Question-81: What all are the possible operations which can be done using Ambari Web UI?

Answer: Using Ambari web UI we can start/stop any specific service which is part of Hadoop cluster. And also many other administrative tasks can be completed like enabling Kerberos security.

Question-82: Can you please draw the block diagram for Apache Ambari?

Answer:

Question-83: Can you please explain the Ambari block diagram, you have created?

Answer: As you can see in the above diagram agents are installed all the nodes in the Hadoop cluster. Each agents responsibility is to collect the data from each node and send it to Ambari Server. And using this agent Ambari control the each server as well in the cluster.

Here Web UI is client-side browser based application made using the Java script which calls the Ambari REST API and get the cluster information. This all information is already saved on the Database of Ambari server. Its simple but powerful application.

Question-84: If Ambari server itself is not working and seems to be down, what can you do in that case?

Answer: If Ambari Server itself is down then we need to start it first and that we can do using the command line as below

ambari-server start

Question-85: How Ambari Admin page in WebUI is different than other web pages?

Answer: Suppose there are some tasks which are administrative and can or should only be done by the Administrator. And only Ambari Administrator can access the Ambari Admin pages. Example the tasks which only administrator can perform are.

• Creating a new Hadoop Cluster (We would be doing this in our Hadoop Administrator training check now)
• Managing the User, Group and their roles.
• Managing the version of the stack