[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - concurrent reading & read ahead with SimpleReadWriteEJBLock

[arunkrishnank]

Hello,

In my project we need to use read-ahead strategies. I have a situation where concurrent read access to the bean have to be allowed. Since for the read-ahead strategies to work the transaction attribute must be Required/RequiresNew I have set it as Required.

I have extended the Standard CMP entity bean and created a container configuration with SimpleReadWriteEJBLock as locking policy. For the beans I have specified the optimistic locking strategy with time-stamp column approach. The methods have a Required transaction attribute set.

Now when concurrent read access occurs TrasactionRolledBackException is happening due to read time out. I cannot use read only entity beans since such beans are not part of transaction and read ahead strategies will have a negative performance impact.

Can somebody provide some clues to fix the issue?

What I need is,
1. Concurrent read access is permitted
2. read-ahead strategies should work properly

Any Ideas?

Thanks
Arun K




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