[hibernate-issues] [Hibernate-JIRA] Resolved: (HHH-6296) Unnecessary lock in UpdateTimestampsCache

Unnecessary lock in UpdateTimestampsCache ----------------------------------------- Key: HHH-6296 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6296 Project: Hibernate Core Issue Type: Patch Components: caching (L2) Affects Versions: 3.6.1, 3.6.2, 3.6.3, 3.6.4 Environment: Hibernate 3.6.4 Reporter: Alexandre Thiel Assignee: Gail Badner Priority: Minor Attachments: UpdateTimestampsCache.java.diff Non transactional queries call UpdateTimestmapsCache.invalidate method with an empty array parameter but still acquire a WriteLock which cause a performance bottle neck under heavy load. GNU-Diff Patch for org.hibernate.cache.UpdateTimestampsCache attached Thread dump example : "TP-Processor10" daemon prio=10 tid=0x00000000415cb800 nid=0x6803 waiting on condition [0x00007f1346594000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00007f1370f6d1c0> (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:747) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:778) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1114) at java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock(ReentrantReadWriteLock.java:807) at org.hibernate.cache.UpdateTimestampsCache.invalidate(UpdateTimestampsCache.java:88) at org.hibernate.engine.ActionQueue$AfterTransactionCompletionProcessQueue.afterTransactionCompletion(ActionQueue.java:604) at org.hibernate.engine.ActionQueue.afterTransactionCompletion(ActionQueue.java:209) at org.hibernate.impl.SessionImpl.afterTransactionCompletion(SessionImpl.java:602) at org.hibernate.jdbc.JDBCContext.afterNontransactionalQuery(JDBCContext.java:292) at org.hibernate.impl.SessionImpl.afterOperation(SessionImpl.java:595) at org.hibernate.impl.SessionImpl.load(SessionImpl.java:993) at org.hibernate.impl.SessionImpl.load(SessionImpl.java:978)