Requirements compliance

Our non-functional requirements for the proposed WhatsApp design are low latency, consistency, availability, and security. Let’s discuss how we have achieved these requirements in our system:

Low latency: We can minimize the latency of the system at various levels:
- We can do this through geographically distributed WebSocket servers and the cache associated with them.
- We can use Redis cache clusters on top of MySQL database clusters.
- We can use CDNs for frequently sharing documents and media content.
Consistency: The system also provides high consistency in messages with the help of a FIFO messaging queue with strict ordering. However, the ordering of messages would require the ...