I have doubts now.

controller.port

is used to generate a helix instance id in combination with

controller.host

. I assume that a migration path shouldn’t involve changing the instance id. This means that either controller.port is reused for https after http is turned of. Or the instance id generation dynamically picks between the http and https port. If a controller changes his helix id and present itself with the same data dir to ZK, is it a big deal for the data consistency?