Choose the Ambari "Services" tab.

In the Ambari "Actions" pulldown menu, choose "Add Service." This will start the Add Service Wizard. You'll see the Choose Services screen.

Select "Spark", and click "Next" to continue.

(Starting with HDP 2.2.4, Ambari will install Spark version 1.2.1, not 1.2.0.2.2.)

Ambari will display a warning message. Confirm that your cluster is running HDP 2.2.4 or later, and then click "Proceed".

	Note
	You can reconfirm component versions in Step 6 before finalizing the upgrade.

On the Assign Masters screen, choose a node for the Spark History Server.

Click "Next" to continue.

On the Assign Slaves and Clients screen, specify the machine(s) that will run Spark clients.

Click "Next" to continue.

On the Customize Services screen there are no properties that must be specified. We recommend that you use default values for your initial configuration. Click "Next" to continue. (When you are ready to customize your Spark configuration, see Apache Spark 1.2.1 properties.)

Ambari will display the Review screen.

	Important
	On the Review screen, make sure all HDP components are version 2.2.4 or later.

Click "Deploy" to continue.

Ambari will display the Install, Start and Test screen. The status bar and messages will indicate progress.

When finished, Ambari will present a summary of results. Click "Complete" to finish installing Spark.