[jboss-jira] [JBoss JIRA] Created: (EJBTHREE-707) TreeCacheProviderHook.isMinimalPutsEnabledByDefault() wrong

[Owen Taylor (JIRA)]

TreeCacheProviderHook.isMinimalPutsEnabledByDefault() wrong
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                 Key: EJBTHREE-707
                 URL: http://jira.jboss.com/jira/browse/EJBTHREE-707
             Project: EJB 3.0
          Issue Type: Bug
            Reporter: Owen Taylor
            Priority: Minor


org.jboss.ejb3.entity.TreeCacheProviderHook.isMinimalPutsEnabledByDefault()  returns false,
which means "don't check to see if values are in the cache before inserting them again", but
that's a very bad setting for the TreeCache

 - It causes unnecessary replication between the nodes of a cluster
 - It tends to cause lock conflicts because the transaction putting data
   into the cache has to get a (briefly) get a write lock. There are hacky workarounds in the
   hibernate TreeCache code not to deadlock in this code, but you still get log spew.

The TreeCacheProvider provided with Hibernate (no JMX integration) returns true 
isMinimalPutsEnabledByDefault() as it should, so I think this is just an oversight.

You can of course easily work around the problem by setting the value explicitly in the
hibernate properties.


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