Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/1486#issuecomment-55638524
Added a few more comments after thinking about this some more. As it stands
the current factoring opens up a bunch of things at `private[spark]`
visibility. We always try to use the narrowest visibility possible and I think
it would be easy to change this to have only a single `private[spark]` function
call with a narrow interface.
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