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Why do sticky sessions matter when session replication turned on in Tomcat

0 votes
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Setup:
- Two physical servers each running Tomcat 7.0.42
- Brocade load balancer in front

The load balancer is set to source IP persistence for 5 minutes. This time can be changed of course.

The thing I don't understand is 5 minutes or 5 hours - at then end that time limit the user can be sent to the other server and lose data stored in the session.

So why do sticky sessions matter when session replication turned on in Tomcat? Is a performance issue?

posted Jul 24, 2013 by anonymous

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1 Answer

+1 vote

Sticky sessions aren't really necessary when session replication is on. On the other hand, session information takes non-zero time to propagate between the members of the cluster, so using session
stickiness may reduce the risk of out-of-date sessions when a user randomly switches servers in the middle of a series of high-rate requests.

I would recommend setting the stickiness timeout to the same as the session timeout, assuming that the lb is updating the last-touch time for every request mentioning the session. If that's not happening, then it probably doesn't really matter what you set your session stickiness timeout to be.

answer Jul 24, 2013 by anonymous
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