Hadoop® is used for distributed computing and can query large datasets based on its reliable and scalable architecture.
Two major components of Hadoop® are the Hadoop® Distributed File System (HFDS) and MapReduce.
Discuss atleastFOUR(4)overall roles of these two components, including their role during system failures. Two roles of each component.

text book:
EMC Education Service (Eds). (2015) Data Science and Big Data Analytics: Discovering, Analyzing, Visualizing, and Presenting Data, Indianapolis, IN: John Wiley & Sons, Inc