title: Understanding Akka cluster sharding
body: <p>I'm learning Akka sharding module.
  There is something I don't understand abour Sharding.
  Let's imagine you want to shard an actor : you have many entites from the same actor distribued on many nodes.
  Each entity can have its own state, which may differ from another entity.</p>
  <p>A client is making a request (sending a message) to your shard actor to get back its status value. This is message is going to be processed by an entity and giving back its value as a result. But if it were treated by another entity the result would be different.
  But it should be the same because all entites derive from the same actor, shouldn'it ?</p>