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LLDsystem_design~12 mins

Game state management in LLD - Architecture Diagram

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System Overview - Game state management

This system manages the current state of a multiplayer game. It keeps track of player actions, game progress, and updates the game world in real-time. The system must handle many players simultaneously, ensure consistency, and provide quick responses.

Architecture Diagram
User
  |
  v
Load Balancer
  |
  v
API Gateway
  |
  v
Game State Service <--> Cache
       |
       v
   Database
Components
User
client
Player interacting with the game
Load Balancer
load_balancer
Distributes incoming player requests evenly to backend services
API Gateway
api_gateway
Handles authentication, routing, and request validation
Game State Service
service
Processes game logic, updates game state, and manages player actions
Cache
cache
Stores frequently accessed game state data for fast reads
Database
database
Persistent storage of game state and player data
Request Flow - 11 Hops
User → Load Balancer
Load Balancer → API Gateway
API Gateway → Game State Service
Game State Service → Cache
Cache → Game State Service
Game State Service → Database
Database → Game State Service
Game State Service → Cache
Game State Service → API Gateway
API Gateway → Load Balancer
Load Balancer → User
Failure Scenario
Component Fails:Database
Impact:Game state updates cannot be persisted; new writes fail but reads may still succeed from cache
Mitigation:Use cache to serve read requests temporarily; implement database replication and failover to restore availability
Architecture Quiz - 3 Questions
Test your understanding
Which component is responsible for distributing player requests evenly to backend services?
AAPI Gateway
BLoad Balancer
CCache
DGame State Service
Design Principle
This architecture uses caching to reduce database load and improve response times. The load balancer and API gateway ensure scalability and security. The system separates concerns by isolating game logic in a dedicated service, enabling real-time updates and consistent game state management.