I want to write a dissertation on J2EE Clustering.
My thought is that how to simplify the way of EJB Cluster and combine with cache.
could you give me some advice about it?
        Thank you.
                                     Best Regards,
                                      funson

Hi Fang,

I want to write a dissertation on J2EE Clustering.My thought is that how to simplify the way of EJB Cluster and combine with cache. could you give me some advice about it?

Take a look at JCache and Coherence. Coherence makes clustered caching as simple as local caching.

Later,
Rob Misek
Tangosol, Inc.
Coherence: It just works.

Could you tell me how does the EJB cluster work?
Thank you!

Hi,

J2EE clustering is done on more levels.

Web tier : Session replication (for example in tomcat) and load balancing (for example apache with mod_jk or director) can be used to gain performance but also have fail over.

Ejb tier : Multiple ejb containers could be used with a shared or replicated jndi tree. This offers load balancing and fail over. But some problems are for example : reliable JNDI replication.

Storage tier : The persistent storage (e.g database) must also be replicated in order not to be the single point of failure and to increase the performance. This could be done by commercial products (Oracle RA cluster, IBM, ...) but an open way could also be C-JDBC.

Georges

Some good links which explains this are :

http://www.javaworld.com/jw-02-2001/jw-0223-extremescale.html

http://www.javaworld.com/javaworld/jw-08-2001/jw-0803-extremescale2.html