Hi, I think right now if you want to restart Impala Deamon - all queries on this daemon executing on this node (either as fragments or coordinators) fail. Right? Is there a way (or do you plan) to have safe-restart option?
It probably just needs to de-register from statestored (maybe it's safe) also there's 'impala-server.ready' option which can be marked as false and wait til all fragments/queries have finished (or times out) and then stops.
