Upgrading CDH and Managed Services Using Cloudera Manager
Cloudera Manager 5 supports clusters running CDH 4 and CDH 5. To ensure the highest level of functionality and stability, consider upgrading to the most recent version of CDH.
The Cloudera Manager minor version must always be equal to or greater than the CDH minor version because older versions of Cloudera Manager may not support features in newer versions of CDH. For example, if you want to upgrade to CDH 5.4.8 you must first upgrade to Cloudera Manager 5.4 or higher.
Cloudera Manager 5.3 introduces an enhanced CDH upgrade wizard that supports major (CDH 4 to CDH 5), minor (CDH 5.x to 5.y), and maintenance upgrades (CDH a.b.x to CDH a.b.y). Both parcels and package installations are supported, but packages must be manually installed, whereas parcels are installed by Cloudera Manager. For an easier upgrade experience, consider switching from packages to parcels so Cloudera Manager can automate more of the process.
Depending on the nature of the changes in CDH between the old and new versions, the enhanced upgrade wizard performs service-specific upgrades that in the past you would have had to perform manually. When you start the wizard, notices regarding steps you must perform before upgrading to safeguard existing data that will be upgraded by the wizard.
If you use parcels, have a Cloudera Enterprise license, and have enabled HDFS high availability, you can perform a rolling upgrade that lets you avoid cluster downtime.