[jboss-dev-forums] [Design of JBoss Portal] - portal clustering problem whne using optimistic locking and

[prabhat.jha@jboss.com]

The problem is described at JBPORTAL-1879 and I have narrowed down it to configuration where this problem can be easily replicated.

It only happens when optimistic locking used with REPL_SYNC as cache_mode.


<attribute name="NodeLockingScheme">OPTIMISTIC</attribute>			
  | <attribute name="IsolationLevel">REPEATABLE_READ</attribute>			
  | <attribute name="CacheMode">REPL_SYNC</attribute>			
  | 

Changing CacheMode to REPL_ASYNC or LOCAL as well as using Pessimistic locking  does not result into this problem. I think we need to look into following possibilities besides looking into portal code base 

1. Problem with org.hibernate.cache.OptimisticTreeCache or the way we are using it 
2. Deadlock in org.jboss.cache.lock.ReadWriteLockWithUpgrade




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