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Microservicessystem_design~12 mins

First microservice architecture diagram in Microservices - Architecture Diagram

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System Overview - First microservice architecture diagram

This system is a simple microservice-based application. It splits the application into small services that each handle a specific task. The system must handle user requests efficiently and allow independent updates to each service.

Architecture Diagram
User
  |
  v
Load Balancer
  |
  v
API Gateway
  |
  +-------------------+-------------------+
  |                   |                   |
Service A          Service B           Service C
  |                   |                   |
Database A         Database B          Database C
  |                   |                   |
Cache A            Cache B             Cache C
Components
User
user
End user who sends requests to the system
Load Balancer
load_balancer
Distributes incoming user requests evenly across API Gateway instances
API Gateway
api_gateway
Routes requests to the correct microservice based on the request type
Service A
service
Handles a specific business function A
Service B
service
Handles a specific business function B
Service C
service
Handles a specific business function C
Database A
database
Stores data for Service A
Database B
database
Stores data for Service B
Database C
database
Stores data for Service C
Cache A
cache
Speeds up data access for Service A
Cache B
cache
Speeds up data access for Service B
Cache C
cache
Speeds up data access for Service C
Request Flow - 11 Hops
User → Load Balancer
Load Balancer → API Gateway
API Gateway → Service A
Service A → Cache A
Cache A → Service A
Service A → Database A
Database A → Service A
Service A → Cache A
Service A → API Gateway
API Gateway → Load Balancer
Load Balancer → User
Failure Scenario
Component Fails:Database A
Impact:Service A cannot write or read fresh data; cache may serve stale data
Mitigation:Use database replication for failover; cache serves stale data temporarily; alert system triggers for manual intervention
Architecture Quiz - 3 Questions
Test your understanding
Which component directs user requests to the correct microservice?
ALoad Balancer
BAPI Gateway
CCache
DDatabase
Design Principle
This architecture shows how microservices isolate business functions into separate services with their own databases and caches. The API Gateway centralizes routing, and the Load Balancer distributes traffic for scalability and availability.