You can review the Release Notes of Cloudera Runtime 7.1.5 for release-specific information related to new features and improvements, bug fixes, deprecated features and components, known issues, and changed features that can affect product behavior.

To upgrade from HDP 2.6.5 to CDP 7.1.5, you must migrate from HDP 2.6.5 to CDP 7.1.4 and then upgrade from CDP 7.1.4 to CDP 7.1.5. (HDP 2.6.5 --> CDP 7.1.4 --> CDP 7.1.5)