The Hadoop Service Layer
The test mapped to this layer closely tracks login attempts to the NameNode in a Hadoop cluster and alerts administrators to consistent authentication failures. In the process, the test sheds light on improper Kerberos configuration or suspicious login activity on the storage. Additionally, the test measures the average time taken by successful and failed logins, thus pointing administrators to authentication delays that may be spoiling user experience with Hadoop storage.
Figure 1 : The test mapped to the Hadoop Service layer