[jboss-dev-forums] [Design of JBoss Portal] - Re: portal clustering problem when using optimistic locking

[prabhat.jha@jboss.com]

Brian, I reran the tests with PL and READ_COMMITTED isolation level.
anonymous wrote : 
  | 
  |  
  |         jboss:service=Naming
  |         jboss:service=TransactionManager
  |         
  |                 org.jboss.cache.JBossTransactionManagerLookup
  |         
  |         PESSIMISTIC
  |         READ_COMMITTED
  |         REPL_SYNC
  | 

The result is definitely better and at par with what I was getting with OL. However, problem with scalability with {4,5} node cluster still exists. I get almost linear scalability in {1,2,3} node cluster but load handled in {4,5} node cluster is more or less same as that of a 2-node cluster. I have not tested with more than 5 node cluster to see if pattern continues. 

Also, I am not sure based on this test if I should relax the isolation level from REPEATABLE_READ to READ_COMMITTED. Currently, RR is default isolation level in portal. Thoughts on this?

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