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Infosys
System Design
Design a Chat System
System Design
Hard
Real-time Systems
Design a Chat System
60 mins
websockets
message-queue
real-time
60 mins
1 sections
websockets, message-queue
All System Design Topics
Contents (1 sections)
Contents
Requirements
Requirements
Functional Requirements
•
One-on-one messaging
•
Group chats (up to 100 members)
•
Online/offline indicator
•
Push notifications
•
Message history storage
•
Media sharing (images, videos)
Non-Functional Requirements
•
Low latency delivery (< 100ms)
•
Highly available (99.99%)
•
Eventual consistency acceptable for message delivery
•
No message loss — at-least-once delivery
Scale
•
50M daily active users
•
40 messages per user per day = 2B messages/day
•
Average message size = 100 bytes
•
Storage = 200GB/day
Requirements
Functional Requirements
•
One-on-one messaging
•
Group chats (up to 100 members)
•
Online/offline indicator
•
Push notifications
•
Message history storage
•
Media sharing (images, videos)
Non-Functional Requirements
•
Low latency delivery (< 100ms)
•
Highly available (99.99%)
•
Eventual consistency acceptable for message delivery
•
No message loss — at-least-once delivery
Scale
•
50M daily active users
•
40 messages per user per day = 2B messages/day
•
Average message size = 100 bytes
•
Storage = 200GB/day
Design a Chat System [Hard] | Infosys System_design | TomoLink
