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<!DOCTYPE HTML>
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<head>
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<title>Redis 是如何提供服务的 · GitBook</title>
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<link rel="prev" href="redis-shi-jian-qu-dong-xiang-jie/shi-jian-hong-fa.html" />
</head>
<body>
<div class="book">
<div class="book-summary">
<div id="book-search-input" role="search">
<input type="text" placeholder="Type to search" />
</div>
<nav role="navigation">
<ul class="summary">
<li class="header">关于</li>
<li class="chapter " data-level="1.1" data-path="./">
<a href="./">
关于
</a>
</li>
<li class="chapter " data-level="1.2" data-path="yuan-ma-ri-zhi.html">
<a href="yuan-ma-ri-zhi.html">
源码日志
</a>
<ul class="articles">
<li class="chapter " data-level="1.2.1" data-path="yuan-ma-ri-zhi/yuan-ma-ri-zhi.html">
<a href="yuan-ma-ri-zhi/yuan-ma-ri-zhi.html">
源码日志
</a>
</li>
<li class="chapter " data-level="1.2.2" data-path="yuan-ma-ri-zhi/cong-na-li-kai-shi-du-qi-ff0c-zen-yao-du.html">
<a href="yuan-ma-ri-zhi/cong-na-li-kai-shi-du-qi-ff0c-zen-yao-du.html">
从哪里开始读起，怎么读
</a>
</li>
<li class="chapter " data-level="1.2.3" data-path="yuan-ma-ri-zhi/bu-zai-fu-sha-zhu-gao-tai.html">
<a href="yuan-ma-ri-zhi/bu-zai-fu-sha-zhu-gao-tai.html">
不在浮沙筑高台
</a>
</li>
<li class="chapter " data-level="1.2.4" data-path="yuan-ma-ri-zhi/shi-yao-yang-de-yuan-dai-ma-shi-he-yue-du.html">
<a href="yuan-ma-ri-zhi/shi-yao-yang-de-yuan-dai-ma-shi-he-yue-du.html">
什么样的源代码适合阅读
</a>
</li>
</ul>
</li>
<li class="header">Redis 服务框架</li>
<li class="chapter " data-level="2.1" data-path="chu-tan-redis.html">
<a href="chu-tan-redis.html">
初探 Redis
</a>
<ul class="articles">
<li class="chapter " data-level="2.1.1" data-path="chu-tan-redis/redis-zai-huan-cun-xi-tong-suo-chu-de-wei-zhi.html">
<a href="chu-tan-redis/redis-zai-huan-cun-xi-tong-suo-chu-de-wei-zhi.html">
redis 在缓存系统所处的位置
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="2.2" data-path="redis-shi-jian-qu-dong-xiang-jie.html">
<a href="redis-shi-jian-qu-dong-xiang-jie.html">
Redis 事件驱动详解
</a>
<ul class="articles">
<li class="chapter " data-level="2.2.1" data-path="redis-shi-jian-qu-dong-xiang-jie/gai-shu.html">
<a href="redis-shi-jian-qu-dong-xiang-jie/gai-shu.html">
概述
</a>
<ul class="articles">
<li class="chapter " data-level="2.2.1.1" data-path="redis-shi-jian-qu-dong-xiang-jie/shi-jian-qu-dong-shu-ju-jie-gou.html">
<a href="redis-shi-jian-qu-dong-xiang-jie/shi-jian-qu-dong-shu-ju-jie-gou.html">
事件驱动数据结构
</a>
</li>
<li class="chapter " data-level="2.2.1.2" data-path="redis-shi-jian-qu-dong-xiang-jie/shi-jian-xun-huan-zhong-xin.html">
<a href="redis-shi-jian-qu-dong-xiang-jie/shi-jian-xun-huan-zhong-xin.html">
事件循环中心
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="2.2.2" data-path="redis-shi-jian-qu-dong-xiang-jie/zong-jie.html">
<a href="redis-shi-jian-qu-dong-xiang-jie/zong-jie.html">
总结
</a>
</li>
<li class="chapter " data-level="2.2.3" data-path="redis-shi-jian-qu-dong-xiang-jie/redis-shi-jian-qu-dong-yuan-li.html">
<a href="redis-shi-jian-qu-dong-xiang-jie/redis-shi-jian-qu-dong-yuan-li.html">
Redis 事件驱动原理
</a>
<ul class="articles">
<li class="chapter " data-level="2.2.3.1" data-path="redis-shi-jian-qu-dong-xiang-jie/shi-jian-zhu-ce-xiang-jie.html">
<a href="redis-shi-jian-qu-dong-xiang-jie/shi-jian-zhu-ce-xiang-jie.html">
事件注册详解
</a>
</li>
<li class="chapter " data-level="2.2.3.2" data-path="redis-shi-jian-qu-dong-xiang-jie/zhun-bei-jian-ting-gong-zuo.html">
<a href="redis-shi-jian-qu-dong-xiang-jie/zhun-bei-jian-ting-gong-zuo.html">
准备监听工作
</a>
</li>
<li class="chapter " data-level="2.2.3.3" data-path="redis-shi-jian-qu-dong-xiang-jie/wei-jian-ting-tao-jie-zi-zhu-ce-shi-jian.html">
<a href="redis-shi-jian-qu-dong-xiang-jie/wei-jian-ting-tao-jie-zi-zhu-ce-shi-jian.html">
为监听套接字注册事件
</a>
</li>
<li class="chapter " data-level="2.2.3.4" data-path="redis-shi-jian-qu-dong-xiang-jie/shi-jian-xun-huan.html">
<a href="redis-shi-jian-qu-dong-xiang-jie/shi-jian-xun-huan.html">
事件循环
</a>
</li>
<li class="chapter " data-level="2.2.3.5" data-path="redis-shi-jian-qu-dong-xiang-jie/shi-jian-hong-fa.html">
<a href="redis-shi-jian-qu-dong-xiang-jie/shi-jian-hong-fa.html">
事件触发
</a>
</li>
</ul>
</li>
</ul>
</li>
<li class="chapter active" data-level="2.3" data-path="redis-shi-ru-he-ti-gong-fu-wu-de.html">
<a href="redis-shi-ru-he-ti-gong-fu-wu-de.html">
Redis 是如何提供服务的
</a>
<ul class="articles">
<li class="chapter " data-level="2.3.1" data-path="redis-shi-ru-he-ti-gong-fu-wu-de/xiang-xi-de-guo-cheng.html">
<a href="redis-shi-ru-he-ti-gong-fu-wu-de/xiang-xi-de-guo-cheng.html">
详细的过程
</a>
</li>
<li class="chapter " data-level="2.3.2" data-path="redis-shi-ru-he-ti-gong-fu-wu-de/xin-lian-jie-de-chu-li-liu-cheng.html">
<a href="redis-shi-ru-he-ti-gong-fu-wu-de/xin-lian-jie-de-chu-li-liu-cheng.html">
新连接的处理流程
</a>
</li>
</ul>
</li>
<li class="header">Redis 基础数据结构</li>
<li class="chapter " data-level="3.1" data-path="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jie-gou-zong-shu.html">
<a href="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jie-gou-zong-shu.html">
Redis 数据结构综述
</a>
</li>
<li class="chapter " data-level="3.2" data-path="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jie-gou-redisobject.html">
<a href="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jie-gou-redisobject.html">
Redis 数据结构 redisObject
</a>
</li>
<li class="chapter " data-level="3.3" data-path="redis-ji-chu-shu-ju-jie-gou/redisshu-ju-jie-gou-adlist.html">
<a href="redis-ji-chu-shu-ju-jie-gou/redisshu-ju-jie-gou-adlist.html">
Redis数据结构 adlist
</a>
</li>
<li class="chapter " data-level="3.4" data-path="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jie-gou-sds.html">
<a href="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jie-gou-sds.html">
Redis 数据结构 sds
</a>
</li>
<li class="chapter " data-level="3.5" data-path="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jie-gou-dict.html">
<a href="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jie-gou-dict.html">
Redis 数据结构 dict
</a>
</li>
<li class="chapter " data-level="3.6" data-path="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jie-gou-ziplist.html">
<a href="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jie-gou-ziplist.html">
Redis 数据结构 ziplist
</a>
</li>
<li class="chapter " data-level="3.7" data-path="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jie-gou-skiplist.html">
<a href="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jie-gou-skiplist.html">
Redis 数据结构 skiplist
</a>
</li>
<li class="chapter " data-level="3.8" data-path="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jiegou-intset.html">
<a href="redis-ji-chu-shu-ju-jie-gou/redis-shu-ju-jiegou-intset.html">
Redis 数据结构 intset
</a>
</li>
<li class="header">Redis 内功心法</li>
<li class="chapter " data-level="4.1" data-path="redis-nei-gong-xin-fa/redis-shu-ju-tao-tai-ji-zhi.html">
<a href="redis-nei-gong-xin-fa/redis-shu-ju-tao-tai-ji-zhi.html">
Redis 数据淘汰机制
</a>
<ul class="articles">
<li class="chapter " data-level="4.1.1" data-path="redis-nei-gong-xin-fa/redis-shu-ju-tao-tai-ji-zhi/lru-shu-ju-tao-tai-ji-zhi.html">
<a href="redis-nei-gong-xin-fa/redis-shu-ju-tao-tai-ji-zhi/lru-shu-ju-tao-tai-ji-zhi.html">
LRU 数据淘汰机制
</a>
</li>
<li class="chapter " data-level="4.1.2" data-path="redis-nei-gong-xin-fa/redis-shu-ju-tao-tai-ji-zhi/ttl-shu-ju-tao-tai-ji-zhi.html">
<a href="redis-nei-gong-xin-fa/redis-shu-ju-tao-tai-ji-zhi/ttl-shu-ju-tao-tai-ji-zhi.html">
TTL 数据淘汰机制
</a>
</li>
<li class="chapter " data-level="4.1.3" data-path="redis-nei-gong-xin-fa/redis-shu-ju-tao-tai-ji-zhi/zai-na-li-kai-shi-tao-tai-shu-ju.html">
<a href="redis-nei-gong-xin-fa/redis-shu-ju-tao-tai-ji-zhi/zai-na-li-kai-shi-tao-tai-shu-ju.html">
在哪里开始淘汰数据
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="4.2" data-path="redis-nei-gong-xin-fa/rdb-chi-jiu-hua-ce-lve.html">
<a href="redis-nei-gong-xin-fa/rdb-chi-jiu-hua-ce-lve.html">
RDB 持久化策略
</a>
<ul class="articles">
<li class="chapter " data-level="4.2.1" data-path="redis-nei-gong-xin-fa/rdb-chi-jiu-hua-ce-lve/shu-ju-jie-gou-rio.html">
<a href="redis-nei-gong-xin-fa/rdb-chi-jiu-hua-ce-lve/shu-ju-jie-gou-rio.html">
数据结构 rio
</a>
</li>
<li class="chapter " data-level="4.2.2" data-path="redis-nei-gong-xin-fa/rdb-chi-jiu-hua-ce-lve/rdb-chi-jiu-hua-de-yun-zuo-ji-zhi.html">
<a href="redis-nei-gong-xin-fa/rdb-chi-jiu-hua-ce-lve/rdb-chi-jiu-hua-de-yun-zuo-ji-zhi.html">
RDB 持久化的运作机制
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<li class="chapter " data-level="4.2.3" data-path="redis-nei-gong-xin-fa/rdb-chi-jiu-hua-ce-lve/rdb-shu-ju-de-zu-zhi-fang-shi.html">
<a href="redis-nei-gong-xin-fa/rdb-chi-jiu-hua-ce-lve/rdb-shu-ju-de-zu-zhi-fang-shi.html">
RDB 数据的组织方式
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<li class="chapter " data-level="4.3" data-path="redis-nei-gong-xin-fa/aof-chi-jiu-hua-ce-lve.html">
<a href="redis-nei-gong-xin-fa/aof-chi-jiu-hua-ce-lve.html">
AOF 持久化策略
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<li class="chapter " data-level="4.3.1" data-path="redis-nei-gong-xin-fa/aof-chi-jiu-hua-ce-lve/aof-shu-ju-zu-zhi-fang-shi.html">
<a href="redis-nei-gong-xin-fa/aof-chi-jiu-hua-ce-lve/aof-shu-ju-zu-zhi-fang-shi.html">
AOF 数据组织方式
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<li class="chapter " data-level="4.3.2" data-path="redis-nei-gong-xin-fa/aof-chi-jiu-hua-ce-lve/aof-chi-jiu-hua-yun-zuo-ji-zhi.html">
<a href="redis-nei-gong-xin-fa/aof-chi-jiu-hua-ce-lve/aof-chi-jiu-hua-yun-zuo-ji-zhi.html">
AOF 持久化运作机制
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<li class="chapter " data-level="4.3.3" data-path="redis-nei-gong-xin-fa/aof-chi-jiu-hua-ce-lve/xi-shuo-geng-xin-huan-cun.html">
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细说更新缓存
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<li class="chapter " data-level="4.3.4" data-path="redis-nei-gong-xin-fa/aof-chi-jiu-hua-ce-lve/aof-hui-fu-guo-cheng.html">
<a href="redis-nei-gong-xin-fa/aof-chi-jiu-hua-ce-lve/aof-hui-fu-guo-cheng.html">
AOF 恢复过程
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<li class="chapter " data-level="4.3.5" data-path="redis-nei-gong-xin-fa/aof-chi-jiu-hua-ce-lve/aof-de-shi-yong-chang-jing.html">
<a href="redis-nei-gong-xin-fa/aof-chi-jiu-hua-ce-lve/aof-de-shi-yong-chang-jing.html">
AOF 的适用场景
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<li class="chapter " data-level="4.4" data-path="redis-nei-gong-xin-fa/zhu-cong-fu-zhi.html">
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主从复制
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<ul class="articles">
<li class="chapter " data-level="4.4.1" data-path="redis-nei-gong-xin-fa/zhu-cong-fu-zhi/ji-ya-kong-jian.html">
<a href="redis-nei-gong-xin-fa/zhu-cong-fu-zhi/ji-ya-kong-jian.html">
积压空间
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<li class="chapter " data-level="4.4.2" data-path="redis-nei-gong-xin-fa/zhu-cong-fu-zhi/zhu-cong-shu-ju-tong-bu-ji-zhi-gai-shu.html">
<a href="redis-nei-gong-xin-fa/zhu-cong-fu-zhi/zhu-cong-shu-ju-tong-bu-ji-zhi-gai-shu.html">
主从数据同步机制概述
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<li class="chapter " data-level="4.4.3" data-path="redis-nei-gong-xin-fa/zhu-cong-fu-zhi/quan-tong-bu.html">
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全同步
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<li class="chapter " data-level="4.4.4" data-path="redis-nei-gong-xin-fa/zhu-cong-fu-zhi/bu-fen-tong-bu.html">
<a href="redis-nei-gong-xin-fa/zhu-cong-fu-zhi/bu-fen-tong-bu.html">
部分同步
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<li class="chapter " data-level="4.4.5" data-path="redis-nei-gong-xin-fa/zhu-cong-fu-zhi/huan-cun-zhu-ji.html">
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缓存主机
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<li class="chapter " data-level="4.4.6" data-path="redis-nei-gong-xin-fa/zhu-cong-fu-zhi/zong-jie.html">
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总结
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</ul>
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<li class="chapter " data-level="4.5" data-path="redis-nei-gong-xin-fa/redis-shi-wu-ji-zhi.html">
<a href="redis-nei-gong-xin-fa/redis-shi-wu-ji-zhi.html">
Redis 事务机制
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<li class="chapter " data-level="4.5.1" data-path="redis-nei-gong-xin-fa/redis-shi-wu-ji-zhi/redis-ming-ling-dui-lie.html">
<a href="redis-nei-gong-xin-fa/redis-shi-wu-ji-zhi/redis-ming-ling-dui-lie.html">
Redis 命令队列
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<li class="chapter " data-level="4.5.2" data-path="redis-nei-gong-xin-fa/redis-shi-wu-ji-zhi/jian-zhi-de-jian-shi.html">
<a href="redis-nei-gong-xin-fa/redis-shi-wu-ji-zhi/jian-zhi-de-jian-shi.html">
键值的监视
</a>
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<li class="chapter " data-level="4.5.3" data-path="redis-nei-gong-xin-fa/redis-shi-wu-ji-zhi/redis-shi-wu-de-zhi-xing-yu-qu-xiao.html">
<a href="redis-nei-gong-xin-fa/redis-shi-wu-ji-zhi/redis-shi-wu-de-zhi-xing-yu-qu-xiao.html">
Redis 事务的执行与取消
</a>
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<li class="chapter " data-level="4.5.4" data-path="redis-nei-gong-xin-fa/redis-shi-wu-ji-zhi/redis-shi-wu-fan-wai-pian.html">
<a href="redis-nei-gong-xin-fa/redis-shi-wu-ji-zhi/redis-shi-wu-fan-wai-pian.html">
Redis 事务番外篇
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<li class="header">Redis 操练</li>
<li class="header">其他</li>
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<a href="." >Redis 是如何提供服务的</a>
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<h2 id="redis-是如何提供服务的">Redis 是如何提供服务的</h2>
<p>在刚刚接触 redis 的时候，最想要知道的是一个 'set name Jhon' 命令到达 redis 服务器的时候，它是如何返回 'OK' 的？里面命令处理的流程如何，具体细节怎么样？你一定有问过自己。阅读别人的代码是很枯燥的，但带着好奇心阅读代码，是一件很兴奋的事情，接着翻到了 redis 源码的 main() 函数。</p>
<p><img src="assets/hi-redis-2.png" alt=""></p>
<p>redis 在启动做了一些初始化逻辑，比如配置文件读取，数据中心初始化，网络通信模块初始化等，待所有初始化任务完毕后，便开始等待请求。</p>
<p>当请求到来时，redis 进程会被唤醒，原理是 epoll. select, kqueue 等一些 I/O 多路复用的系统调用。如果有阅读上一章节，应该理解这一句话。接着读取来来自客户端的数据，解析命令，查找命令，并执行命令。</p>
<p>执行命令 'set name Jhon' 的时候，redis 会在预先初始化好的哈希表里头，查找 key='name' 对应的位置，并存入。</p>
<p>最后，把回复的内容准备好回送给客户端，客户端于是收到了 'OK'. 接下来，我们看看详细的过程是怎么样的。</p>
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