[Aaronontheweb]

> Do Actor hierarchies imply a global registration mechanism?

No, all registration is done locally underneath the parent actor - i.e. if one parent creates three children, the only place where that state is registered is the parent itself. The root actor on each node can quickly figure out by traversing the tree whether or not a child at a given path exists or not.

The only exception to this convention are remote-deployed actors - if ActorSystem A deploys an actor remotely onto ActorSystem B, the RemoteDaemon (a system-level actor) keeps a record of who has actors deployed onto each other. That way if ActorSystem B dies (crash, network goes down, etc...) ActorSystem A can notify all of the local actors who depended on remote-deployed actors that those actors are effectively dead.