Supervision and Fault Tolerance

In concurrent applications, things can go wrong. An actor might crash, a network call might fail, or a database might be unreachable.

Fault tolerance is the ability of a system to continue operating correctly even when parts of it fail. Akka provides powerful mechanisms to achieve this.

Akka actors are organized in a hierarchy, much like a family tree. When an actor creates another actor, it becomes its parent.

• Parents are responsible for supervising their children.
• If a child actor fails, its parent receives a notification.
• The parent then decides how to handle the child's failure. This is called a supervision strategy.