In Map and Reduce Library, user code is only required for mapping and reduce function. The platform will shuffle and rearrange data order to make the upcoming reduce process extremely fast. This also reduces a lot of development work. For further boosting, the shuffle part can be rewritten to boost up the speed.  The original source code is [https://github.com/GoogleCloudPlatform/appengine-mapreduce/blob/master/java/example/src/com/google/appengine/demos/mapreduce/randomcollisions/CollisionFindingServlet.java here]. [[File:MPL.png|200px]]