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From "Nimish Chourey , Tidel Park - Chennai" <Nimi...@msdc.hcltech.com>
Subject RE: [OT] Clustering / Session Replication
Date Wed, 16 Jul 2003 08:41:25 GMT
There as a similar thread on this topic .Serach for "Session Management
using EJB" 
probably that would help ..



> -----Original Message-----
> From: Jan Zimmek [mailto:jzimmek@morelogs.de]
> Sent: Wednesday, July 16, 2003 1:41 PM
> To: struts-user@jakarta.apache.org
> Subject: [OT] Clustering / Session Replication
> 
> 
> Hi,
> 
> I read an article about clustering in tomcat on theserverside.com, but
> have some questions about it.
> 
> There is a statement to use "In-Memory"-Replication in favour of
> "Database/Filesystem"-Replication to avoid problems like (speed,
> external dependencies, ...).
> 
> Most of our projects make use of gui-components like trees, pager and
> pagecontrols, whose state are stored in the HttpSession-Object.
> Depending on the project, the amount of used memory for these objects
> can be really huge ( in a equivalent php version, a serialized session
> can be up to 1mb ).
> 
> Would this means, is that 200 concurrent HttpSessions ( each 
> one ~ 1mb )
> would be replicated to each Tomcat-Server in my cluster and therefore
> each server requires ~ 200mb RAM to hold all concurrent
> HttpSession-Objects when using "In-Memory"-Replication ?
> 
> Are there any mechanisms to share those huge HttpSessions over several
> servers without the needed RAM of ~200mb per server ?
> 
> 
> Any comment would be really appreciated.
> 
> 
> regards,
> Jan Zimmek
> 
> 

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