Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/4634#issuecomment-76740039
If our language compatibility guideline mandate that all public RDD methods
should be in all languages, adding `combineByKey` I can't really argue against
adding it to Java.
That said, for the future, I think it's probably worth deprecating
`combineByKey` and adding any needed functionality to `aggregateByKey`. This
part probably makes sense in a different JIRA.
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