Apache Flink

Testing event-driven solutions is a challenging task. It includes:

• Common principles
• Unit testing: stateless and stateful
• Testing the Topology (I bet you didn’t do it! ;)
• Testing Schema Evolution and Compatibility
• Integration testing: Local, Remote and Hybrid - a set of common sense considerations not to forgot about
• Choosing the testing strategy

All of these is disclosed in the Chapter 15 of the book:

“Building Event-Driven Microservices: Leveraging Organizational Data at Scale” by Adam Bellemare

Heavyweight Stream Processing Frameworks are another foundation/pattern to build your microservices.

These frameworks are highly scalable and allow you to efficiently solve many analytical tasks. But they are not always good for stateful event-driven microservice application patterns.

Heavyweight frameworks operate using centralized resource clusters, which may require additional operational overhead, monitoring, and coordination to integrate successfully into a microservice framework. However, recent innovations move these frameworks toward container management solutions (CMS) such as Kubernetes that should reduce your efforts.