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From "Ramkumar Vadali (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1171) RaidNode should fix missing blocks directly on Data Node
Date Fri, 21 May 2010 16:51:17 GMT
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

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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