Learning Akka (Video 20)

This video tutorial introduces the ACU cluster, explaining its fault-tolerant, decentralized nature using the gossip protocol and failure detector. It covers key concepts like nodes, cluster membership, and lifecycle. The tutorial guides viewers through building a cluster with front end and back end nodes, detailing the logic for each. It concludes with running the application and understanding logs, encouraging further exploration of ACU cluster documentation.

What protocol does the ACU cluster use to maintain its decentralized nature?

• SMTP

• Gossip

• FTP

• HTTP

What is the role of a leader node in an ACU cluster?

• To store all data

• To act as a single point of failure

• To handle all incoming requests

• To manage cluster convergence events

What state does a node enter when it first joins the cluster?

• Up

• Leaving

• Removed

• Joining

What happens to a node marked as unreachable in the ACU cluster?

• It is set to down when conditions are met

• It is ignored

• It is immediately removed

• It is promoted to leader

What is the first step in building an ACU cluster?

• Setting up a database

• Adding the ACU cluster jar to project dependencies

• Configuring the network

• Creating a user interface

How does the back-end node register itself with the front-end node?

• By restarting the system

• By sending a registration message

• By modifying a configuration file

• By updating a database

What happens if the front-end node receives an add message but has no back-end nodes?

• It forwards the message to another front-end

• It prints a service unavailable message

• It stores the message for later

• It processes the message itself