One thing to note here, is that upstream mesos is working on removing Zookeeper as a dependency. That would at a minimum remove one of the three pieces.

Note that I briefly evaluated Chronos, but tossed it aside as a toy when realizing it didn't support any form of constraints. Aurora is a very nice scheduler for HA / distributed cron (with constraints!) and long running services.

It would be fantastic if Kyle would test out Aurora, if not only to break it so that upstream fixes it. He is generally successful in breaking ALL THE THINGS.