Github user mccheah commented on the pull request:
https://github.com/apache/spark/pull/4634#issuecomment-74580824
groupBy and reduceByKey in the Scala API are actually just convenience
methods that call through to combineByKey with parameters that make sense.
Given that, perhaps just having the single 6-parameter method in the Java API
makes sense. combineByKey will be used when customization/configuration is
required beyond what reduceByKey and groupBy offers (but those latter two
methods exist for convenience and readability, and rightly so).
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