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Enrique,

Enrique Arizón wrote:
| If you users sessions are simple tomcat sessions clustering will be
| enough but if you have complex session data structures (let's say for
| example a java.util.ArrayList/Hashtable) you will need custom
| solutions to sync sessions between clustered nodes.

Really? My experience has been that anything that properly implements
java.io.Serializable does just fine migrating from node to node. Sure,
migrating lots of data around a cluster is time-consuming and perhaps
would not be considered a best-practice, but the container-provided
clustering and session sync capabilities certainly do work.

I would argue that a small session footprint is critical to a robust web
application, clustered or not.

| Mysql makes a great help since it use in memory (RAM) storage for
| clustered tables

What are you talking about? The closest thing to "clustered tables" that
MySQL supports is the FEDERATED storage engine, and there are no
guarantees about RAM usage for it.

- -chris
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