Redis 作为 NoSQL 数据库的杰出代表，一直广受关注，其轻量级的敏捷架构，向来有存储中的瑞士军刀之称。下面推荐的一篇文章，从源码的角度讲解了Redis 的整个工作流程，是了解 Redis 流程的绝佳文章。强烈推荐：

原文链接：Redis: under the hood

目录：

• Startup
  • Beginning global server state initialization
  • Setting up command table
  • Loading config file
  • initServer()
    • Shared objects
      • Shared integers
    • Event loop
    • Databases
    • TCP socket
    • Server cron
    • Registering connection handler with event loop
    • Opening the AOF
  • Back up to?main()
    • Restoring data
    • Event loop setup
    • Entering the event loop
• Processing a request & returning a response
  • Handling a new connection
  • Reading a command from a client
  • Executing the command and responding
• Summary
• Next time — tracing a?SET and?GET

Redis 启动流程图：

Redis 命令处理流程图：