high load web application, need to select a replication stra

edavis Dec 6, 2005 2:51 PM

Hello,
we are starting the development of a large web applicacion that will server many users (20k concurrent users, 350k registered users), we selected Jboss as the AS for the clustering features and the licence scheme now I need to pick the right strategy for the replication of the cluster.

This is the strategy I have so far, PLEASE correct me if Im wrong.

1.- HTTP-Session replication: The application is not critical, so if one of the nodes goes down is aceptable for the end-user to loose the session and start all over in another node, so I wont replicate the http-session info and will use sticky sessions.

2.- Stateless Session beans replication: Do I need to set @Clustered this beans? I mean they are stateless, each node should have hes own pool, or am I missunderstanding something?

3.- Entity Bean: to boost performance I should set @Clustered and replicate this beans because some instances of this beans will be used a ton more than the others.

btw. english is not my main language so please excuse me for the spelling and gramatical errors.

1. Re: high load web application, need to select a replication

edavis Dec 6, 2005 3:07 PM (in response to edavis)

The other point I need to determine is the database, wihch one to use? mysql or postgres? in the event that I need to cluster the DB aswell, which one is more fast/reliable?
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2. Re: high load web application, need to select a replication

brian.stansberry Dec 6, 2005 3:20 PM (in response to edavis)

What you describe sounds correct.

I'm assuming here the client for your SLSB is the web tier. Adding @Clustered to your SLSB allows the web tier to make calls on beans on another server. The benefit of this is if the bean is unavailable on the local machine, the web tier can still work. The downside is calls will be remote, therefore serialized. If your SLSB is going to have the same lifecycle as the web app (i.e. deployed as a unit), you're better of not using @Clustered and ensuring all calls remain in the same VM.
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3. Re: high load web application, need to select a replication

edavis Dec 6, 2005 4:20 PM (in response to edavis)

Great, thx for the answer, SLSB and the web tier will be deployed as a unit, so I wont get it @Clustered.

About the Entity Beans, performance sake they should be @Clustered, right?
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