First I would like to say that I am very new to Akka and actors :)
I would like to create a distributed application. I will split the application in a web part(REST API) and a user management part. But what is the right way to access an actor from another part of the application?
I know that I can access an actor selection by providing its address (https://doc.akka.io/docs/akka/2.5/remoting.html#looking-up-remote-actors), but isn't there a way where I don't have to work with addresses?
I just want to create a system where it is very easy to reach a remote actor without using their addresses.
In Cluster Sharding the actor identity is persistanceId and must be part of message which you send to whole cluster. Thats why you need to define extractEntityId.
Read more in documentation: https://doc.akka.io/docs/akka/2.5/cluster-sharding.html