Changelog

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).

Event-Driven Microservices need to materialize states. And it comes with the important things to think about. Two approaches to choose from:

• Internal state store
• or External state store

Both have pros and cons. Both have important scalability and recovery considerations.

Two approaches for changing data structures:

• Bebuilding
• and Migration

Transactions and how to emulate them in order to implement Effectively Once processing.

All of these is disclosed in the Chapter 7 of the book we are currently studying: