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Microservicessystem_design~12 mins

When to revert to monolith in Microservices - Architecture Diagram

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System Overview - When to revert to monolith

This system explains when a software project using microservices should consider reverting back to a monolithic architecture. Key reasons include complexity overhead, deployment difficulties, and performance issues. The goal is to balance scalability with simplicity for maintainable and efficient development.

Architecture Diagram
User
  |
  v
Load Balancer
  |
  v
API Gateway
  |
  +---------------------+---------------------+
  |                     |                     |
Service A            Service B             Service C
  |                     |                     |
Database A           Database B            Database C
  |
Cache

-- Reverted Monolith Architecture --
User
  |
  v
Load Balancer
  |
  v
Monolithic Service
  |
  v
Single Database
  |
  v
Cache
Components
User
user
End user interacting with the system
Load Balancer
load_balancer
Distributes incoming requests evenly to backend services
API Gateway
api_gateway
Routes requests to appropriate microservices and handles cross-cutting concerns
Service A
service
Handles a specific business capability in microservices architecture
Service B
service
Handles another business capability in microservices architecture
Service C
service
Handles another business capability in microservices architecture
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
cache
Speeds up data access for frequently requested data
Monolithic Service
service
Single combined service handling all business logic after reverting
Single Database
database
Unified database storing all data in monolith
Request Flow - 18 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 → API Gateway
API Gateway → Load Balancer
Load Balancer → User
User → Load Balancer
Load Balancer → Monolithic Service
Monolithic Service → Cache
Cache → Monolithic Service
Monolithic Service → Single Database
Single Database → Monolithic Service
Monolithic Service → Load Balancer
Load Balancer → User
Failure Scenario
Component Fails:API Gateway
Impact:All requests to microservices fail, causing system downtime
Mitigation:Use multiple API Gateway instances with failover and health checks to avoid single point of failure
Architecture Quiz - 3 Questions
Test your understanding
Why might a team choose to revert from microservices to a monolith?
ATo reduce complexity and simplify deployment
BTo increase the number of databases
CTo add more load balancers
DTo separate business logic into more services
Design Principle
This architecture highlights the trade-off between microservices and monoliths. Microservices offer scalability and separation but add complexity and overhead. Reverting to a monolith can simplify deployment, reduce latency, and improve maintainability when the overhead outweighs benefits.