Sticky session refers to the feature of many commercial load balancing solutions for web
to route the requests for a particular session to the same physical machine that serviced
the first request for that session. This is mainly used to ensure that the in-progress session
is not lost as a result of requests for a session being routed to different servers.

Since requests for a user are always routed to the same machine that first served the request
for that session, sticky sessions can cause uneven load distribution across servers. If the
first accessed server is down for any reason User may lose the Session Data no Session
Replication happens in Sticky Session.

Here is the Sample load balancer Set up with apache MOD_PROXY 

   ProxyPass / balancer://mycluster/ stickysession=JSESSIONID nofailover=On
        ProxyPassReverse / ajp://yourcompany.com:8009
        ProxyPassReverse / ajp://yourcompany.com:8009
        <Proxy balancer://mycluster>
          BalancerMember ajp://yourcompany.com:8009 loadfactor=20
          BalancerMember ajp://yourcompany.com:8009 loadfactor=5
          ProxySet lbmethod=byrequests
        </Proxy>

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