What is and what is not replicated in a glassfish cluster with a mod_jk load balancer?

Posted by Navigateur on Server Fault See other posts from Server Fault or by Navigateur
Published on 2012-06-30T14:45:26Z Indexed on 2012/06/30 15:18 UTC
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replication

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cluster

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glassfish

I have a Glassfish (3.1.2) cluster over 2 computers as nodes, with a mod_jk load balancer.

Are servlet instance variables replicated perfectly? If not, how do I make sure it is?

Are all actions, including method calls and disk writes, replicated perfectly? If not, how do I make sure they are?

These may seem like stupid questions, but I'm not seeking "load balancing" as much as I am seeking exact replication to enable future upgrading without any service interruption. How do I achieve this if it is not already the case?

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