Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/3326#issuecomment-63536391
I see. By "valid" here we mean it provides the scheme, the path and the
authority. However, when you do two-slashes on `file:`, it actually interprets
it differently from what I would otherwise assume.
```
scala> new URI("file:/path/to/my.jar").getPath
res9: String = /path/to/my.jar
scala> new URI("file://path/to/my.jar").getPath
res10: String = /to/my.jar
```
I suppose then it is the user's responsibility to not make this mistake. We
can't prevent this because "path" could be a valid authority or hostname here
and we won't be able to tell the difference.
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