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memcached全面剖析

版本 1.0

目

录

第 1 章 memcached 的基础........................................................5

memcached 是什么？ ...............................................................................................................5

memcached 的特征...................................................................................................................6

协议简单.....................................................................................................................................6

基于 libevent 的事件处理...........................................................................................................6

内置内存存储方式.....................................................................................................................6

memcached 不互相通信的分布式.............................................................................................6

安装 memcached.......................................................................................................................7

memcached 的安装.....................................................................................................................7

memcached 的启动.....................................................................................................................8

用客户端连接...........................................................................................................................8

使用 Cache::Memcached...........................................................................................................9

使用 Cache::Memcached 连接 memcached................................................................................9

保存数据...................................................................................................................................10

获取数据...................................................................................................................................10

删除数据...................................................................................................................................10

增一和减一操作.......................................................................................................................10

总结.........................................................................................................................................11

第 2 章理解 memcached 的内存存储 ..............................................................................................12

Slab Allocation 机制：整理内存以便重复使用 ...................................................................12

Slab Allocation 的主要术语 .....................................................................................................13

在 Slab 中缓存记录的原理....................................................................................................13

Slab Allocator 的缺点.............................................................................................................13

使用 Growth Factor 进行调优 ................................................................................................14

查看 memcached 的内部状态 ................................................................................................15

查看 slabs 的使用状况 ...........................................................................................................16

总结.........................................................................................................................................17

第 3 章 memcached 的删除机制和发展方向 ...................................................................................18

memcached 在数据删除方面有效利用资源 .........................................................................18

数据不会真正从 memcached 中消失.......................................................................................18

Lazy Expiration .........................................................................................................................18

LRU：从缓存中有效删除数据的原理 .................................................................................18

memcached 的最新发展方向.................................................................................................18

关于二进制协议.......................................................................................................................19

二进制协议的格式...................................................................................................................19

HEADER 中引人注目的地方..................................................................................................20

外部引擎支持.........................................................................................................................20

外部引擎支持的必要性...........................................................................................................20

简单 API 设计的成功的关键 ...................................................................................................21

重新审视现在的体系...............................................................................................................21

总结.........................................................................................................................................22

第 4 章 memcached 的分布式算法...................................................................................................23

memcached 的分布式.............................................................................................................23

memcached 的分布式是什么意思？ .......................................................................................23

Cache::Memcached 的分布式方法 ........................................................................................25

根据余数计算分散...................................................................................................................25

根据余数计算分散的缺点.......................................................................................................26

Consistent Hashing..................................................................................................................27

Consistent Hashing 的简单说明 ...............................................................................................27

支持 Consistent Hashing 的函数库 ..........................................................................................29

总结.........................................................................................................................................29

第 5 章 memcached 的应用和兼容程序...........................................................................................30

mixi 案例研究.........................................................................................................................30

服务器配置和数量...................................................................................................................30

memcached 进程 .......................................................................................................................31

memcached 使用方法和客户端 ...............................................................................................31

memcached 应用经验.............................................................................................................32

通过 daemontools 启动.............................................................................................................33

监视...........................................................................................................................................33

memcached 的性能 ...................................................................................................................33

兼容应用程序.........................................................................................................................35

Tokyo Tyrant 案例.....................................................................................................................35

总结.........................................................................................................................................36

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