QUESTION 4

a) Big Data is often characterised in the context of the 5 Vs. In your own words, evaluate these characteristics in the context of NoSQL databases providing concrete examples to support your answer.

b) Using an example, discuss how data is stored in the Hadoop Distributed File System (HDFS). In your discussion, evaluate the roles of the NameNode, the DataNode and the SecondaryNameNode in managing data in the Hadoop Cluster.

c) Explain how the NameNode knows when a DataNode fails. Discuss in your own words what actions it can take