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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] [Moved] (HDFS-3544) Ability to use SimpleRegeratingCode to fix missing blocks
Date Tue, 19 Jun 2012 01:22:46 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Scott Chen moved MAPREDUCE-3361 to HDFS-3544:
---------------------------------------------

    Component/s:     (was: contrib/raid)
                 contrib/raid
            Key: HDFS-3544  (was: MAPREDUCE-3361)
        Project: Hadoop HDFS  (was: Hadoop Map/Reduce)
    
> Ability to use SimpleRegeratingCode to fix missing blocks
> ---------------------------------------------------------
>
>                 Key: HDFS-3544
>                 URL: https://issues.apache.org/jira/browse/HDFS-3544
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: contrib/raid
>            Reporter: dhruba borthakur
>            Assignee: Weiyan Wang
>
> ReedSolomon encoding (n, k) has n storage nodes and can tolerate n-k failures. Regenerating
a block needs to access k blocks. This is a problem when n and k are large. Instead, we can
use simple regenerating codes (n, k, f) that does first does ReedSolomon (n,k) and then does
XOR with f stripe size. Then, a single disk failure needs to access only f nodes and f can
be very small.

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