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From "Scott Chen (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3361) Ability to use SimpleRegeratingCode to fix missing blocks
Date Mon, 07 Nov 2011 17:58:53 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145652#comment-13145652
] 

Scott Chen commented on MAPREDUCE-3361:
---------------------------------------

Here is the paper of SimpleRegenerating Code.
http://arxiv.org/pdf/1109.0264
                
> 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: dhruba borthakur
>
> 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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