When having a controller-only node pool and trying to add a broker role to it, the operator / KafkaRoller seem to strugle to roll the nodes to change the configuration. It seems they try to treat the nodes as mixed nodes already, but fail to connect to them on the port 9091 as they are still controllers only.

It looks like the eventually roll them after the timeout expires. But it is not clear if they properly ensure the quorum availability during this. If nothing else, we have to check that this does not break the quorum -> but if possible, we should try to improve the process.

See the full log in the upstream issue.

Created by Strimzi#9434