How to Integrate tomcat with memcahed for session clustering

Integrating tomcat with memcached for session clustering

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

It’s bit confusing there. Will make it simple for you.

Download below four jars to your tomcat lib folder:

     1)  memcached-session-manager-1.6.4.jar

     2)   memcached-session-manager-tc7-1.6.4.jar

     3)  spymemcached-2.8.12.jar

     4)  couchbase-client-1.1.4.jar

And add below configuration in your context.xml file located inside /conf folder of tomcat.

<!--    <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />   -->  

     <Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"

                 memcachedNodes="n1:web1.prod:11211,n2:web2.prod:11211"

                 failoverNodes="n2"

                 requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$"

        />

Restart your application and you are done with your tomcat-memcache integration. Wasn’t it quiet simple :)....

Few things to remember:

Tomcat-1 (t1) will primarily store it's sessions in memcached-2 (m2) which is running on another machine (m2 is a regular node for t1). Only if m2 is not available, t1 will store it's sessions in memcached-1 (m1, m1 is the failoverNode for t1). With this configuration, sessions won't be lost when machine 1 (serving t1 and m1) crashes.

<t1>   <t2>
  . \ / .
  .  X  .
  . / \ .
<m1>   <m2>

The default strategy uses java serialization and is already provided by the memcached-session-manager jar.