After taking snapshot (upgrade) on Federation,  the current directory of data 
node is emtpy.
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                 Key: HDFS-1881
                 URL: https://issues.apache.org/jira/browse/HDFS-1881
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Tanping Wang
            Assignee: Tanping Wang


After taking a snapshot in Federation (by starting up namenode with option 
-upgrade), it appears that the current directory of data node does not contain 
the block files.  We have also verified that upgrading from 20 to Federation 
does not have this problem.

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