Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/3326#issuecomment-63528137
@andrewor14 all the URIs you mention as not valid are actually valid.
- `file` scheme with authority is valid. It won't do anything useful in
most cases, but on Windows, for example, it might work (if it's pointing at an
SMB share)
- `hdfs` scheme with no host will probably default to `fs.defaultFS`, if I
remember correctly the HDFS code. (if the scheme matches, otherwise HDFS will
throw an exception)
- `///` means "default host", which is generally "localhost" but in HDFS
might be the above.
So those are all valid URIs, which is why no exception is thrown when you
construct the URI object.
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