I'm developing a chat service using RabbitMQ and WebSockets. This is my architecture:
Some observations:
- I think the main drawback of this architecture is each WebSocket client receives a copy of the message delivered by Client A. If client B is not connected to this WebSocket, the message is just ignored.
- Load Balancer B has sticky session enabled, so clients will always reconnect to the same WebSocket service.
- The number of instances of chat API is not always the same as WebSocket services.
- Load Balancer ware implemented using Nginx
- Chat API and WebSocket service both are implemented using Nodejs
- Clients are Android, iOS, or Web apps.
Do you guys have any tips on how to improve this?