Not only is the algorithm described in the article complex for the simple task, but it is also incorrect. It has a single bottleneck: the grouper. It is interes

Not only is the algorithm described in the article complex for the simple task, but it is also incorrect. It has a single bottleneck: the grouper. It is interesting that I've been downmodded for providing a simpler but correct algorithm. (I don't know too much about MapReduce (almost nothing), but I like designing distributed algorithms for fun.)