Ok, I found the deadlock scenario....Trying to figure out the fix. For now, set the <overager-period> to 0 to turn off the overager thread.
Bill > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Andrew May > Sent: Thursday, July 17, 2003 9:32 AM > To: [EMAIL PROTECTED] > Subject: [JBoss-user] AbstractInstanceCache deadlock > > > Hi, > > We've just release a production service using JBoss 3.2.1 on > Solaris with Sun's 1.4.2 JVM, > and we're seeing a deadlock on the AbstractInstanceCache for one > of our stateful session > beans that's used heavily. > > Over a period of time more and more threads become locked trying > to insert or get from the > cache, until all the Jetty threads (currently set to a maximum of > 255 on the AJP13 > listener we're using) are locked and the entire site becomes > unresponsive. This seems to > be happening about once an hour. > > I've attached a portion of the thread dump from the server when > it has become unresponsive. > It shows one thread running > org.jboss.ejb.plugins.LRUEnterpriseContextCachePolicy$OveragerTask > .run with a lock > passivating from the AbstractInstanceCache and then a lock and wait on a > org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock. Another > thread is trying to get from > the cache, and one is inserting into the cache. In the entire > thread dump there are more > inserts than gets. > > Because we are using mod_jk and the AJP13 listener we are able to > use the HTTP listener to > view the jmx-console after the site has become unresponsive, but > I'm not sure what to look > for. > > We're going to download the source and start looking at the cache > implementation, but we > would appreciate any help or advice, as we need to fix this urgently. > > Regards, > > Andrew > ------------------------------------------------------- This SF.net email is sponsored by: VM Ware With VMware you can run multiple operating systems on a single machine. WITHOUT REBOOTING! Mix Linux / Windows / Novell virtual machines at the same time. Free trial click here: http://www.vmware.com/wl/offer/345/0 _______________________________________________ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
