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- </a>
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-
- </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">
-
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- <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">
-
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- <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>
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-
- </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
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- </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">
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- <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">
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- <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">
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- <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">
-
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- 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">
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- <a href="../libevent源码深度剖析/libevent源码深度剖析11.html">
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- libevent源码深度剖析11
-
- </a>
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-
- </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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- <a href="../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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- <li class="chapter " data-level="7.1.13" data-path="../libevent源码深度剖析/libevent源码深度剖析13.html">
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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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- </a>
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- <ul class="articles">
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- leveldb源码分析1
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- <li class="chapter " data-level="7.2.2" data-path="leveldb源码分析2.html">
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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 " 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 active" 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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- <li class="chapter " data-level="7.2.9" data-path="leveldb源码分析9.html">
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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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- <li class="chapter " data-level="7.2.11" data-path="leveldb源码分析11.html">
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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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- </a>
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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>
-
- </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>
-
-
- </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>
-
-
- </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>
-
-
- </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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- <li class="chapter " data-level="9.1" data-path="../游戏开发专题/">
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- 游戏开发专题
-
- </a>
-
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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>
-
-
- </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>
-
-
- </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">
-
-
- 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
-
- </a>
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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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- <a href="../程序员面试题精讲/">
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- 程序员面试题精讲
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-
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- <ul class="articles">
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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">
-
- <a href="../程序员面试题精讲/网络通信题目集锦.html">
-
-
- 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">
-
-
- Linux C/C++后端开发面试问哪些问题
-
- </a>
-
-
- </li>
-
- </ul>
-
- </li>
-
- <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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- <li class="chapter " data-level="10.2.2" data-path="../职业规划/聊聊技术人员的常见的职业问题.html">
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- <a href="../职业规划/聊聊技术人员的常见的职业问题.html">
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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6"><b></b>leveldb源码分析6</a></li><ul><li><span class="title-icon "></span><a href="#5-操作log-2"><b></b>5. 操作Log 2</a></li><ul><li><span class="title-icon "></span><a href="#53-读日志"><b></b>5.3 读日志</a></li></ul></ul></ul></div><h1 id="leveldb源码分析6"><a name="leveldb源码分析6" class="anchor-navigation-ex-anchor" href="#leveldb源码分析6"><i class="fa fa-link" aria-hidden="true"></i></a>leveldb源码分析6</h1>
- <p>本系列《leveldb源码分析》共有22篇文章,这是第六篇。</p>
- <h2 id="5-操作log-2"><a name="5-操作log-2" class="anchor-navigation-ex-anchor" href="#5-操作log-2"><i class="fa fa-link" aria-hidden="true"></i></a>5. 操作Log 2</h2>
- <h3 id="53-读日志"><a name="53-读日志" class="anchor-navigation-ex-anchor" href="#53-读日志"><i class="fa fa-link" aria-hidden="true"></i></a>5.3 读日志</h3>
- <p>日志读取显然比写入要复杂,要检查<strong>checksum</strong>,检查是否有损坏等等,处理各种错误。</p>
- <h4 id="531-类层次"><a name="531-类层次" class="anchor-navigation-ex-anchor" href="#531-类层次"><i class="fa fa-link" aria-hidden="true"></i></a>5.3.1 类层次</h4>
- <p>Reader主要用到了两个接口,一个是<strong>汇报错误的Reporter</strong>,另一个是log文件<strong>读取类SequentialFile</strong>。</p>
- <p>Reporter的接口只有<strong>一个</strong>:</p>
- <pre class="language-"><code>void Corruption(size_t bytes,const Status& status);
- </code></pre><p>SequentialFile有<strong>两个</strong>接口:</p>
- <pre class="language-"><code>Status Read(size_t n, Slice* result, char* scratch);
- Status Skip(uint64_t n);
- </code></pre><p>说明下,Read接口有一个<strong>result</strong>参数传递结果就行了,为何还有一个scratch呢,这个就和Slice相关了。它的字符串指针是传入的外部char*指针,自己并不负责内存的管理与分配。因此Read接口需要调用者提供一个字符串指针,实际存放字符串的地方。</p>
- <p><img src="../imgs/leveldb7.webp" alt=""></p>
- <p>Reader类有几个成员变量,需要注意:</p>
- <pre class="language-"><code>bool eof_;
- // 上次Read()返回长度< kBlockSize,暗示到了文件结尾EOF
- uint64_t last_record_offset_; // 函数ReadRecord返回的上一个record的偏移
- uint64_t end_of_buffer_offset_;// 当前的读取偏移
- uint64_t const initial_offset_;// 偏移,从哪里开始读取第一条record
- Slice buffer_; // 读取的内容
- </code></pre><h4 id="532日志读取流程"><a name="532日志读取流程" class="anchor-navigation-ex-anchor" href="#532日志读取流程"><i class="fa fa-link" aria-hidden="true"></i></a>5.3.2日志读取流程</h4>
- <p>Reader只有一个接口,那就是ReadRecord,下面来分析下这个函数。</p>
- <h6 id="s1-根据initial-offset跳转到调用者指定的位置,开始读取日志文件。跳转就是直接调用sequentialfile的seek接口。"><a name="s1-根据initial-offset跳转到调用者指定的位置,开始读取日志文件。跳转就是直接调用sequentialfile的seek接口。" class="anchor-navigation-ex-anchor" href="#s1-根据initial-offset跳转到调用者指定的位置,开始读取日志文件。跳转就是直接调用sequentialfile的seek接口。"><i class="fa fa-link" aria-hidden="true"></i></a>S1 根据initial offset跳转到调用者指定的位置,开始读取日志文件。跳转就是直接调用SequentialFile的Seek接口。</h6>
- <p>另外,需要先调整调用者传入的<strong>initialoffset</strong>参数,调整和跳转逻辑在SkipToInitialBlock函数中。</p>
- <pre class="language-"><code>if (last_record_offset_ <initial_offset_)
- { // 当前偏移 < 指定的偏移,需要Seek
- if (!SkipToInitialBlock()) return false;
- }
- </code></pre><p>下面的代码是SkipToInitialBlock函数调整read offset的逻辑:</p>
- <pre class="language-"><code>// 计算在block内的偏移位置,并圆整到开始读取block的起始位置
- size_t offset_in_block =initial_offset_ % kBlockSize;
- uint64_t block_start_location =initial_offset_ - offset_in_block;
- // 如果偏移在最后的6byte里,肯定不是一条完整的记录,跳到下一个block
- if (offset_in_block >kBlockSize - 6)
- {
- offset_in_block = 0;
- block_start_location +=kBlockSize;
- }
- end_of_buffer_offset_ =block_start_location;
- // 设置读取偏移
- if (block_start_location > 0) file_->Skip(block_start_location); // 跳转
- </code></pre><p>首先计算出在<strong>block</strong>内的偏移位置,然后圆整到要读取block的起始位置。开始读取日志的时候都要保证读取的是完整的block,这就是<strong>调整的目的</strong>。</p>
- <p>同时成员变量end<em>of_buffer_offset</em><strong>记录</strong>了这个值,在后续读取中会用到。</p>
- <h6 id="s2在开始while循环前首先初始化几个标记:"><a name="s2在开始while循环前首先初始化几个标记:" class="anchor-navigation-ex-anchor" href="#s2在开始while循环前首先初始化几个标记:"><i class="fa fa-link" aria-hidden="true"></i></a>S2在开始while循环前首先初始化几个标记:</h6>
- <pre class="language-"><code>// 当前是否在fragment内,也就是遇到了FIRST 类型的record
- bool in_fragmented_record = false;
- uint64_t prospective_record_offset = 0; // 我们正在读取的逻辑record的偏移
- </code></pre><h6 id="s3-进入到whiletrue循环,直到读取到klasttype或者kfulltype的record,或者到了文件结尾。从日志文件读取完整的record是readphysicalrecord函数完成的。"><a name="s3-进入到whiletrue循环,直到读取到klasttype或者kfulltype的record,或者到了文件结尾。从日志文件读取完整的record是readphysicalrecord函数完成的。" class="anchor-navigation-ex-anchor" href="#s3-进入到whiletrue循环,直到读取到klasttype或者kfulltype的record,或者到了文件结尾。从日志文件读取完整的record是readphysicalrecord函数完成的。"><i class="fa fa-link" aria-hidden="true"></i></a>S3 进入到while(true)循环,直到读取到KLastType或者KFullType的record,或者到了文件结尾。从日志文件读取完整的record是ReadPhysicalRecord函数完成的。</h6>
- <p>读取出现错误时,并不会退出循环,而是<strong>汇报错误</strong>,继续执行,直到<strong>成功读取</strong>一条user record,或者遇到文件结尾。
- <strong>S3.1 从文件读取record</strong></p>
- <pre class="language-"><code>uint64_t physical_record_offset = end_of_buffer_offset_ -buffer_.size();
- const unsigned int record_type = ReadPhysicalRecord(&fragment);
- </code></pre><p>physical_record_offset存储的是当前正在读取的record的偏移值。接下来根据不同的record_type类型,分别处理,一共有7种情况:</p>
- <p><strong>S3.2 FULL type(kFullType),表明是一条完整的log record,成功返回读取的user record数据。另外需要对早期版本做些work around,早期的Leveldb会在block的结尾生产一条空的kFirstType log record。</strong></p>
- <pre class="language-"><code>if (in_fragmented_record)
- {
- if (scratch->empty())in_fragmented_record = false;
- else ReportCorruption(scratch->size(),"partial record without end(1)");
- }
- prospective_record_offset= physical_record_offset;
- scratch->clear(); // 清空scratch,读取成功不需要返回scratch数据
- *record = fragment;
- last_record_offset_ =prospective_record_offset; // 更新last record offset
- return true;
- </code></pre><p><strong>S3.3 FIRST type(kFirstType),表明是一系列logrecord(fragment)的第一个record。同样需要对早期版本做work around。</strong></p>
- <p>把数据读取到scratch中,直到<strong>成功读取</strong>了LAST类型的log record,才把数据返回到<strong>result</strong>中,继续下次的读取循环。</p>
- <p>如果再次遇到FIRSTor FULL类型的log record,如果scratch不为空,就说明日志文件有错误。</p>
- <pre class="language-"><code>if (in_fragmented_record)
- {
- if (scratch->empty())in_fragmented_record = false;
- else ReportCorruption(scratch->size(),"partial record without end(2)");
- }
- prospective_record_offset =physical_record_offset;
- scratch->assign(fragment.data(), fragment.size());
- //赋值给scratch
- in_fragmented_record =true;
- // 设置fragment标记为true
- </code></pre><p><strong>S3.4 MIDDLE type(kMiddleType),这个处理很简单,如果不是在fragment中,报告错误,否则直接append到scratch中就可以了。</strong></p>
- <pre class="language-"><code>if (!in_fragmented_record)
- {
- ReportCorruption(fragment.size(),
- "missing start of fragmentedrecord(1)");
- }
- else {scratch->append(fragment.data(),fragment.size());}
- </code></pre><p><strong>S3.5 LAST type(kLastType),说明是一系列log record(fragment)中的最后一条。如果不在fragment中,报告错误。</strong></p>
- <pre class="language-"><code>if (!in_fragmented_record)
- {
- ReportCorruption(fragment.size(),
- "missing start of fragmentedrecord(2)");
- }
- else
- {
- scratch->append(fragment.data(), fragment.size());
- *record = Slice(*scratch);
- last_record_offset_ =prospective_record_offset;
- return true;
- }
- </code></pre><p>至此,4种正常的log record type已经处理完成,下面3种情况是其它的错误处理,类型声明在<strong>Logger类</strong>中:</p>
- <pre class="language-"><code>enum
- {
- kEof = kMaxRecordType + 1, // 遇到文件结尾
- // 非法的record,当前有3中情况会返回bad record:
- // * CRC校验失败 (ReadPhysicalRecord reports adrop)
- // * 长度为0 (No drop is reported)
- // * 在指定的initial_offset之外 (No drop is reported)
- kBadRecord = kMaxRecordType +2
- };
- </code></pre><p><strong>S3.6 遇到文件结尾kEof,返回false。不返回任何结果。</strong></p>
- <pre class="language-"><code>if (in_fragmented_record)
- {
- ReportCorruption(scratch->size(), "partial record withoutend(3)");
- scratch->clear();
- }
- return false;
- </code></pre><p><strong>S3.7 非法的record(kBadRecord),如果在fragment中,则报告错误。</strong></p>
- <pre class="language-"><code>if (in_fragmented_record)
- {
- ReportCorruption(scratch->size(), "error in middle ofrecord");
- in_fragmented_record = false;
- scratch->clear();
- }
- </code></pre><p><strong>S3.8 缺省分支,遇到非法的record 类型,报告错误,清空scratch。</strong></p>
- <pre class="language-"><code>ReportCorruption(…, "unknownrecord type %u", record_type);
- in_fragmented_record = false; // 重置fragment标记
- scratch->clear();// 清空scratch
- </code></pre><p>上面就是ReadRecord的全部逻辑,解释起来还有些费力。</p>
- <h4 id="533-从log文件读取record"><a name="533-从log文件读取record" class="anchor-navigation-ex-anchor" href="#533-从log文件读取record"><i class="fa fa-link" aria-hidden="true"></i></a>5.3.3 从log文件读取record</h4>
- <p>就是前面讲过的<strong>ReadPhysicalRecord函数</strong>,它调用SequentialFile的Read接口,从文件读取数据。</p>
- <p>该函数开始就进入了一个<strong>while(true)循环</strong>,其目的是为了读取到一个完整的record。读取的内容存放在成员变量<strong>buffer_</strong>中。这样的逻辑有些奇怪,实际上,完全不需要一个while(true)循环的。</p>
- <p>函数基本逻辑如下:</p>
- <h6 id="s1-如果buffer小于block-header大小kheadersize,进入如下的几个分支:"><a name="s1-如果buffer小于block-header大小kheadersize,进入如下的几个分支:" class="anchor-navigation-ex-anchor" href="#s1-如果buffer小于block-header大小kheadersize,进入如下的几个分支:"><i class="fa fa-link" aria-hidden="true"></i></a>S1 如果buffer_小于block header大小kHeaderSize,进入如下的几个分支:</h6>
- <p><strong>S1.1 如果eof_为false,表明还没有到文件结尾,清空buffer,并读取数据。</strong></p>
- <pre class="language-"><code>buffer_.clear();
- // 因为上次肯定读取了一个完整的record
- Status status =file_->Read(kBlockSize, &buffer_, backing_store_);
- end_of_buffer_offset_ +=buffer_.size();
- // 更新buffer读取偏移值
- if (!status.ok())
- {
- // 读取失败,设置eof_为true,报告错误并返回kEof
- buffer_.clear();
- ReportDrop(kBlockSize,status);
- eof_ = true;
- return kEof;
- }
- else if (buffer_.size()< kBlockSize)
- {
- eof_ = true; // 实际读取字节<指定(Block Size),表明到了文件结尾
- }
- continue; // 继续下次循环
- </code></pre><p><strong>S1.2 如果eof_为true并且buffer为空,表明已经到了文件结尾,正常结束,返回kEof。</strong></p>
- <p><strong>S1.3 否则,也就是eof_为true,buffer不为空,说明文件结尾包含了一个不完整的record,报告错误,返回kEof。</strong></p>
- <pre class="language-"><code>size_t drop_size =buffer_.size();
- buffer_.clear();
- ReportCorruption(drop_size,"truncated record at end of file");
- return kEof;
- </code></pre><h6 id="s2-进入到这里表明上次循环中的read读取到了一个完整的log-record,continue后的第二次循环判断buffersize--kheadersize将执行到此处。"><a name="s2-进入到这里表明上次循环中的read读取到了一个完整的log-record,continue后的第二次循环判断buffersize--kheadersize将执行到此处。" class="anchor-navigation-ex-anchor" href="#s2-进入到这里表明上次循环中的read读取到了一个完整的log-record,continue后的第二次循环判断buffersize--kheadersize将执行到此处。"><i class="fa fa-link" aria-hidden="true"></i></a>S2 进入到这里表明上次循环中的Read读取到了一个完整的log record,continue后的第二次循环判断buffer_.size() >= kHeaderSize将执行到此处。</h6>
- <p>解析出log record的header部分,判断长度是否一致。</p>
- <p>根据log的格式,前4byte是crc32。后面就是length和type,解析如下:</p>
- <pre class="language-"><code>const char* header = buffer_.data();
- const uint32_t length = ((header[4])& 0xff) | ((header[5]&0xff)<<8)
- const uint32_t type = header[6];
- if (kHeaderSize + length >buffer_.size())
- {
- // 长度超出了,汇报错误
- size_t drop_size =buffer_.size();
- buffer_.clear();
- ReportCorruption(drop_size,"bad record length");
- return kBadRecord; // 返回kBadRecord
- }
- if (type == kZeroType&& length == 0)
- {
- // 对于Zero Type类型,不汇报错误
- buffer_.clear();
- return kBadRecord; // 依然返回kBadRecord
- }
- </code></pre><h6 id="s3-校验crc32,如果校验出错,则汇报错误,并返回kbadrecord。"><a name="s3-校验crc32,如果校验出错,则汇报错误,并返回kbadrecord。" class="anchor-navigation-ex-anchor" href="#s3-校验crc32,如果校验出错,则汇报错误,并返回kbadrecord。"><i class="fa fa-link" aria-hidden="true"></i></a>S3 校验CRC32,如果校验出错,则汇报错误,并返回kBadRecord。</h6>
- <h6 id="s4-如果record的开始位置在initial-offset之前,则跳过,并返回kbadrecord,否则返回record数据和type。"><a name="s4-如果record的开始位置在initial-offset之前,则跳过,并返回kbadrecord,否则返回record数据和type。" class="anchor-navigation-ex-anchor" href="#s4-如果record的开始位置在initial-offset之前,则跳过,并返回kbadrecord,否则返回record数据和type。"><i class="fa fa-link" aria-hidden="true"></i></a>S4 如果record的开始位置在initial offset之前,则跳过,并返回kBadRecord,否则返回record数据和type。</h6>
- <pre class="language-"><code>buffer_.remove_prefix(kHeaderSize+ length);
- if (end_of_buffer_offset_ -buffer_.size() - kHeaderSize -
- length < initial_offset_)
- {
- result->clear();
- return kBadRecord;
- }
- *result = Slice(header +kHeaderSize, length);
- return type;
- </code></pre><p>从log文件读取record的逻辑就是这样的。至此,读日志的逻辑也完成了。接下来将进入磁盘存储的<strong>sstable</strong>部分。</p>
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