Archive for September 2022

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).

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.

Basic Producer and Consumer (BPC) is a simple pattern for creating microservices. It forms the foundation of stateless and stateful services.

You can use it for:

• interfacing layer between event streams and legacy systems
• leverage external stream processing systems to augment capabilities.

But it requires your extra effort for:

• simple state materialization
• event scheduling
• timestamp-based decision making

All of these is disclosed in the Chapter 10 of the book we are currently studying:

Function-as-a-Service (FaaS) is an area of cloud computing that is growing rapidly.

There are following issues to conside here:

• Principles of FaaS
• Open source and 3rd party FaaS providers
• 4 components to consider when building microservices as functions
• Cold Start vs Warm Start
• Different Triggers that can start FaaS: Triggering Based on New Events, Triggering Based on Consumer Group Lag, Triggering on a Schedule, Triggering Using Webhooks, Triggering on Resource Events
• Maintaining State
• Two patterns of functions calling other functions: Event-driven and Direct-call
• Termination and Shutdown
• Tuning and Scaling

All of these is disclosed in the Chapter 9 of the book we are currently studying: