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From "Chris Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3544) Ability to use SimpleRegeratingCode to fix missing blocks
Date Tue, 14 Jan 2014 23:19:23 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13871357#comment-13871357

Chris Li commented on HDFS-3544:

Okay, we're very interested in SRC in our clusters and we will work on this feature if we
can get some momentum. Either way I'll keep you posted.

> 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
> 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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