Several notes on Redis

最新推荐文章于 2025-04-25 11:59:16 发布

jsc0218

最新推荐文章于 2025-04-25 11:59:16 发布

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分类专栏： Network Programming 文章标签： database redis

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本文深入解析Redis的键值存储结构和事件驱动机制，包括键值存储方式、值的类型（如字符串、列表、集合等）、磁盘序列化过程以及如何通过API select()响应连接管理、周期性检查和数据库保存操作。

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These notes on Redis are based on its beta version. One could see its source code on my GitHub, where I have tidied the original codes in order to make the codes more easily readable with only around 3,000 code lines.

1. Key Data Structure

Redis is a kind of key value store. So its key data structure is hash resident in main memory. Keys and values in Redis' hash would be serialized into disk when save command is executed. Here values could be strings, lists, and even sets (not implemented in the beta version). The following graph is borrowed from 《Redis 设计与实现》 to show Redis' key data structure, that is hash.

2. Event-driven Implementation

When a client connects to Redis, how does Redis know the client's connection? How does Redis implement some periodic checks, such as saving database after certain number of changes or time, and resizing the hash? In essence, Redis runs in a while loop, where API select() is used to respond to the above situations.