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Microservicessystem_design~12 mins

Microservices maturity model - Architecture Diagram

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System Overview - Microservices maturity model

The Microservices Maturity Model describes the stages of growth and sophistication in a microservices architecture. It helps teams understand how to evolve from a simple, monolithic-like service to a fully mature, scalable, and resilient microservices system.

Key requirements include modularity, independent deployment, scalability, fault tolerance, and efficient communication between services.

Architecture Diagram
User
  |
  v
[API Gateway]
  |
  v
+---------------------+     +---------------------+     +---------------------+
|  Service Level 1     | --> |  Service Level 2     | --> |  Service Level 3     |
|  (Monolith-like)     |     |  (Basic Microservices)|     |  (Decoupled Services)|
+---------------------+     +---------------------+     +---------------------+
                                   |                           |
                                   v                           v
                          +---------------------+     +---------------------+
                          |  Service Level 4     | --> |  Service Level 5     |
                          |  (Resilient & Scalable)|   |  (Optimized & Secure)|
                          +---------------------+     +---------------------+
Components
User
actor
Initiates requests to the system
API Gateway
gateway
Routes user requests to appropriate microservices and handles cross-cutting concerns
Service Level 1 (Monolith-like)
service
Single service with tightly coupled components, minimal modularity
Service Level 2 (Basic Microservices)
service
Services split by business capability but with synchronous communication
Service Level 3 (Decoupled Services)
service
Services communicate asynchronously, loosely coupled
Service Level 4 (Resilient & Scalable)
service
Services implement fault tolerance, auto-scaling, and health checks
Service Level 5 (Optimized & Secure)
service
Services have optimized performance, security, and observability
Request Flow - 8 Hops
User → API Gateway
API Gateway → Service Level 1 (Monolith-like)
API Gateway → Service Level 2 (Basic Microservices)
Service Level 2 (Basic Microservices) → Service Level 3 (Decoupled Services)
Service Level 3 (Decoupled Services) → Service Level 4 (Resilient & Scalable)
Service Level 4 (Resilient & Scalable) → Service Level 5 (Optimized & Secure)
Service Level 5 (Optimized & Secure) → API Gateway
API Gateway → User
Failure Scenario
Component Fails:API Gateway
Impact:All user requests fail because no routing to services is possible; system is unavailable
Mitigation:Deploy multiple API Gateway instances behind a load balancer for high availability
Architecture Quiz - 3 Questions
Test your understanding
Which component routes user requests to the appropriate microservice?
AUser
BAPI Gateway
CService Level 1
DService Level 5
Design Principle
The Microservices Maturity Model guides teams to evolve from tightly coupled monolithic services to fully decoupled, resilient, and optimized microservices. Key principles include modularity, asynchronous communication, fault tolerance, and observability to build scalable and maintainable systems.