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Andrew,

Andrew Hole wrote:
| Why is session unbound called after cluster failover?

What value is being unbound?

| Two more questions: -- In a scenario with two nodes, if I shutdown
| one, the other is instantly ready to receive and respond to requests,
| or it is necessary to wait a while?

It depends on how you set up your cluster. If you have distributed
sessions, then any other node can pick up right where the other left
off. If not, the user might have to log-in again in order for you to get
the session set up properly.

| In a production scenario we cannot wait, because requests are
| frequently. -- Is there any recommended configuration (basically If
| one tomcat crashes I want that the other responds immediately to the
| requests)?

If you want complete, immediate failover, you need to use distributed
sessions, have all nodes participate in the cluster, and have a way to
route traffic to the TC instances (using a lb appliance, httpd + mod_jk,
or some other mechanism).

- -chris
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