[jboss-jira] [JBoss JIRA] Resolved: (JBCACHE-1165) Endless loop in PessimisticLockInterceptor, sometimes seen as a NodeNotExistsException

[Manik Surtani (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBCACHE-1165?page=all ]

Manik Surtani resolved JBCACHE-1165.
------------------------------------

    Resolution: Done

This has been fixed.

The main parts of the fix (all in the pessimistic lock interceptor) involve:

1) Each time a lock is acquired (a call to acquireLock() from within the lock() method) we re-check whether the node we got a lock on is the same node that is in memory (checking object identity) since another thread may have deleted the node in question, and then yet another thread may have recreated a new node object in it's place rendering the lock just acquired invalid.

2) Make sure removeNode calls have createIfNotExists set to true.  Since lock objects exist on the node, acquiring a lock for a remove is meaningless if the node does not exist.


> Endless loop in PessimisticLockInterceptor, sometimes seen as a NodeNotExistsException
> --------------------------------------------------------------------------------------
>
>                 Key: JBCACHE-1165
>                 URL: http://jira.jboss.com/jira/browse/JBCACHE-1165
>             Project: JBoss Cache
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 2.0.0.GA, 1.4.1.SP4
>         Environment: Windows XP, Sun jdk150_06 
> Solaris 10
>            Reporter: Jacek Halat
>         Assigned To: Manik Surtani
>             Fix For: 1.4.1.SP7, 2.1.0.GA
>
>         Attachments: ConcurentPutRemoveTest.java, ConsoleOut.log
>
>
> See ConcurrentPutRemoveTest
> This sometimes manifests itself as an endless loop, and sometimes as a NodeNotExistsException (on the putter thread)  when concurrent puts and removes are involved.

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: http://jira.jboss.com/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira