Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/2649#issuecomment-58047851
The default FS on a federated HDFS would be something like
"viewfs://namespace"; so when deciding whether to upload files, the two URIs
would have that at the start, so compareFs would fail.
The actual NN you talk to only shows up when you actually try to open a
file (at which point the client library resolves the namespace + mount point),
or when you translate that URI into a qualified one (which is done later in the
method that calls compareFs()).
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