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Microservicessystem_design~12 mins

Integration testing in Microservices - Architecture Diagram

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System Overview - Integration testing

This system demonstrates integration testing in a microservices environment. It ensures that multiple services work together correctly by simulating real user requests flowing through the system. Key requirements include verifying communication between services, data consistency, and error handling across service boundaries.

Architecture Diagram
User
  |
  v
Load Balancer
  |
  v
API Gateway
  |
  +---------------------+
  |                     |
  v                     v
Service A             Service B
  |                     |
  v                     v
Database A            Database B
  |
  v
Cache
Components
User
client
Initiates requests to the system
Load Balancer
load_balancer
Distributes incoming requests evenly to API Gateway instances
API Gateway
api_gateway
Routes requests to appropriate microservices and handles authentication
Service A
service
Handles part of the business logic and communicates with Database A
Service B
service
Handles another part of business logic and communicates with Database B
Database A
database
Stores data related to Service A
Database B
database
Stores data related to Service B
Cache
cache
Speeds up data retrieval for frequently accessed data
Request Flow - 14 Hops
User → Load Balancer
Load Balancer → API Gateway
API Gateway → Service A
Service A → Cache
Cache → Service A
Service A → Database A
Database A → Service A
Service A → Service B
Service B → Database B
Database B → Service B
Service B → Service A
Service A → API Gateway
API Gateway → Load Balancer
Load Balancer → User
Failure Scenario
Component Fails:Database A
Impact:Service A cannot retrieve or store data, causing partial failure in response. Cache may serve stale data but writes fail.
Mitigation:Use database replication for failover. Service A returns error message or degraded response. Cache serves read requests if data is available.
Architecture Quiz - 3 Questions
Test your understanding
Which component routes user requests to the correct microservice?
AAPI Gateway
BLoad Balancer
CCache
DDatabase
Design Principle
This architecture shows how integration testing verifies communication and data flow between multiple microservices, databases, and caches. It highlights the importance of routing, caching, and fallback mechanisms to ensure system reliability and correctness.