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How to tame event-driven microservices

Modern microservices architectures are event-driven, reactive, and choreographed (as opposed to being centrally controlled via an orchestrator). That makes them loosely coupled and easy to change. Right? 

TL;DR: Not so easy! You will face challenges around understanding and managing the flow of events.

In this article I summarize my experience with choreographed microservices and look at various consequences and challenges of this approach. I use the typical business example of customer on-boarding (depending on the industry, this may be familiar to you as account opening). I use Apache Kafka to represent the event bus in the pictures below, but don’t worry if you run a different stack. The same concepts still apply.

Choreographed microservices

Let’s assume the following services and events form your choreographed system: 


Figure 1. Event-driven microservices forming a choreography.

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