I like events to EventBus a lot better. More Akka-style.
But then it would be nice if we could detect the actual diff ourselves so we can push out events like: Joined(x), Leaving(y), NewLeader(l) etc. WDYT?
Or should we stick to just two events: NodeRingChange(sortetSet) and MetaDataChange(..) - but with better names of course?

I think your suggestion is great. We should publish Domain Events. Publish to registered actors or event bus.

I think we can use it internally also. The Cluster extension API becomes the read side of a mini CQRS design.

Sounds great. Let's do it.
I think we should do it over the event bus (and remove the public add listener API and not allow adding actor listeners either). One way of doing things.

Most of this is done, but I'll also take a stab at publishing more fine grained events (the change only).

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