For anyone who would like to study more about handling with large datasets, you must take a look at the classes resources of Stanford University.
One is the Mining Massive Datasets, that discusses methods and algorithms for mining massive data sets. There are lots of resources including special topics about Recommender Systems.
The second one is the course Project in Mining Massive Datasets , which will focus on a real project
using large scale data mining techniques and research projects. The slides provide several examples using the Amazon EC2 computing cluster with massive MapReduce Jobs.
I extremely recommend both content material, since there are a scarse volume of materials about those topics in a easy-learning way to study!