Github user kwmonroe commented on the issue:
    @johnsca, `namenode_hosts` has only 1 item in non-HA mode.  Note that once 
we hit the `else` to enter the "non HA" condition, we're not in any loop -- 
`namenode_hosts[0]` is how the one and only namenode was being referenced in 
other parts of the template, so I kept it the same:

    Fwiw, I could use `@hadoop_namenode_host` if you think that would be 
    As for HA/Kerberos, I do not know why they are mutually exclusive; as you 
noted, I preserved the original logic.

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