Learning Akka (Video 9)

This video tutorial covers supervision and monitoring in Akka. It explains the parent-child relationship in supervision, detailing how a parent actor handles failures in its child actors through various strategies like resuming, restarting, stopping, or escalating failures. The video also contrasts supervision with monitoring, where an actor monitors another to react to its termination. Coding examples demonstrate these concepts, using actors Aphrodite, Hera, Aries, and Athena. The tutorial concludes with a summary of the section and a preview of upcoming topics, including router actors and stateful actors.

What is the primary role of a parent actor in Akka's supervision model?

• To terminate all actors

• To send messages to child actors

• To handle failures of child actors

• To create new actors

Which of the following is NOT an option for a parent actor when a child actor fails?

• Escalate the failure

• Ignore the failure

• Restart the child

• Resume the child

In the 'one for one' supervision strategy, how does the parent actor respond to a child's failure?

• Applies the chosen action only to the failed child

• Ignores the failure

• Applies the chosen action to all children

• Escalates the failure to its own parent

What is the default supervision strategy in Akka?

• One for one

• One for all

• All for one

• None for all

How does monitoring differ from supervision in Akka?

• Monitoring reacts to actor termination

• Monitoring handles actor failures

• Monitoring reacts to actor creation

• Monitoring sends messages to actors

In the provided coding example, what action does the Aries actor take upon receiving a termination signal from Athena?

• Restarts Athena

• Ignores the signal

• Sends a message to Athena

• Stops itself

What lifecycle hook is implemented in the Aphrodite actor to understand its behavior during supervision?

• All of the above

• Pre-restart hook

• Post-stop hook

• Pre-start hook