0
0
Microservicessystem_design~12 mins

API versioning for services in Microservices - Architecture Diagram

Choose your learning style9 modes available
LearnWhyDeepArchPracticeChallengeDesignRecallScale
System Overview - API versioning for services

This system manages multiple versions of APIs for microservices to ensure backward compatibility and smooth upgrades. It allows clients to specify which API version they want to use, enabling gradual migration and minimizing disruptions.

Architecture Diagram
User
  |
  v
Load Balancer
  |
  v
API Gateway (Version Router)
  |               |               |
  v               v               v
Service v1      Service v2      Service v3
  |               |               |
  v               v               v
Database       Database       Database
  ^               ^               ^
  |               |               |
Cache           Cache           Cache
Components
User
client
Sends API requests specifying desired version
Load Balancer
load_balancer
Distributes incoming requests evenly to API Gateway instances
API Gateway (Version Router)
api_gateway
Routes requests to the correct service version based on API version in request
Service v1
service
Handles API requests for version 1
Service v2
service
Handles API requests for version 2
Service v3
service
Handles API requests for version 3
Database
database
Stores persistent data for each service version
Cache
cache
Speeds up data retrieval for each service version
Request Flow - 11 Hops
User → Load Balancer
Load Balancer → API Gateway (Version Router)
API Gateway (Version Router) → Service vX (based on version)
Service vX → Cache
Cache → Service vX
Service vX → Database
Database → Service vX
Service vX → Cache
Service vX → API Gateway (Version Router)
API Gateway (Version Router) → Load Balancer
Load Balancer → User
Failure Scenario
Component Fails:API Gateway (Version Router)
Impact:All API requests fail to route to service versions, causing complete service outage.
Mitigation:Deploy multiple API Gateway instances behind the load balancer for redundancy and failover.
Architecture Quiz - 3 Questions
Test your understanding
Which component decides which service version handles the API request?
AAPI Gateway (Version Router)
BLoad Balancer
CCache
DDatabase
Design Principle
This architecture uses an API Gateway as a version router to direct client requests to the correct microservice version. This enables multiple API versions to coexist, supporting backward compatibility and smooth upgrades without disrupting users.