Tomcat memcached-session-manager

项目地址

https://code.google.com/archive/p/memcached-session-manager/

Sticky Session, Non Sticky Session解释：

A tomcat high-availability solution that additionally stores sessions in a memcached compatible key-value store for session failover, while reading them from local memory for optimal performance (for sticky sessions). For non-sticky sessions the memcached compatible backend is used as session store (keeping a copy of the session in a secondary memcached node). "memcached compatible" here refers to the memcached protocol, therefore the backend can be any (if you like persistent) solution "speaking" memcached (e.g. memcachedb, membaseetc.).

大概意思就是，Sticky Session粘性session，每次request会先从local tomcat jvm获取session，如果没有此session会从memcached同步(通过sessionid)，response之后也会同步回去到memcached；Non Sticky Session非粘性session，统一session管理到memcached，所有的tomcat直接从memcached获取session。

配置步骤：

https://code.google.com/archive/p/memcached-session-manager/wikis/SetupAndConfiguration.wiki

1 拷贝jar包到lib

memcached-session-manager-2.1.1.jar

memcached-session-manager-tc7-2.1.1.jar

spymemcached-2.11.1.jar

javolution-5.4.3.1.jar

msm-javolution-serializer-2.1.1.jar

2 配置context.xml --non-sticky session配置方法:

        <Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager" 
                memcachedNodes="n1:127.0.0.1:11211"
                sticky="false"
                sessionBackupAsync="false"
                lockingMode="auto"
                requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$" 
                transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"
        />

3 安装memcached

yum -y install memcached

4 启动tomcat，验证是否生效