cc [~till.rohrmann] Stefan Richter
From my investigation currently Flink use SlotSharingManager and SlotSharingGroupId for achieving slot sharing. And thus SlotSharingGroupAssignment SlotSharingGroup and SharedSlot are all legacy concept.
Notice that the ongoing scheduler re-design touches frequently tests based on legacy slot/instance logic or even uses it for testing. I'd like to nudge this process for totally remove legacy code from our code base.
Also I attach a patch on
FLINK-12179 that remove Instance. With current contribution workflow your shepherds are significant :- )