Leader and Follower

Question 1

What’s a problem that introducing a quorum can cause?

Answer 1

Availability, as it requires multiple instances or nodes (to constitute a quorum) to be available instead of just one.

Question 2

What solves the availability problem in a quorum?

Answer 2

Using a leader-follower pattern where a single server (leader) is responsible for replicating data and coordinating work.

Question 3

What roles do the followers play within a leader-follower pattern?

Answer 3

Followers will only accept writes from the leader and serve as backups (during failure, a follower will be elected as leader).