reduceBy (original) (raw)

groupBy / reduceBy

Remi Forax forax at univ-mlv.fr
Sun Dec 9 09:29:11 PST 2012

On 12/09/2012 04:55 PM, Brian Goetz wrote:

the other problem with reduceBy is that the combiner is only needed for the parallel case but not for the serial one. Which is true for other nonhomogeneous reducer forms as well.

Yes, these reducers are ugly too :) I think it's better to specify a mapping function (T -> U) and a combiner (U, U -> U).

cheers, Rémi

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