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Microservicessystem_design~12 mins

Why inter-service communication defines architecture in Microservices - Architecture Impact

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System Overview - Why inter-service communication defines architecture

This system shows how microservices communicate with each other to fulfill user requests. The way services talk defines the system's structure, performance, and reliability. Key needs include clear communication paths, fault tolerance, and scalability.

Architecture Diagram
User
  |
  v
Load Balancer
  |
  v
API Gateway
  |
  +---------------------+
  |                     |
  v                     v
Service A <-----> Service B
  |                     |
  v                     v
Database A           Database B
  ^                     ^
  |                     |
Cache A               Cache B
Components
User
user
Initiates requests to the system
Load Balancer
load_balancer
Distributes incoming requests evenly to API Gateway instances
API Gateway
api_gateway
Entry point that routes requests to appropriate microservices
Service A
service
Handles specific business logic and communicates with Service B
Service B
service
Handles another business domain and collaborates with Service A
Database A
database
Stores data related to Service A
Database B
database
Stores data related to Service B
Cache A
cache
Speeds up data access for Service A
Cache B
cache
Speeds up data access for Service B
Request Flow - 16 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 → Service B
Service B → Cache B
Cache B → 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:Service B
Impact:Service A cannot get data from Service B, causing partial failure or delay in response.
Mitigation:Implement retries, fallback responses, or circuit breaker patterns to handle Service B failure gracefully.
Architecture Quiz - 3 Questions
Test your understanding
Which component first distributes user requests to the system?
ALoad Balancer
BAPI Gateway
CService A
DCache A
Design Principle
Inter-service communication shapes the system's architecture by defining how services depend on each other. Clear communication paths enable scalability and fault tolerance, while poor design can cause delays or failures. Using caches, databases, and gateways properly ensures efficient and reliable data flow.