Github user massie commented on the pull request:
https://github.com/apache/spark/pull/7403#issuecomment-121776325
I just pushed an update (5c58b4df9b) which ensures that we keep binary
compatibility in `PairRDDFunctions`. The old `combineByKey` methods now call
into the new `combineByKey2` methods passing in a `null` for the combiner
`ClassTag`.
If this is an approach that is agreeable, I'll expand the tests and
finalize the work.
Any suggestions on a better name of the new combiner methods? I just called
it `combineByKey2` but I'll sure there's a better name.
Thanks for the review help @JoshRosen and @rxin.
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