For each minor release (for example, Domino 4.4 or 4.5), Domino performs a set of validation tests against the most recently released version of Apache Spark. The purpose of the tests is to cover the integration surface between the Domino platform and the on-demand Spark clusters that the platform orchestrates. The testing is not intended to be a comprehensive test of Spark, as Domino does not modify that software.
See the release notes for more information on the validated framework for each Domino version.