Before you begin

Before you begin a Data Lake upgrade, note the requirements and limitations listed below.

Requirements

Required role to perform Data Lake upgrade: EnvironmentAdmin or Owner over the environment
The Data Lake must be running and in a healthy state.
You should stop any Data Hubs and any data services (such as CDW or CDE) that are running. For the Cloudera Data Warehouse Experience, you should stop any Virtual Warehouses that are running prior to beginning any upgrade or backup/restore process. Stopping Experiences is not required for service pack upgrades, but any Data Hubs or data services that are not stopped will error out during the upgrade process.
If you use a custom image catalog and you don’t see upgrades available, you may need to update your custom image catalog with new images.
If the upgrade involves upgrading from CentOS to RHEL, review the Prerequisites for upgrading from CentOS to RHEL.
Expect at least two hours of downtime while the upgrade completes. Plan the upgrade during a time of low activity.
Optionally, you can take a backup of the Data Lake. The Data Lake upgrade process will automatically take a backup before the upgrade procedure begins, but you have the option of disabling the automatic backup if you would prefer to do this step separately. For instructions on performing a backup and restore, see Backup and restore for the Data Lake. If the upgrade fails for any reason, you can restore the Data Lake from the backup.
important
Even if you are using the automatic backup integrated with the Data Lake upgrade flow, verify that you have correctly configured the Data Lake backup process. Configuring the backup process includes granting the required permissions from the cloud provider side, and adding a RAZ policy for RAZ-enabled environments. See Configuring and running Data Lake backups for more information on required configurations for backup. You do not need to actually run the backup if you plan to use the auto-backup during a Data Lake upgrade.
For RAZ-enabled AWS environments, it is required that you manually add the RAZ backup policy for any AWS Data Lake created with a Runtime version prior to 7.2.15. However, for new environments created with a Data Lake running Runtime versions 7.2.15+, the RAZ backup policy is automatically configured for RAZ-enabled environments. If your Data Lake has been upgraded to 7.2.15 (as opposed to a new Data Lake created with 7.2.15), you will still have to manually add the RAZ backup policy.
For RAZ-enabled Azure environments, it is required that you manually add the RAZ backup policy for any Azure Data Lake created with a Runtime version prior to 7.2.14. However, for new environments created with a Data Lake running Runtime versions 7.2.14+, the RAZ backup policy is automatically configured for RAZ-enabled environments. If your Data Lake has been upgraded to 7.2.14+ (as opposed to a new Data Lake created with 7.2.14), you will still have to manually add the RAZ backup policy.

The upgrade requires 27 GB space on the CM server node and 20 GB on every other instance. If space is insufficient on your Data Lake, upgrade will not be permitted.

Limitations

Note the following limitations for the Data Lake upgrade:

Data Lake upgrade does not include the upgrade of the FreeIPA software or the operating system on the instance(s) running FreeIPA. To upgrade FreeIPA, see Upgrade FreeIPA.
Data Lake resizing (moving from a light duty to a medium duty Data Lake) during an upgrade is not supported.
If a Data Lake has attached Data Hubs that are not eligible for upgrade, the Data Lake itself is not eligible for upgrade. You must delete any Data Hubs that are ineligible for upgrade before proceeding with the Data Lake upgrade. See Data Hub Upgrade for more information about which Data Hubs are eligible for upgrade.
Service pack upgrades for RAZ-enabled Data Lakes are available only for Runtime versions 7.2.7+.
Major/minor version upgrades for RAZ-enabled Data Lakes are available only for Runtime versions 7.2.12+.
A Data Lake must be using Runtime 7.2.17 to be eligible for CentOS to RHEL upgrade. If you do not see the option to upgrade from CentOS to RHEL, ensure that your Data Lake is using Runtime 7.2.17.
Runtime 7.2.18 and newer do not support Medium Duty Data Lake shape and no upgrades are possible from 7.2.17 to 7.2.18 without doing a resize operation on the Data Lake prior to upgrading to 7.2.18.