If you’re a Lisper, the chances are that you understood the basics of Google’s map-reduce framework before you even read the paper. However, many people without a Lisp background find the ideas difficult to understand. Fortunately, if you fall into this group, Mathieu Blondel has you covered
“@fdevillamil: Genius. RT @mblondel_ml: Map-reduce explained in one picture http://t.co/CPgRUfnulZ” pic.twitter.com/a68QdlHd61
— Kenji Obata (@virtualkenji) August 8, 2014