Github user massie commented on the pull request:
https://github.com/apache/spark/pull/7403#issuecomment-127752526
@rxin I look forward to your comment.
* This PR only adds `ClassTag`s to the following `@DeveloperApi` classes:
`Dependency`, `CoGroupedRDD`, and `ShuffledRDD`.
* The existing methods in `PairRDDFunctions` have not been changed,
instead, there are three new `sortByKeyWithClassTag` methods that mirror the
original `sortByKey` signatures
* All calls to `sortByKey` by higher-level APIs have been moved to
`sortByKeyWithClassTag`. Only users that call `sortByKey` directly will not
have combiner class type information provided to the shuffle. (And it's easy
for shuffle implementation to handle that however they choose)
According [to the source for
DeveloperApi](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/annotation/DeveloperApi.java#L23),
a Developer API is unstable and can change between minor releases.
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