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Chris Li commented on HDFS-3544: -------------------------------- Any updates on this issue? We're interested in trying this out to save space on our cold files. > 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 > Assignee: Weiyan Wang > > 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 was sent by Atlassian JIRA (v6.1.5#6160)