[silasiba]

Cool feature!

I have a concern, if the Kafka broker provide both coordination service and Kafka service, how to achieve the resource isolation? If some of the topic which on the coordination service with very high throughput, this must cause instability of the coordination service, could this further cause the instability of the entire cluster?

If some of the broker only provide the coordination service, what is this essential difference? Will this cause more problems for expansion and contraction? Will this bring greater risks when users scale down the brokers? I am very afraid that the coordination service will be shut down due to careless operation.

[mumrah]

Part of the new design is that brokers and controllers can be run on separate JVMs.

[silasiba]

Yes, that my second concern. If run on separate JVM, what is the difference between use ZK and use controller? Of course, If the new controller is more stable than ZK, more efficient than ZK, this will bring benefits to users. But this is essentially replacing zk with a better product, I think etcd also can achieve this purpose.