Major Description
Currently, I can list a set of hosts upon which my job should schedule. However, there are some common-ish situations where I want to specify a list of hosts on which my job should never schedule. For instance, if I, as an application developer without administrative access to the aurora scheduler wish to avoid scheduling on a piece of hardware while I get the admins to drain it, or even if I know I trigger some specific kernel bug on a certain class of hardware.
I can see scenarios for racks as well (issues with the TOR), so it would make sense there as well.