Github user massie commented on the pull request:
https://github.com/apache/spark/pull/7403#issuecomment-123917486
This is ready for review when someone has the time. All unit tests pass.
* Only classes marked `@DeveloperApi` or are `private[spark]` have been
altered to include ClassTags (breaking compatibility)
* The `PairRRDFunctions` have three new `sortByKeyWithClassTag` methods
that mirror the original `sortByKey` signatures
* All calls to `sortByKey` have been moved to `sortByKeyWithClassTag`. Only
users that call `sortByKey` directly will not have combiner class type
information provided to the shuffle.
* I've added a warning message when `sortByKey` is used
* As an aside, I wrote the code to use the `implicit` trick I talked about
and it turned out to complicate the code quite a lot.
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