What is Apache Zookeeper?

Why do we need Zookeeper in the Hadoop?

How ZooKeeper in Hadoop Works?

What is Apache Ambari?

How is Ambari different from ZooKeeper?

Apache Ambari Architecture

Applications of Apache Ambari Core

Benefits of Using Apache Ambari

Explain MongoDB and it's Features.

What is grid computing? List and explain the features, drawbacks of grid computing.