The whole idea is to break down the task into smaller tasks to the point where the task is granular and structured enough to be performed by one actor. Each actor knows which kind of message it will process and how he reacts in terms of failure. So, if the actor does not know how to handle a particular message or an abnormal runtime behavior, the actor asks its supervisor for help. The recursive actor hierarchy allows the problem to be propagated upwards to the point where it can be handled. Remember, every actor in Akka has one and only one supervisor.
Every actor has only one supervisor.
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