I noted that Apache Mesos is moving to the attic, so won't be actively developed soon: https://lists.apache.org/thread.html/rab2a820507f7c846e54a847398ab20f47698ec5bce0c8e182bfe51ba%40%3Cdev.mesos.apache.org%3E
That doesn't mean people will stop using it as a Spark resource manager soon. But it suggests the Spark + Mesos integration is a candidate for deprecation and eventual removal in Spark at some point. This is mostly an informal poll: are there Mesos users out there planning to continue using it for a while? moving off? just seeing if it's reasonable to even start deprecation in 3.2.0. Sean
