Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3366#issuecomment-65019636
> @JoshRosen We already have this in Scala/Java.
What about `reduceByKey`? I don't see a variant with a flag for disabling
map-side combining:
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala#L262.
We definitely have the `mapSideCombine` option for `combineByKey` but not for
`reduceByKey`.
I guess I kind of pattern-matched on the `reduceByKey` in my earlier
comment; the `combineByKey` flag makes sense and we should definitely include
that for feature-parity.
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