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-
-
- socket 的阻塞模式和非阻塞模式
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="2.1.6" data-path="../网络编程/非阻塞模式下send和recv函数的返回值.html">
-
- <a href="../网络编程/非阻塞模式下send和recv函数的返回值.html">
-
-
- 非阻塞模式下 send 和 recv 函数的返回值
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="2.1.7" data-path="../网络编程/服务器开发通信协议设计介绍.html">
-
- <a href="../网络编程/服务器开发通信协议设计介绍.html">
-
-
- 服务器开发通信协议设计介绍
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="2.1.8" data-path="../网络编程/TCP协议如何解决粘包、半包问题.html">
-
- <a href="../网络编程/TCP协议如何解决粘包、半包问题.html">
-
-
- TCP 协议如何解决粘包、半包问题
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="2.1.9" data-path="../网络编程/网络通信中收发数据的正确姿势.html">
-
- <a href="../网络编程/网络通信中收发数据的正确姿势.html">
-
-
- 网络通信中收发数据的正确姿势
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="2.1.10" data-path="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
-
- <a href="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
-
-
- 服务器端发数据时，如果对端一直不收，怎么办？
-
- </a>
-
-
- </li>
-
- </ul>
-
- </li>
-
-
-
- <li class="divider"></li>
-
-
-
- <li class="chapter " data-level="3.1" data-path="../程序员必知必会的网络命令/">
-
- <a href="../程序员必知必会的网络命令/">
-
-
- 程序员必知必会的网络命令
-
- </a>
-
-
- <ul class="articles">
-
-
- <li class="chapter " data-level="3.1.1" data-path="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
-
- <a href="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
-
-
- 利用telnet命令发电子邮件
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="3.1.2" data-path="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
-
- <a href="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
-
-
- 做Java或者C++开发都应该知道的lsof命令
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="3.1.3" data-path="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
-
- <a href="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
-
-
- Linux网络故障排查的瑞士军刀nc命令
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="3.1.4" data-path="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
-
- <a href="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
-
-
- Linux tcpdump使用详解
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="3.1.5" data-path="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
-
- <a href="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
-
-
- 从抓包的角度分析connect函数的连接过程
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="3.1.6" data-path="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
-
- <a href="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
-
-
- 服务器开发中网络数据分析与故障排查经验漫谈
-
- </a>
-
-
- </li>
-
- </ul>
-
- </li>
-
-
-
- <li class="header">Part II</li>
-
-
-
- <li class="chapter " data-level="4.1" data-path="../高性能服务器框架设计/">
-
- <a href="../高性能服务器框架设计/">
-
-
- 高性能服务器框架设计
-
- </a>
-
-
- <ul class="articles">
-
-
- <li class="chapter " data-level="4.1.1" data-path="../高性能服务器框架设计/主线程与工作线程的分工.html">
-
- <a href="../高性能服务器框架设计/主线程与工作线程的分工.html">
-
-
- 主线程与工作线程的分工
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.2" data-path="../高性能服务器框架设计/Reactor模式.html">
-
- <a href="../高性能服务器框架设计/Reactor模式.html">
-
-
- Reactor模式
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.3" data-path="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
-
- <a href="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
-
-
- 实例：一个服务器程序的架构介绍
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.4" data-path="../高性能服务器框架设计/错误码系统的设计.html">
-
- <a href="../高性能服务器框架设计/错误码系统的设计.html">
-
-
- 错误码系统的设计
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.5" data-path="../高性能服务器框架设计/日志系统的设计.html">
-
- <a href="../高性能服务器框架设计/日志系统的设计.html">
-
-
- 日志系统的设计
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.6" data-path="../高性能服务器框架设计/如何设计断线自动重连机制.html">
-
- <a href="../高性能服务器框架设计/如何设计断线自动重连机制.html">
-
-
- 如何设计断线自动重连机制
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.7" data-path="../高性能服务器框架设计/心跳包机制设计详解.html">
-
- <a href="../高性能服务器框架设计/心跳包机制设计详解.html">
-
-
- 心跳包机制设计详解
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.8" data-path="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
-
- <a href="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
-
-
- 业务数据处理一定要单独开线程吗
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="4.1.9" data-path="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
-
- <a href="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
-
-
- C++ 高性能服务器网络框架设计细节
-
- </a>
-
-
- </li>
-
- </ul>
-
- </li>
-
-
-
- <li class="divider"></li>
-
-
-
- <li class="chapter " data-level="5.1" data-path="../服务器开发案例实战/">
-
- <a href="../服务器开发案例实战/">
-
-
- 服务器开发案例实战
-
- </a>
-
-
- <ul class="articles">
-
-
- <li class="chapter " data-level="5.1.1" data-path="../服务器开发案例实战/从零实现一个http服务器.html">
-
- <a href="../服务器开发案例实战/从零实现一个http服务器.html">
-
-
- 从零实现一个http服务器
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.2" data-path="../服务器开发案例实战/从零实现一款12306刷票软件.html">
-
- <a href="../服务器开发案例实战/从零实现一款12306刷票软件.html">
-
-
- 从零实现一款12306刷票软件
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.3" data-path="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
-
- <a href="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
-
-
- 从零实现一个邮件收发客户端
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.4" data-path="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
-
- <a href="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
-
-
- 从零开发一个WebSocket服务器
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.5" data-path="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
-
- <a href="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
-
-
- 从零学习开源项目系列（一） 从一款多人联机实时对战游戏开始
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.6" data-path="../服务器开发案例实战/2最后一战概况.html">
-
- <a href="../服务器开发案例实战/2最后一战概况.html">
-
-
- 从零学习开源项目系列（二） 最后一战概况
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.7" data-path="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
-
- <a href="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
-
-
- 从零学习开源项目系列（三） CSBattleMgr服务源码研究
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="5.1.8" data-path="../服务器开发案例实战/4LogServer源码探究.html">
-
- <a href="../服务器开发案例实战/4LogServer源码探究.html">
-
-
- 从零学习开源项目系列（四）LogServer源码探究
-
- </a>
-
-
- </li>
-
- </ul>
-
- </li>
-
-
-
- <li class="header">Part III</li>
-
-
-
- <li class="chapter " data-level="6.1" data-path="../TeamTalk源码解析/">
-
- <a href="../TeamTalk源码解析/">
-
-
- TeamTalk IM源码分析
-
- </a>
-
-
- <ul class="articles">
-
-
- <li class="chapter " data-level="6.1.1" data-path="../TeamTalk源码解析/01TeamTalk介绍.html">
-
- <a href="../TeamTalk源码解析/01TeamTalk介绍.html">
-
-
- 01 TeamTalk介绍
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.2" data-path="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
-
- <a href="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
-
-
- 02 服务器端的程序的编译与部署
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.3" data-path="../TeamTalk源码解析/03服务器端的程序架构介绍.html">
-
- <a href="../TeamTalk源码解析/03服务器端的程序架构介绍.html">
-
-
- 03 服务器端的程序架构介绍
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.4" data-path="../TeamTalk源码解析/04服务器端db_proxy_server源码分析.html">
-
- <a href="../TeamTalk源码解析/04服务器端db_proxy_server源码分析.html">
-
-
- 04 服务器端db_proxy_server源码分析
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.5" data-path="../TeamTalk源码解析/05服务器端msg_server源码分析.html">
-
- <a href="../TeamTalk源码解析/05服务器端msg_server源码分析.html">
-
-
- 05 服务器端msg_server源码分析
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.6" data-path="../TeamTalk源码解析/06服务器端login_server源码分析.html">
-
- <a href="../TeamTalk源码解析/06服务器端login_server源码分析.html">
-
-
- 06 服务器端login_server源码分析
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.7" data-path="../TeamTalk源码解析/07服务器端msfs源码分析.html">
-
- <a href="../TeamTalk源码解析/07服务器端msfs源码分析.html">
-
-
- 07 服务器端msfs源码分析
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.8" data-path="../TeamTalk源码解析/08服务器端file_server源码分析.html">
-
- <a href="../TeamTalk源码解析/08服务器端file_server源码分析.html">
-
-
- 08 服务器端file_server源码分析
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.9" data-path="../TeamTalk源码解析/09服务器端route_server源码分析.html">
-
- <a href="../TeamTalk源码解析/09服务器端route_server源码分析.html">
-
-
- 09 服务器端route_server源码分析
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.10" data-path="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
-
- <a href="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
-
-
- 10 开放一个TeamTalk测试服务器地址和几个测试账号
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="6.1.11" data-path="../TeamTalk源码解析/11pc客户端源码分析.html">
-
- <a href="../TeamTalk源码解析/11pc客户端源码分析.html">
-
-
- 11 pc客户端源码分析
-
- </a>
-
-
- </li>
-
- </ul>
-
- </li>
-
-
-
- <li class="divider"></li>
-
-
-
- <li class="chapter " data-level="7.1" data-path="../libevent源码深度剖析/">
-
- <a href="../libevent源码深度剖析/">
-
-
- libevent源码深度剖析
-
- </a>
-
-
- <ul class="articles">
-
-
- <li class="chapter " data-level="7.1.1" data-path="../libevent源码深度剖析/libevent源码深度剖析01.html">
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- <a href="../libevent源码深度剖析/libevent源码深度剖析01.html">
-
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- libevent源码深度剖析01
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.2" data-path="../libevent源码深度剖析/libevent源码深度剖析02.html">
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- <a href="../libevent源码深度剖析/libevent源码深度剖析02.html">
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- libevent源码深度剖析02
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="7.1.3" data-path="../libevent源码深度剖析/libevent源码深度剖析03.html">
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- <a href="../libevent源码深度剖析/libevent源码深度剖析03.html">
-
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- libevent源码深度剖析03
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="7.1.4" data-path="../libevent源码深度剖析/libevent源码深度剖析04.html">
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- <a href="../libevent源码深度剖析/libevent源码深度剖析04.html">
-
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- libevent源码深度剖析04
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.5" data-path="../libevent源码深度剖析/libevent源码深度剖析05.html">
-
- <a href="../libevent源码深度剖析/libevent源码深度剖析05.html">
-
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- libevent源码深度剖析05
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="7.1.6" data-path="../libevent源码深度剖析/libevent源码深度剖析06.html">
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- <a href="../libevent源码深度剖析/libevent源码深度剖析06.html">
-
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- libevent源码深度剖析06
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.7" data-path="../libevent源码深度剖析/libevent源码深度剖析07.html">
-
- <a href="../libevent源码深度剖析/libevent源码深度剖析07.html">
-
-
- libevent源码深度剖析07
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.8" data-path="../libevent源码深度剖析/libevent源码深度剖析08.html">
-
- <a href="../libevent源码深度剖析/libevent源码深度剖析08.html">
-
-
- libevent源码深度剖析08
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.9" data-path="../libevent源码深度剖析/libevent源码深度剖析09.html">
-
- <a href="../libevent源码深度剖析/libevent源码深度剖析09.html">
-
-
- libevent源码深度剖析09
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.10" data-path="../libevent源码深度剖析/libevent源码深度剖析10.html">
-
- <a href="../libevent源码深度剖析/libevent源码深度剖析10.html">
-
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- libevent源码深度剖析10
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.11" data-path="../libevent源码深度剖析/libevent源码深度剖析11.html">
-
- <a href="../libevent源码深度剖析/libevent源码深度剖析11.html">
-
-
- libevent源码深度剖析11
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="7.1.12" data-path="../libevent源码深度剖析/libevent源码深度剖析12.html">
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- libevent源码深度剖析12
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- </a>
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- </a>
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- </ul>
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- <a href="./">
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- leveldb源码分析
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- <ul class="articles">
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- leveldb源码分析1
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- leveldb源码分析2
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- </a>
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- <li class="chapter " data-level="7.2.3" data-path="leveldb源码分析3.html">
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- leveldb源码分析3
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- </a>
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- <li class="chapter active" data-level="7.2.4" data-path="leveldb源码分析4.html">
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- leveldb源码分析4
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- </a>
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- <li class="chapter " data-level="7.2.5" data-path="leveldb源码分析5.html">
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- leveldb源码分析5
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- </a>
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- <li class="chapter " data-level="7.2.6" data-path="leveldb源码分析6.html">
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- leveldb源码分析6
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- <li class="chapter " data-level="7.2.7" data-path="leveldb源码分析7.html">
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- leveldb源码分析7
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- <li class="chapter " data-level="7.2.8" data-path="leveldb源码分析8.html">
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- leveldb源码分析8
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- leveldb源码分析9
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- <li class="chapter " data-level="7.2.10" data-path="leveldb源码分析10.html">
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- leveldb源码分析10
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- leveldb源码分析11
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- </a>
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- <li class="chapter " data-level="7.2.12" data-path="leveldb源码分析12.html">
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- leveldb源码分析12
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- </a>
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- <li class="chapter " data-level="7.2.13" data-path="leveldb源码分析13.html">
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- leveldb源码分析13
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- <li class="chapter " data-level="7.2.14" data-path="leveldb源码分析14.html">
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- leveldb源码分析14
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- </a>
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- </li>
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- <li class="chapter " data-level="7.2.15" data-path="leveldb源码分析15.html">
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- leveldb源码分析15
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- </a>
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- </li>
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- <li class="chapter " data-level="7.2.16" data-path="leveldb源码分析16.html">
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- leveldb源码分析16
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- </a>
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-
- </li>
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- <li class="chapter " data-level="7.2.17" data-path="leveldb源码分析17.html">
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- <a href="leveldb源码分析17.html">
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- leveldb源码分析17
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- </a>
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- </li>
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- <li class="chapter " data-level="7.2.18" data-path="leveldb源码分析18.html">
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- <a href="leveldb源码分析18.html">
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- leveldb源码分析18
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="7.2.19" data-path="leveldb源码分析19.html">
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- <a href="leveldb源码分析19.html">
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- leveldb源码分析19
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="7.2.20" data-path="leveldb源码分析20.html">
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- <a href="leveldb源码分析20.html">
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-
- leveldb源码分析20
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="7.2.21" data-path="leveldb源码分析21.html">
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- <a href="leveldb源码分析21.html">
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-
- leveldb源码分析21
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="7.2.22" data-path="leveldb源码分析22.html">
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- <a href="leveldb源码分析22.html">
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-
- leveldb源码分析22
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- </a>
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-
- </li>
-
- </ul>
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- </li>
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-
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- <li class="divider"></li>
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- <li class="chapter " data-level="8.1" data-path="../Memcached源码分析/">
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- <a href="../Memcached源码分析/">
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-
- Memcached源码分析
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- </a>
-
-
- <ul class="articles">
-
-
- <li class="chapter " data-level="8.1.1" data-path="../Memcached源码分析/00服务器资源调整.html">
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- <a href="../Memcached源码分析/00服务器资源调整.html">
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- 00 服务器资源调整
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="8.1.2" data-path="../Memcached源码分析/01初始化参数解析.html">
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- <a href="../Memcached源码分析/01初始化参数解析.html">
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-
- 01 初始化参数解析
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- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.3" data-path="../Memcached源码分析/02网络监听的建立.html">
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- <a href="../Memcached源码分析/02网络监听的建立.html">
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-
- 02 网络监听的建立
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="8.1.4" data-path="../Memcached源码分析/03网络连接建立.html">
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- <a href="../Memcached源码分析/03网络连接建立.html">
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-
- 03 网络连接建立
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="8.1.5" data-path="../Memcached源码分析/04内存初始化.html">
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- <a href="../Memcached源码分析/04内存初始化.html">
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-
- 04 内存初始化
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- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.6" data-path="../Memcached源码分析/05资源初始化.html">
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- <a href="../Memcached源码分析/05资源初始化.html">
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-
- 05 资源初始化
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.7" data-path="../Memcached源码分析/06get过程.html">
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- <a href="../Memcached源码分析/06get过程.html">
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-
- 06 get过程
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- </a>
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-
- </li>
-
- <li class="chapter " data-level="8.1.8" data-path="../Memcached源码分析/07cas属性.html">
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- <a href="../Memcached源码分析/07cas属性.html">
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-
- 07 cas属性
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.9" data-path="../Memcached源码分析/08内存池.html">
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- <a href="../Memcached源码分析/08内存池.html">
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-
- 08 内存池
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.10" data-path="../Memcached源码分析/09连接队列.html">
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- <a href="../Memcached源码分析/09连接队列.html">
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-
- 09 连接队列
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.11" data-path="../Memcached源码分析/10Hash表操作.html">
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- <a href="../Memcached源码分析/10Hash表操作.html">
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-
- 10 Hash表操作
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.12" data-path="../Memcached源码分析/12set操作.html">
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- <a href="../Memcached源码分析/12set操作.html">
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-
- 12 set操作
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.13" data-path="../Memcached源码分析/13do_item_alloc操作.html">
-
- <a href="../Memcached源码分析/13do_item_alloc操作.html">
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-
- 13 do_item_alloc操作
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.14" data-path="../Memcached源码分析/14item结构.html">
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- <a href="../Memcached源码分析/14item结构.html">
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-
- 14 item结构
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="8.1.15" data-path="../Memcached源码分析/15Hash表扩容.html">
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- <a href="../Memcached源码分析/15Hash表扩容.html">
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-
- 15 Hash表扩容
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="8.1.16" data-path="../Memcached源码分析/16线程交互.html">
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- <a href="../Memcached源码分析/16线程交互.html">
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-
- 16 线程交互
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="8.1.17" data-path="../Memcached源码分析/17状态机.html">
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- <a href="../Memcached源码分析/17状态机.html">
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-
- 17 状态机
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- </a>
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-
- </li>
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- </ul>
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- </li>
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- <li class="divider"></li>
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- 游戏开发专题
-
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-
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- <ul class="articles">
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- <li class="chapter " data-level="9.1.1" data-path="../游戏开发专题/1游戏服务器开发的基本体系与服务器端开发的一些建议.html">
-
- <a href="../游戏开发专题/1游戏服务器开发的基本体系与服务器端开发的一些建议.html">
-
-
- 1 游戏服务器开发的基本体系与服务器端开发的一些建议
-
- </a>
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-
- </li>
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- <li class="chapter " data-level="9.1.2" data-path="../游戏开发专题/2网络游戏服务器开发框架设计介绍.html">
-
- <a href="../游戏开发专题/2网络游戏服务器开发框架设计介绍.html">
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-
- 2 网络游戏服务器开发框架设计介绍
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="9.1.3" data-path="../游戏开发专题/3游戏后端开发需要掌握的知识.html">
-
- <a href="../游戏开发专题/3游戏后端开发需要掌握的知识.html">
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-
- 3 游戏后端开发需要掌握的知识
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="9.1.4" data-path="../游戏开发专题/4关于游戏服务端架构的整理.html">
-
- <a href="../游戏开发专题/4关于游戏服务端架构的整理.html">
-
-
- 4 关于游戏服务端架构的整理
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="9.1.5" data-path="../游戏开发专题/5各类游戏对应的服务端架构.html">
-
- <a href="../游戏开发专题/5各类游戏对应的服务端架构.html">
-
-
- 5 各类游戏对应的服务端架构
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="9.1.6" data-path="../游戏开发专题/6从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则.html">
-
- <a href="../游戏开发专题/6从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则.html">
-
-
- 6 从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="9.1.7" data-path="../游戏开发专题/7QQ游戏百万人同时在线服务器架构实现.html">
-
- <a href="../游戏开发专题/7QQ游戏百万人同时在线服务器架构实现.html">
-
-
- 7 QQ游戏百万人同时在线服务器架构实现
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="9.1.8" data-path="../游戏开发专题/8大型多人在线游戏服务器架构设计.html">
-
- <a href="../游戏开发专题/8大型多人在线游戏服务器架构设计.html">
-
-
- 8 大型多人在线游戏服务器架构设计
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="9.1.9" data-path="../游戏开发专题/9百万用户级游戏服务器架构设计.html">
-
- <a href="../游戏开发专题/9百万用户级游戏服务器架构设计.html">
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-
- 9 百万用户级游戏服务器架构设计
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="9.1.10" data-path="../游戏开发专题/10十万在线的WebGame的数据库设计思路.html">
-
- <a href="../游戏开发专题/10十万在线的WebGame的数据库设计思路.html">
-
-
- 10 十万在线的WebGame的数据库设计思路
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="9.1.11" data-path="../游戏开发专题/11一种高性能网络游戏服务器架构设计.html">
-
- <a href="../游戏开发专题/11一种高性能网络游戏服务器架构设计.html">
-
-
- 11 一种高性能网络游戏服务器架构设计
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="9.1.12" data-path="../游戏开发专题/12经典游戏服务器端架构概述.html">
-
- <a href="../游戏开发专题/12经典游戏服务器端架构概述.html">
-
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- 12 经典游戏服务器端架构概述
-
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-
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-
- <li class="chapter " data-level="9.1.13" data-path="../游戏开发专题/13游戏跨服架构进化之路.html">
-
- <a href="../游戏开发专题/13游戏跨服架构进化之路.html">
-
-
- 13 游戏跨服架构进化之路
-
- </a>
-
-
- </li>
-
- </ul>
-
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-
-
-
- <li class="header">Part IV</li>
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-
- <li class="chapter " data-level="10.1" data-path="../程序员面试题精讲/">
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- 程序员面试题精讲
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- <li class="chapter " data-level="10.1.1" data-path="../程序员面试题精讲/腾讯后台开发实习生技能要求.html">
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- <a href="../程序员面试题精讲/腾讯后台开发实习生技能要求.html">
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- 腾讯后台开发实习生技能要求
-
- </a>
-
-
- </li>
-
- <li class="chapter " data-level="10.1.2" data-path="../程序员面试题精讲/聊聊如何拿大厂的offer.html">
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- <a href="../程序员面试题精讲/聊聊如何拿大厂的offer.html">
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- 聊聊如何拿大厂的 offer
-
- </a>
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-
- </li>
-
- <li class="chapter " data-level="10.1.3" data-path="../程序员面试题精讲/网络通信题目集锦.html">
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- <a href="../程序员面试题精讲/网络通信题目集锦.html">
-
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- 网络通信题目集锦
-
- </a>
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-
- <li class="chapter " data-level="10.1.4" data-path="../程序员面试题精讲/我面试后端开发经理的经历.html">
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- <a href="../程序员面试题精讲/我面试后端开发经理的经历.html">
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- 我面试后端开发经理的经历
-
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-
- </li>
-
- <li class="chapter " data-level="10.1.5" data-path="../程序员面试题精讲/LinuxCC++后端开发面试问哪些问题.html">
-
- <a href="../程序员面试题精讲/LinuxCC++后端开发面试问哪些问题.html">
-
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- Linux C/C++后端开发面试问哪些问题
-
- </a>
-
-
- </li>
-
- </ul>
-
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-
- <li class="chapter " data-level="10.2" data-path="../职业规划/">
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- <a href="../职业规划/">
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- 职业规划
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- <ul class="articles">
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- <li class="chapter " data-level="10.2.1" data-path="../职业规划/给工作4年迷茫的程序员们的一点建议.html">
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- <a href="../职业规划/给工作4年迷茫的程序员们的一点建议.html">
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- 给工作 4 年迷茫的程序员们的一点建议
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- <div id="anchor-navigation-ex-navbar"><i class="fa fa-navicon"></i><ul><li><span class="title-icon "></span><a href="#leveldb源码分析4"><b></b>leveldb源码分析4</a></li><ul><li><span class="title-icon "></span><a href="#4memtable之2"><b></b>4.Memtable之2</a></li><ul><li><span class="title-icon "></span><a href="#46-comparator"><b></b>4.6 Comparator</a></li><li><span class="title-icon "></span><a href="#47-memtableinsert"><b></b>4.7 Memtable::Insert()</a></li><li><span class="title-icon "></span><a href="#48-memtableget"><b></b>4.8 Memtable::Get()</a></li><li><span class="title-icon "></span><a href="#49-小结"><b></b>4.9 小结</a></li></ul></ul></ul></div><h1 id="leveldb源码分析4"><a name="leveldb源码分析4" class="anchor-navigation-ex-anchor" href="#leveldb源码分析4"><i class="fa fa-link" aria-hidden="true"></i></a>leveldb源码分析4</h1>
- <p>本系列《leveldb源码分析》共有22篇文章，这是第四篇</p>
- <h2 id="4memtable之2"><a name="4memtable之2" class="anchor-navigation-ex-anchor" href="#4memtable之2"><i class="fa fa-link" aria-hidden="true"></i></a>4.Memtable之2</h2>
- <h3 id="46-comparator"><a name="46-comparator" class="anchor-navigation-ex-anchor" href="#46-comparator"><i class="fa fa-link" aria-hidden="true"></i></a>4.6 Comparator</h3>
- <p>弄清楚了key，接下来就要看看key的使用了，先从<strong>Comparator</strong>开始分析。首先Comparator是一个抽象类，导出了几个接口。</p>
- <p>其中<strong>Name()</strong>和<strong>Compare()</strong>接口都很明了，另外的两个Find xxx接口都有什么功能呢，直接看程序注释：</p>
- <pre class="language-"><code>//Advanced functions: these are used to reduce the space requirements
- //for internal data structures like index blocks.
- // 这两个函数：用于减少像index blocks这样的内部数据结构占用的空间
- // 其中的*start和*key参数都是IN OUT的。
- //If *start < limit, changes *start to a short string in [start,limit).
- //Simple comparator implementations may return with *start unchanged,
- //i.e., an implementation of this method that does nothing is correct.
- // 这个函数的作用就是：如果*start < limit，就在[startlimit,)中找到一个
- // 短字符串，并赋给*start返回
- // 简单的comparator实现可能不改变*start，这也是正确的
- virtual void FindShortestSeparator(std::string* start,
- const Slice& limit) const = 0;
- //Changes *key to a short string >= *key.
- //Simple comparator implementations may return with *key unchanged,
- //i.e., an implementation of this method that does nothing is correct.
- //这个函数的作用就是：找一个>= *key的短字符串
- //简单的comparator实现可能不改变*key，这也是正确的
- virtual void FindShortSuccessor(std::string* key) const = 0;
- </code></pre><p>其中的<strong>实现类有两个</strong>，一个是<strong>内置的BytewiseComparatorImpl</strong>，另一个是<strong>InternalKeyComparator</strong>。下面分别来分析。</p>
- <h4 id="461-bytewisecomparatorimpl"><a name="461-bytewisecomparatorimpl" class="anchor-navigation-ex-anchor" href="#461-bytewisecomparatorimpl"><i class="fa fa-link" aria-hidden="true"></i></a>4.6.1 BytewiseComparatorImpl</h4>
- <p>首先是重载的Name和比较函数，比较函数如其名，就是字符串比较，如下：</p>
- <pre class="language-"><code>virtual const char* Name() const {return"leveldb.BytewiseComparator";}
- virtual int Compare(const Slice& a, const Slice& b) const {return a.compare(b);}
- </code></pre><p>再来看看Byte wise的comparator是如何实现<strong>FindShortestSeparator()</strong>的，没什么特别的，代码 + 注释如下：</p>
- <pre class="language-"><code>virtual void FindShortestSeparator(std::string* start,
- onst Slice& limit) const
- {
- // 首先计算共同前缀字符串的长度
- size_t min_length = std::min(start->size(), limit.size());
- size_t diff_index = 0;
- while ((diff_index < min_length) &&
- ((*start)[diff_index] == limit[diff_index]))
- {
- diff_index++;
- }
- if (diff_index >= min_length)
- {
- // 说明*start是limit的前缀，或者反之，此时不作修改，直接返回
- }
- else
- {
- // 尝试执行字符start[diff_index]++，
- 设置start长度为diff_index+1，并返回
- // ++条件：字符< oxff 并且字符+1 < limit上该index的字符
- uint8_t diff_byte = static_cast<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>uint8_t</span><span class="token punctuation">></span></span>((*start)[diff_index]);
- if (diff_byte < static_cast<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>uint8_t</span><span class="token punctuation">></span></span>(0xff) &&
- diff_byte + 1 < static_cast<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>uint8_t</span><span class="token punctuation">></span></span>(limit[diff_index]))
- {
- (*start)[diff_index]++;
- start->resize(diff_index + 1);
- assert(Compare(*start, limit) < 0);
- }
- }
- }
- </code></pre><p>最后是FindShortSuccessor()，这个更简单了，代码+注释如下：</p>
- <pre class="language-"><code>virtual void FindShortSuccessor(std::string* key) const
- {
- // 找到第一个可以++的字符，执行++后，截断字符串；
- // 如果找不到说明*key的字符都是0xff啊，那就不作修改，直接返回
- size_t n = key->size();
- for (size_t i = 0; i < n; i++)
- {
- const uint8_t byte = (*key)[i];
- if (byte != static_cast<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>uint8_t</span><span class="token punctuation">></span></span>(0xff))
- {
- (*key)[i] = byte + 1;
- key->resize(i+1);
- return;
- }
- }
- }
- </code></pre><p>Leveldb内建的基于<strong>Byte wise</strong>的comparator类就这么多内容了，下面再来看看InternalKeyComparator。</p>
- <h4 id="462-internalkeycomparator"><a name="462-internalkeycomparator" class="anchor-navigation-ex-anchor" href="#462-internalkeycomparator"><i class="fa fa-link" aria-hidden="true"></i></a>4.6.2 InternalKeyComparator</h4>
- <p>从上面对Internal Key的讨论可知，由于它是由<strong>user key和sequence number和value type组合而成</strong>的，因此它还需要user key的比较，所以InternalKeyComparator有一个Comparator<em> user<em>comparator</em>成员，用于<em>*user key</em></em>的比较。</p>
- <p>在leveldb中的名字为："leveldb.InternalKeyComparator"，下面来看看比较函数：</p>
- <pre class="language-"><code>Compare(const Slice& akey, const Slice& bkey)
- </code></pre><p>代码很简单，其比较逻辑是：</p>
- <ul>
- <li>S1 首先比较user key，基于用户设置的comparator，如果<strong>user key不相等</strong>就直接<strong>返回比较</strong>,<strong>否则</strong>执行进入S2</li>
- <li>S2 取出8字节的sequence number | value type，如果akey的 <strong>> bkey</strong>的则返回<strong>-1</strong>，如果akey的<strong><bkey</strong>的返回<strong>1</strong>，<strong>相等</strong>返回<strong>0</strong></li>
- </ul>
- <p>由此可见其排序比较依据依次是：</p>
- <ol>
- <li>首先根据user key按升序排列</li>
- <li>然后根据sequence number按降序排列</li>
- <li>最后根据value type按降序排列</li>
- </ol>
- <p>虽然比较时value type并不重要，因为sequence number是唯一的，但是直接取出8byte的sequence number | value type，然后做比较<strong>更方便</strong>，不需要再次移位提取出7byte的sequence number，又何乐而不为呢。这也是把value type安排在低7byte的好处吧，排序的两个依据就是<strong>user key和sequence number</strong>。</p>
- <p>接下来就该看看其<strong>FindShortestSeparator()函数</strong>实现了，该函数取出Internal Key中的user key字段，根据user指定的comparator找到并替换start，如果start被替换了，就用<strong>新的start更新Internal Key</strong>，并使用最大的<strong>sequence number</strong>。否则保持不变。</p>
- <p>函数声明：</p>
- <pre class="language-"><code>void InternalKeyComparator::FindShortestSeparator(std::string* start, const Slice& limit) const;
- </code></pre><p>函数实现：</p>
- <pre class="language-"><code>// 尝试更新user key，基于指定的user comparator
- Slice user_start = ExtractUserKey(*start);
- Slice user_limit = ExtractUserKey(limit);
- std::string tmp(user_start.data(), user_start.size());
- user_comparator_->FindShortestSeparator(&tmp, user_limit);
- if(tmp.size()<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>user_start.size()&&</span>
- <span class="token attr-name">user_comparator_-</span><span class="token punctuation">></span></span>Compare(user_start, tmp)<0)
- {
- // user key在物理上长度变短了，但其逻辑值变大了.生产新的*start时，
- // 使用最大的sequence number，以保证排在相同user key记录序列的第一个
- PutFixed64(&tmp, PackSequenceAndType(kMaxSequenceNumber,
- kValueTypeForSeek));
- assert(this->Compare(*start, tmp) < 0);
- assert(this->Compare(tmp, limit) < 0);
- start->swap(tmp);
- }
- </code></pre><p>接下来是<strong>FindShortSuccessor(std::string* key)</strong>函数，该函数取出Internal Key中的<strong>user key</strong>字段，根据user指定的<strong>comparator</strong>找到并替换key，如果key被替换了，就用新的key更新<strong>Internal Key</strong>，并使用最大的<strong>sequence number</strong>。否则保持不变。实现逻辑如下：</p>
- <pre class="language-"><code>Slice user_key = ExtractUserKey(*key);
- // 尝试更新user key，基于指定的user comparator
- std::string tmp(user_key.data(), user_key.size());
- user_comparator_->FindShortSuccessor(&tmp);
- if(tmp.size()<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>user_key.size()</span> <span class="token attr-name">&&</span>
- <span class="token attr-name">user_comparator_-</span><span class="token punctuation">></span></span>Compare(user_key, tmp)<0)
- {
- // user key在物理上长度变短了，但其逻辑值变大了.生产新的*start时，
- // 使用最大的sequence number，以保证排在相同user key记录序列的第一个
- PutFixed64(&tmp, PackSequenceAndType(kMaxSequenceNumber,
- kValueTypeForSeek));
- assert(this->Compare(*key, tmp) < 0);
- key->swap(tmp);
- }
- </code></pre><h3 id="47-memtableinsert"><a name="47-memtableinsert" class="anchor-navigation-ex-anchor" href="#47-memtableinsert"><i class="fa fa-link" aria-hidden="true"></i></a>4.7 Memtable::Insert()</h3>
- <p>把相关的<strong>Key和Key Comparator</strong>都弄清楚后，是时候分析memtable本身了。首先是向memtable<strong>插入记录的接</strong>口，函数原型如下：</p>
- <pre class="language-"><code>void Add(SequenceNumber seq, ValueType type, const Slice& key, const Slice& value);
- </code></pre><p>代码实现如下：</p>
- <pre class="language-"><code>// KV entry字符串有下面4部分连接而成
- //key_size : varint32 of internal_key.size()
- //key bytes : char[internal_key.size()]
- //value_size : varint32 of value.size()
- // value bytes : char[value.size()]
- size_t key_size = key.size();
- size_t val_size = value.size();
- size_t internal_key_size = key_size + 8;
- const size_t encoded_len = VarintLength(internal_key_size) +
- internal_key_size +
- VarintLength(val_size) + val_size;
- char* buf = arena_.Allocate(encoded_len);
- char* p = EncodeVarint32(buf, internal_key_size);
- memcpy(p, key.data(), key_size);
- p += key_size;
- EncodeFixed64(p, (s << 8) | type);
- p += 8;
- p = EncodeVarint32(p, val_size);
- memcpy(p, value.data(), val_size);
- assert((p + val_size) - buf == encoded_len);
- able_.Insert(buf);
- </code></pre><p>根据代码，我们可以分析出KV记录在skip list的<strong>存储格式</strong>等信息，首先总长度为：</p>
- <pre class="language-"><code>VarInt(Internal Key size) len + internal key size + VarInt(value) len + value size
- </code></pre><p>它们的相互衔接也就是KV的存储格式：</p>
- <pre class="language-"><code>| VarInt(Internal Key size) len | internal key |VarInt(value) len |value|
- </code></pre><p>其中前面说过：</p>
- <pre class="language-"><code>internal key = |user key |sequence number |type |
- Internal key size = key size + 8
- </code></pre><h3 id="48-memtableget"><a name="48-memtableget" class="anchor-navigation-ex-anchor" href="#48-memtableget"><i class="fa fa-link" aria-hidden="true"></i></a>4.8 Memtable::Get()</h3>
- <p>Memtable的查找接口，根据一个<strong>LookupKey</strong>找到响应的记录，函数声明：</p>
- <pre class="language-"><code>bool MemTable::Get(const LookupKey& key, std::string* value, Status* s)
- </code></pre><p>函数实现如下：</p>
- <pre class="language-"><code>Slice memkey = key.memtable_key();
- Table::Iterator iter(&table_);
- iter.Seek(memkey.data());
- // seek到value>= memkey.data()的第一个记录
- if (iter.Valid())
- {
- // 这里不需要再检查sequence number了，因为Seek()已经跳过了所有
- // 值更大的sequence number了
- const char* entry = iter.key();
- uint32_t key_length;
- const char* key_ptr = GetVarint32Ptr(entry, entry+5,
- &key_length);
- // 比较user key是否相同，key_ptr开始的len(internal key) -8 byte是user key
- if (comparator_.comparator.user_comparator()->Compare
- (Slice(key_ptr, key_length - 8), key.user_key()) == 0)
- {
- // len(internal key)的后8byte是 |sequence number | value type|
- const uint64_t tag = DecodeFixed64(key_ptr + key_length - 8);
- switch (static_cast<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ValueType</span><span class="token punctuation">></span></span>(tag & 0xff))
- {
- case kTypeValue:
- {
- // 只取出value
- Slice v = GetLengthPrefixedSlice(key_ptr + key_length);
- value->assign(v.data(), v.size());
- return true;
- }
- case kTypeDeletion:
- *s = Status::NotFound(Slice());
- return true;
- }
- }
- }
- return false;
- </code></pre><p>这段代码，主要就是一个<strong>Seek函数</strong>，根据传入的LookupmKey得到在emtable中存储的key，然后调用Skip list::Iterator的Seek函数查找。Seek<strong>直接调用</strong>Skip list的FindGreaterOrEqual(key)接口，返回<strong>大于等于key的Iterator</strong>。然后取出user key判断时候和传入的user key相同，如果<strong>相同</strong>则<strong>取出value</strong>，如果记录的Value Type为kTypeDeletion，返回Status::NotFound(Slice())。</p>
- <h3 id="49-小结"><a name="49-小结" class="anchor-navigation-ex-anchor" href="#49-小结"><i class="fa fa-link" aria-hidden="true"></i></a>4.9 小结</h3>
- <p>Memtable到此就分析完毕了，本质上就是一个有序的Skip list，排序基于user key的sequence number，其<strong>排序比较依据</strong>依次是：</p>
- <ol>
- <li><strong>首先根据user key按升序排列</strong></li>
- <li><strong>然后根据sequence number按降序排列</strong></li>
- <li><strong>最后根据value type按降序排列（这个其实无关紧要）</strong></li>
- </ol>
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