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