The stack is the coordinated set of Hadoop components that you have installed. If you have a current instance of the 1.2.0/1.2.1 stack that was installed and managed by Ambari that you want to upgrade to the current 1.3.3 version of the stack and to also upgrade to the 1.2.5 version of Ambari Server and Agents, use the following instructions. This insures that the upgraded stack can still be managed by Ambari.
If you are upgrading from the 1.3.0 stack to the 1.3.3 stack, use Section 5: Upgrading the Stack (from 1.3.0 to 1.3.3), not Section 4: Upgrading the Stack (from 1.2.* to 1.3.3).
![[Note]](../common/images/admon/note.png) | Note |
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If you have already upgraded to Ambari Server 1.2.5 and just want to upgrade the HDP stack, you can skip Sections 9.2 and 9.3. |
