>            Assignee: Ramkumar Vadali
>
> RaidNode currently does not fix missing blocks. The missing blocks have to be fixed manually.
> 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 has a RAID parity file, RaidNode identifies missing block(s)
in the file and recomputes the block(s) using the parity file and other good blocks
> 3. RaidNode sends the generated block contents to a DataNode
>    a. RaidNode chooses a DataNode with the most available space to send the block. 

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