Yes I am thinking of page rank, but I need to first know the basics so I need to start somewhere !! and hoped for a resource
If resources are what you were expecting, Coursera used to have a course named "Mining massive datasets" that covers some of the topics I saw you mentioning in your comments (MapReduce, HDFS, PageRank etc). It was ministered by Jure Leskovec, Anand Rajaraman and Jeffrey D. Ullman.
Although the course itself is not available anymore, the video lectures are still on Youtube, and a quick search returned me the following playlist: https://www.youtube.com/playlist?list=PLLssT5z_DsK9JDLcT8T62...
If you want some reading material by the same people, you should also check this book: http://infolab.stanford.edu/~ullman/mmds/book.pdf