Repcached实现Memcached主从复制功能工作原理repcached实现了memcached复制的功能，它是一个单master单slave的方案，但master/slave都是可读写的，而且可以相互
Repcached实现Memcached主从复制功能
工作原理
repcached实现了memcached复制的功能，它是一个单master单slave的方案，但master/slave都是可读写的，而且可以相互同步，如果master坏掉slave侦测到连接断了，它会自动listen而成为master，这时坏掉的master只能启用为slave，它们之间互换角色，才能保持复制功能，换句话说，master没有抢占功能；而如果slave坏掉，master也会侦测到连接断，它就会重新listen等待新的slave加入。
应用场景
用memcached做session共享或其它服务时会存在memcached的单点故障，如果memcached宕机，那么整个系统用户无法登陆(session)。
基于这种情况，采用repcached做memcached的主从冗余。
Repcached下载地址
Repcached安装方式
Repcached有两种安装方式：
1.补丁版本安装
先安装相应版本的memcached，，然后对应版本的Repcached补丁。
2.整合版本安装
直接安装整合版本的memcached
方式一：补丁版本安装
1. 安装Memcache，相关安装方法可以参见博文：
2. 下载对应的repcached版本补丁安装文件：
假设安装的memcahced版本为1.2.8，下载针对该版本最新的补丁:
方式二：整合版本安装
1. 安装libevent：
2. 将libevent的库文件添加到动态库中：
在最后添加如下行：
/usr/local/lib //此处为要添加的libevent库目录
重新加载动态lib库
注意：如果无此步骤，在启动memcached时，会提示看不到libevent的库文件。
3. 测试libevent是否安装成功：
4. 创建启动帐号：
5. 创建PID进程目录并修改所有者：
6. 安装整合memcached-repcached包：
注意：默认memcached单个进程只支持到2G内存，需要更大内存支持的话，需要打开64位支持，编译的时候加参数：
--enable-64bit
提示编译出错：
解决方案：
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