Chapter 3. Upgrading the HDP Stack from 1.3.2 or later to 2.1

The stack is the coordinated set of Hadoop components that you have installed. Use the following instructions to 1) upgrade a current, Ambari-installed and managed instance of a 1.3.2 or later version stack to a 2.1 version of the stack and 2) upgrade Ambari Server and Agents to 1.5.1 version. This procedure causes the upgraded stack to be managed by Ambari.

	Note
	If your stack has Kerberos Security turned on, you should turn it off before performing the upgrade. On Ambari Web->Admin view->Security-> click Disable Security. You can re-enable Security after performing the upgrade.

If you are upgrading from any other 1.x version of the stack, you must upgrade to 1.3.2 or later before you can upgrade to 2.1. See Upgrading the HDP Stack to 1.3.3 for more information. Upgrades from previous 1.x versions are not supported.

	Note
	If you have already upgraded to Ambari Server 1.5.1 and just want to upgrade the HDP stack, skip Section 2 and Section 3 and go directly to Section 4.