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Posted to hdfs-dev@hadoop.apache.org by "Andrew Wang (JIRA)" <ji...@apache.org> on 2016/10/07 20:32:21 UTC
[jira] [Resolved] (HDFS-3544) Ability to use SimpleRegeratingCode
to fix missing blocks
[ 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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