How to Build Event-Driven Architecture on AWS?

Building an event-driven architecture on AWS involves using various AWS services to create a system that responds to events in a decoupled and scalable manner. mazuzee.com

Awesome post ! , but I would like to know more about exception handling like 1 - what will happen if one service fails to process the event ? 2 - do you guys have any rollback mechanism if event fails ?

because rollback in event driven architecture really fascinates me !