Github user kwmonroe commented on the issue:
    I think you're saying the `namenode_hosts[host, index]` loop is the only 
difference, but that's a pretty big difference.  The hdfs-site.xml property 
keys are not the same in HA and non-HA cases.
    For example, property key in HA:
    `dfs.namenode.rpc-address.<%= @nameservice_id %>.nn<%= idx+1 %>`
    Same property key for non-HA:
    By the time we check for a single item list and have an `if/else` block 
rendering different properties based on that list size, I think we're no better 
than we are now.

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