Congratulations. We just published Spark 1.6 technical preview (http://hortonworks.com/hadoop-tutorial/apache-spark-1-6-technical-preview-with-hdp-2-3/)
Please take it out for a spin.
This tutorial skipped one set of instructions to eliminate use of Yarn HistoryServer. These are the required steps:
Ensure “spark-defaults.conf” doesn’t have any YARN history service related properties enabled.
If this tech preview is installed on a node where Spark was already there, there may be Spark properties set related to YARN ATS. Make sure you have disabled the following properties in your “spark-defaults.conf” file by adding a '#' in front of each setting.