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HLDsystem_design~12 mins

Why understanding protocols enables design decisions in HLD - Architecture Impact

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System Overview - Why understanding protocols enables design decisions

This system explains how knowing communication protocols helps architects make better design choices. It shows how protocols affect data flow, reliability, and scalability in a networked system.

Architecture Diagram
User
  |
  v
Load Balancer
  |
  v
API Gateway
  |
  v
Service Layer
  |
  +-----> Message Queue
  |          |
  |          v
  |       Worker Service
  |
  v
Database
  |
  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
Handles protocol translation, authentication, and routes requests to services
Service Layer
service
Processes business logic and communicates with other components
Message Queue
queue
Enables asynchronous communication between services
Worker Service
service
Processes background tasks from the message queue
Database
database
Stores persistent data
Cache
cache
Stores frequently accessed data to reduce database load
Request Flow - 12 Hops
User → Load Balancer
Load Balancer → API Gateway
API Gateway → Service Layer
Service Layer → Cache
Cache → Service Layer
Service Layer → Database
Database → Service Layer
Service Layer → Message Queue
Message Queue → Worker Service
Service Layer → API Gateway
API Gateway → Load Balancer
Load Balancer → User
Failure Scenario
Component Fails:Database
Impact:New writes fail and cache misses cannot be fulfilled, but cached reads still work
Mitigation:Use database replication for failover and rely on cache for read availability
Architecture Quiz - 3 Questions
Test your understanding
Which component handles protocol translation and authentication?
AAPI Gateway
BLoad Balancer
CService Layer
DMessage Queue
Design Principle
Understanding protocols helps decide where to place components like API gateways for translation, how to optimize data flow with caches, and how to design for reliability and scalability by choosing appropriate communication methods.