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Posted to mapreduce-issues@hadoop.apache.org by "Scott Chen (JIRA)" <ji...@apache.org> on 2012/06/13 02:35:43 UTC

[jira] [Updated] (MAPREDUCE-3361) Ability to use SimpleRegeratingCode to fix missing blocks

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3361?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Scott Chen updated MAPREDUCE-3361:
----------------------------------

    Assignee: Weiyan Wang  (was: dhruba borthakur)

Assign to Weiyan because he is working on this now.
                
> Ability to use SimpleRegeratingCode to fix missing blocks
> ---------------------------------------------------------
>
>                 Key: MAPREDUCE-3361
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3361
>             Project: Hadoop Map/Reduce
>          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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