Hi, My question is simple: could it be some performance issue using Accumulable/Accumulator instead of method like map() reduce()... ?
My use case : implementation of a clustering algorithm like k-means. At the begining I used two steps, one to asign data to cluster and another to calculate new centroids. After some research I use now an accumulable with an Array to calculate new centroid during the assigment of data. It's easier to unterstand and for the moment it gives better performance. It's probably because I used 2 steps before and now only one thanks to accumulable. So any indications against it ? Cheers, Julien
