There are different options how to activate kerberos in Hadoop cluster.Read more
Kerberos authentication protocol is needed to secure Hadoop cluster. This is the only way to make Hadoop cluster secure.Read more
Here we explain concepts behind activation of security in Hadoop cluster.Read more
Why do you need HDFS (Hadoop Distributed Files System)? If the amount of data is small and place on your computer is enough for this, then you do not need distributed file system. But if you like to process a large amount of data, which is not possible to save on one computer, then you need to think about distributed file system.