Problems that need to be solved in distributed system architecture

How do clients access so many services

API Gateway

• API (Application Programming Interface, application programming interface) is some predefined functions, the application encapsulates its own service capabilities into API, and opens it to users through the API gateway.
• API includes basic information, front-end and back-end request paths and parameters, and request-related protocols.

How the server communicates with the server

Sync communication

HTTP (Hypertext Transfer Protocol)

• Apache Http Client

RPC (Remote Procedure Call Protocol)

• Dubbo>a communication framework for RPC only supports java
• Thriftt
• grpc

Asynchronous communication

A message queue (message queue" is a container that holds messages during their transmission.)

• kafuka
• RadditMQ
• RocketMQ

How to manage so many services

Service Governance

Client-Based Services and Discovery

• Apache Zookeeper

Server-based service and discovery

• Netflix Eureka

What should I do if the server is down?

Retry mechanism

Service down

Service downgrade

Service limit