Hdfs Federation: The BPOfferService must always connect to namenode as the 
login user.
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                 Key: HDFS-1755
                 URL: https://issues.apache.org/jira/browse/HDFS-1755
             Project: Hadoop HDFS
          Issue Type: Sub-task
    Affects Versions: Federation Branch
            Reporter: Jitendra Nath Pandey
            Assignee: Jitendra Nath Pandey
             Fix For: Federation Branch


  The BPOfferService thread when started, normally connects to the namenode as 
the login user. But in case of refreshNamenodes a new BPOfferService may be 
started in the context of an rpc call where the user is dfsadmin. In such a 
case the connection to the namenode will fail. 

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