Performing a Patch Upgrade
A patch release contains a unique software fix that affects one or more, but not all, services in your cluster. A four-digit release number identifies each patch release. Performing a patch upgrade applies changes only to those services in your cluster affected by the patch release.
![[Note]](../common/images/admon/note.png) | Note |
|---|---|
Applying a patch upgrade is supported only for clusters running HDP-2.6.4 and above. |
Prerequisites
Before performing a patch upgrade, you must obtain from Hortonworks Customer Support, the specific VDF file associated with the patch release.
Steps
Register the patch release as a target version, using the Add Version option, just as you would during any upgrade.
Patch versions include a "bug" icon to indicate that the patch includes a bug fix.
Install the patch release as the current version, just as you would during any upgrade.
Restart affected services.
When you perform a Patch Express Upgrade of a service, a dependent service may stop and require a manual restart. For example, a patch Express Upgrade of HDFS could stop HBase. In such cases, you must manually re-start HBase using the Ambari Web UI > Service Actions menu.
More Information
Limitation: Patch Upgrades in Mixed-OS Environments