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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-503) Implement erasure coding as a layer on HDFS
Date Fri, 24 Jul 2009 07:36:14 GMT
Implement erasure coding as a layer on HDFS

                 Key: HDFS-503
                 URL: https://issues.apache.org/jira/browse/HDFS-503
             Project: Hadoop HDFS
          Issue Type: New Feature
            Reporter: dhruba borthakur
            Assignee: dhruba borthakur

The goal of this JIRA is to discuss how the cost of raw storage for a HDFS file system can
be reduced. Keeping three copies of the same data is very costly, especially when the size
of storage is huge. One idea is to reduce the replication factor and do erasure coding of
a set of blocks so that the over probability of failure of a block remains the same as before.

Many forms of error-correcting codes are available, see http://en.wikipedia.org/wiki/Erasure_code.
Also, recent research from CMU has described DiskReduce https://opencirrus.org/system/files/Gibson-OpenCirrus-June9-09.ppt.

My opinion is to discuss implementation strategies that are not part of base HDFS, but is
a layer on top of HDFS.

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