Understanding Ambari architecture
Simple overview of the Ambari Server, Agents and Web architecture.
The Ambari Server collects data from across your cluster. Each host has a copy of the Ambari Agent, which allows the Ambari Server to control each host.
The Ambari Web UI periodically accesses the Ambari REST API, which resets the session timeout. Therefore, Ambari Web sessions do not timeout automatically by default. You can configure Ambari to timeout after a period of inactivity.