Leon Gao created HDFS-15549:
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             Summary: Improve DISK/ARCHIVE movement if they are on same 
filesystem
                 Key: HDFS-15549
                 URL: https://issues.apache.org/jira/browse/HDFS-15549
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: datanode
            Reporter: Leon Gao
            Assignee: Leon Gao


When moving blocks between DISK/ARCHIVE, we should prefer the volume on the 
same underlying filesystem and use "rename" instead of "copy" to save IO.



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