http://www.theserverside.com//patterns/ thread.jsp?thread_id=11280&article_count=20
/Lennart
tisdagen den 4 mars 2003 kl 13.27 skrev Davide:
Hi,
My staff is studing the porting of an online trading proprietary application with J2EE technology and JBoss. This application handles about 60.000 Tx per day. We need a cluster for fail over and load balancing scaling capabilities.
We made some test on a sigle JBoss instance using commit option A on entity beans obtaining encouraging results for a single PIV machine.
Then we setup a clustered two JBoss instances setting commit option B on our entity beans. In spite of two machine handling, each one, half of the load, performances has noticeably decreased.
The database was on a third machine on both the tests.
This application need to cache in memory large data structures loaded from DB. On client update transactions we perform complex calculations updating them.
Other clients that just browse data, obtain it directly form the memory cache.
In short the same old problem :-(
In the "old" C++ server, this goal was achieved through Shared Memory with an impressive speed...
Entity beans would be perfect if I can take advantage from cache bu,t in a cluster, right now JBoss doesn't support it.
Is there another tricky way to mantain a "static" global data structure in memory except entity beans ? Something that would work on a cluster too.
On a single JBoss instance I could write an MBean but I need a cluster, so this data structure should be automatically synchronized through the nodes.
Any suggestion would be greatly appreciate.
Thank You
Davide De Benedictis
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