Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4634#issuecomment-74705635
Ah, true that. Well, there's not much difference at all eh. `combineByKey`
is the lowest-level method and its separate utility is marginal; I suppose it
gives access to exactly these settings like map-side combine. It's public, for
better or worse, and doesn't do much harm other than taking up room in the API.
In the name of consistency it seems OK to make it available equally in the Java
API. If starting over, yeah, I'd question why both of these exist.
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