Legacy environments can be complex and varied. To reduce risk in the upgrade or migration, there are some factors that you must consider during the planning process.
Upgrades are complex and have many prerequisites. Examples include:
There are also differences whether you are upgrading from CDH or HDP. The HDP process requires intermediate steps, such as upgrading and using Apache Ambari before converting to Cloudera Manager.
In order to mitigate risk in the upgrade or migration, you must consider data replication and protection before beginning the process. If a plan is not already in place, you can set up a multicluster replication scenario:
The upgrade or migration planning period is the ideal time to consider if you need, or could benefit from, a hardware upgrade.
Plan in terms of both capacity and performance by considering both: