Archive for November 2022

A very short Chapter 2 is about how to make rough estimates to start from the most important parts when designing the software.

Some concepts that EVERY software developer should know:

• “Power of two”
• Standard latency numbers! How fast is memory, how slow is disk, etc…
• Availability numbers
• What are key metrics you should think about

These concepts and numbers are disclosed in chapter two of the book:

“System Design Interview – An insider’s guide” by Alex Xu

A great generic plan for scaling any app from zero to millions of users.

• Single server setup
• Selection and usage of database
• Vertical scaling vs horizontal scaling approaches. And why you should prefer horizontal
• Adding load balancer for horizontal scaling
• Adding database replication for horizontal scaling
• Adding cache
• Adding CDN
• Stateless vs Stateful architecture and using external state storage
• Adding extra Data Centers
• Adding Message queue
• Adding Logging, Metrics, and Automation
• Scaling database (sharding)
• and futher steps…

All of these is carefully but briefly disclosed in the Chapter 1 of the book:

Principles of Microservice Deployment Differentes between Continuous integration (CI), Continuous delivery and Continuous deployment. Deployment patterns:

• The Basic Full-Stop Deployment Pattern
• The Rolling Update Pattern
• The Breaking Schema Change Pattern: two options here - Eventual Migration and Synchronized Migration
• The Blue-Green Deployment Pattern

All of these is disclosed in the Chapter 16 of the book:

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

Sharing my mind map with all the details as usual:

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