[jbosscache-dev] LockParentForChildInsertRemove and PessimisticLocking

[Brian Stansberry]

https://jira.jboss.org/jira/browse/JBCACHE-1527

Brian Stansberry wrote:
>  From looking at the JBC 3 code, it seems the 
> LockParentForChildInsertRemove configuration is no longer respected for 
> pessimistic locking.  I can't trace any path from the property in 
> Configuration to code that uses it. 
> PessimisticLockInterceptor.handlePutCommand, handleMoveCommand and 
> handleRemoveNodeCommand all always tell the lock manager to lock 
> parents. handleEvictFqnCommand always tells the lock manager not to lock 
> parents.
> 
> This is causing failures in buddy replication testing when nodes 
> join/leave clusters under load. There's a lot of data gravitation plus 
> stuff like migrating defunct backup trees to "DEAD" regions. Too much 
> contention for parent level locks.
> 
> Plus locking on the structural parent to add/remove session nodes will 
> suck for the session caching use case.
> 


-- 
Brian Stansberry
Lead, AS Clustering
JBoss by Red Hat