FAQ
RaidNode should fix missing blocks directly on Data Node
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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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  • Ramkumar Vadali (JIRA) at Oct 25, 2010 at 8:44 pm
    [ 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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    This message is automatically generated by JIRA.
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    You can reply to this email to add a comment to the issue online.

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