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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2117) Superfast Distcp when copying data within the same hdfs cluster
Date Fri, 08 Oct 2010 05:39:32 GMT
Superfast Distcp when copying data within the same hdfs cluster
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                 Key: MAPREDUCE-2117
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2117
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: distcp
            Reporter: dhruba borthakur


There are use cases when distcp is used to copy a bunch of files/directories from one part
of the HDFS namespace to another part within the same HDFS cluster. It is superfast if we
can instruct relevant datanodes to make local replicas of relevant blocks and limit network
usage to a minimum. It is especially useful to make HBase take a backup of a region with minimum
downtime. 



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