Junping Du created HDFS-4652:
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             Summary: Node with one topology layer should be handled as fault 
topology when NodeGroup layer is enabled
                 Key: HDFS-4652
                 URL: https://issues.apache.org/jira/browse/HDFS-4652
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 1.1.2
            Reporter: Junping Du
            Assignee: Junping Du


Currently, nodes with one layer topology are allowed to join in the cluster 
that with enabling NodeGroup layer which cause some exception cases. 
When NodeGroup layer is enabled, the cluster should assumes that at least two 
layer (Rack/NodeGroup) is valid topology for each nodes, so should throw 
exceptions for one layer node in joining.

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