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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-3544) Ability to use SimpleRegeratingCode to fix missing blocks
Date Fri, 07 Oct 2016 20:32:21 GMT

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

Andrew Wang resolved HDFS-3544.
-------------------------------
    Resolution: Won't Fix

HDFS-RAID has been removed and native EC support is available at HDFS-7285. Closing as won't
fix.

> 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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