> you have the application call the zookeeper service to get those configuration changes. as a note, both ZK and etcd have key watches such that one need not p

> you have the application call the zookeeper service to get those configuration changes. as a note, both ZK and etcd have key watches such that one need not poll the key-value store, it'll push out notifications for changes to subscribers, making for super quick reactions in any such distributed applications