Great comment on MapReduce

Spot on comment from Iván de Prado on the Database People Hating on MapReduce blog post.

I think this document is comparing things that are not comparable. They are talking about MapReduce as if it were a distributed database. But that's completely wrong. Hadoop is a distributed computed platform, not a distributed database prepared for OLAP.

MapReduce is a re-implementation of LISP's map and reduce in a parallel setting. Now the function/task that you give to Map is where the rubber meets the road of reading data from some data store.