On May 8, 2013, at 8:20 AM, Charles Richard wrote: > Hi, > > We have a weird issue on our site which some random trigger event will > backup all c3p0 connections until it hits the max pool size. > > I have scripts that will do a softReset on the c3p0 connection pool when > they hit their max so help us manage the issue and to also help me have > time to hopefully get some decent thread dumps to catch the underlying > issue. > > The problem happened yesterday and I get a lot of these: > > "TP-Processor396" daemon prio=10 tid=0x00002aff2ba9d000 nid=0x5a7b waiting > on condition [0x00002aff61e98000] > java.lang.Thread.State: WAITING (parking) > at sun.misc.Unsafe.park(Native Method) > - parking to wait for <0x00002afecfb91da0> (a > java.util.concurrent.Semaphore$NonfairSync) > at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158) > at > java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811) > at > java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:969) > at > java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1281) > at java.util.concurrent.Semaphore.acquire(Semaphore.java:286) > at > com.tc.object.locks.LockStateNode$PendingLockHold.park(LockStateNode.java:179) > at > com.tc.object.locks.ClientLockImpl.acquireQueued(ClientLockImpl.java:723) > at > com.tc.object.locks.ClientLockImpl.acquireQueued(ClientLockImpl.java:701) > at com.tc.object.locks.ClientLockImpl.lock(ClientLockImpl.java:52) > at > com.tc.object.locks.ClientLockManagerImpl.lock(ClientLockManagerImpl.java:98) > at com.tc.object.bytecode.ManagerImpl.lock(ManagerImpl.java:747)
What in your application is using the "com.tc.object.locks" package? This is not used by Tomcat. Dan > > If I look at a stack before the issue happened, I see no TP-Processor > threads with the "parking to wait for". What can i read into this? > > Thanks, > Charles --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
