hadoop-mapreduce-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "dhruba borthakur (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3361) Ability to use SimpleRegeratingCode to fix missing blocks
Date Sat, 05 Nov 2011 18:22:53 GMT
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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message