Chris Nauroth created HDFS-4269:
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             Summary: DatanodeManager#registerDatanode rejects all datanode 
registrations from localhost in single-node developer setup
                 Key: HDFS-4269
                 URL: https://issues.apache.org/jira/browse/HDFS-4269
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: trunk-win
            Reporter: Chris Nauroth
            Assignee: Chris Nauroth


HDFS-3990 is a change that optimized some redundant DNS lookups.  As part of 
that change, {{DatanodeManager#registerDatanode}} now rejects attempts to 
register a datanode for which the name has not been resolved.  Unfortunately, 
this broke single-node developer setups on Windows, because Windows does not 
resolve 127.0.0.1 to "localhost".

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