Event Broker

The 4th pattern to build microservices is to use Lightweight Frameworks.

Lightweight Frameworks provide similar functionality to Heavyweight Frameworks, but they heavily rely on:

• the event broker
• the container management system (CMS)

In many cases they exceed Heavyweight Frameworks.

Different apps can use any/different resources from the cluster which are better fit their needs. While still provide Scaling and Recovering from Failures (again by heavily relying on event broker and CMS).

Introduction into Event-driven microservice (EDM) architecture consists of the following topics:

• two topologies
• content of events
• three types of events
• table-stream duality
• schemas for defining event data
• single writer principle
• features of event broker
• event broker vs message broker
• single source of truth principle
• scaling using containers and VMs
• microservice taxes that we should pay

These topics are disclosed in the Chapter 2 of the book we are currently studying: