Once your target version has been registered into Ambari, installed on all hosts in the cluster and you meet the Prerequisites you are ready to perform an upgrade.
The perform upgrade process switches over the services in the cluster to a new version in a rolling fashion. The process follows the flow below. Starting with ZooKeeper and the Core Master components, ending with a Finalize step. To ensure the process runs smoothly, this process includes some manual prompts for you to perform cluster verification and testing along the way. You will be prompted when your input is required.
![[Important]](../common/images/admon/important.png) | Important |
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This process can take some time to complete. You should validate the upgrade process in a dev/test environment prior to performing in production, as well, plan a block of time to monitor the progress. And as always, be sure to perform backups of your service metadata (you will be prompted during the first-stages of the upgrade process). |
