0
0
LLDsystem_design~12 mins

Why additional principles improve quality in LLD - Architecture Impact

Choose your learning style9 modes available
LearnWhyDeepArchPracticeChallengeDesignRecallScale
System Overview - Why additional principles improve quality

This system explains how applying additional design principles improves software quality. It highlights key principles like modularity, separation of concerns, and single responsibility to build maintainable, scalable, and robust systems.

Architecture Diagram
User
  |
  v
Load Balancer
  |
  v
API Gateway
  |
  v
+-------------------+
|  Service Layer     |
|  (Modular, SRP)    |
+-------------------+
  |
  v
+-------------------+      +----------------+
|  Database Layer    | <--> |  Cache Layer   |
|  (Separation of    |      |  (Performance) |
|   Concerns)        |      +----------------+
+-------------------+
Components
User
user
Initiates requests to the system
Load Balancer
load_balancer
Distributes incoming requests evenly to prevent overload
API Gateway
api_gateway
Routes requests to appropriate services and handles authentication
Service Layer
service
Implements business logic with modular design and single responsibility
Database Layer
database
Stores persistent data with separation of concerns from business logic
Cache Layer
cache
Speeds up data access by storing frequently used data
Request Flow - 11 Hops
User → Load Balancer
Load Balancer → API Gateway
API Gateway → Service Layer
Service Layer → Cache Layer
Cache Layer → Service Layer
Service Layer → Database Layer
Database Layer → Service Layer
Service Layer → Cache Layer
Service Layer → API Gateway
API Gateway → Load Balancer
Load Balancer → User
Failure Scenario
Component Fails:Cache Layer
Impact:Cache misses increase, causing more database queries and higher latency
Mitigation:System continues working by querying database directly; cache can be rebuilt asynchronously
Architecture Quiz - 3 Questions
Test your understanding
Which component ensures requests are evenly distributed to prevent overload?
ALoad Balancer
BAPI Gateway
CCache Layer
DService Layer
Design Principle
Applying additional principles like modularity, single responsibility, and separation of concerns improves system quality by making it easier to maintain, scale, and handle failures gracefully.