r³ is a map-reduce engine written in python using redis as a backend View project onGitHub r³ r³ is a map reduce engine written in python using a redis backend. It's purpose is to be simple. r³ has only three concepts to grasp: input streams, mappers and reducers. The diagram below relates how they interact: If the diagram above is a little too much to grasp right now, don't worry. Keep reading an