Hello, All
What I lose if I size a system with Sticky HTTP Sessions on pres tier only, w/o clustering the EJB container instances ?
Suppose the arch is 4-tier one:
1. Apache + mod_caucho
2. Resin (2 instances) <- sticky HTTP sessions + session replication as well
3. JBoss (2 instances) <- separate instances or cluster ?
4. DB
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Scalability: Sticky Sessions vs.Clustering (2 messages)
- Posted by: Mike Skorik
- Posted on: July 01 2003 05:43 EDT
Threaded Messages (2)
- Scalability: Sticky Sessions vs.Clustering by Tim Dwelle on July 01 2003 13:55 EDT
- Scalability: Sticky Sessions vs.Clustering by Cameron Purdy on July 02 2003 07:57 EDT
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Scalability: Sticky Sessions vs.Clustering[ Go to top ]
- Posted by: Tim Dwelle
- Posted on: July 01 2003 13:55 EDT
- in response to Mike Skorik
What I lose if I size a system with Sticky HTTP Sessions on pres tier only, w/o clustering the EJB container instances ?
failover, essentially.
however, there is a certain communications overhead to clustering, so this may be an acceptable tradeoff.
-tim. -
Scalability: Sticky Sessions vs.Clustering[ Go to top ]
- Posted by: Cameron Purdy
- Posted on: July 02 2003 07:57 EDT
- in response to Tim Dwelle
If the EJB tier is stateless, you may even be able to get "failover" without clustering the EJB tier. It depends on how "smart" the client is when it goes to call the EJBs. If it knows what servers are up, and picks one of those to do the stateless call on, then you still get failover.
Peace,
Cameron Purdy
Tangosol, Inc.
Coherence: Easily share live data across a cluster!