[jboss-user] [JBoss Messaging] - Re: JBM clients hangs when creating connections/sessions

Daniel Dumitrescu do-not-reply at jboss.com
Tue Jan 10 07:43:35 EST 2012

Daniel Dumitrescu [http://community.jboss.org/people/danezu] created the discussion

"Re: JBM clients hangs when creating connections/sessions"

To view the discussion, visit: http://community.jboss.org/message/645664#645664

Hi again

After getting again the same situation a, I made a thread dump on the server side to see what is happening, and there were two types of blocked threads:
- the JBM's get message count:

"RMI TCP Connection(1910)-" daemon prio=10 tid=0x00007f83f3aa3800 nid=0x1c12 waiting for monitor entry [0x0000000061f66000..0x0000000061f68b20]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at org.jboss.messaging.core.impl.ChannelSupport.getMessageCount(ChannelSupport.java:480)
        - waiting to lock <0x00007f840e9f3048> (a java.lang.Object)
        at org.jboss.messaging.core.impl.PagingChannelSupport.getMessageCount(PagingChannelSupport.java:148)

- the XA commits made from the remote client:

WorkManager(2)-33444" daemon prio=10 tid=0x00007f83e85eb800 nid=0x1aa5 waiting for monitor entry [0x000000005f23a000..0x000000005f23bca0]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at org.jboss.messaging.core.impl.ChannelSupport$InMemoryCallback.afterCommit(ChannelSupport.java:1025)
        - waiting to lock <0x00007f840e9f3048> (a java.lang.Object)
        at org.jboss.messaging.core.impl.tx.Transaction.commit(Transaction.java:228)
        - locked <0x00007f84383f5cd0> (a org.jboss.messaging.core.impl.tx.Transaction)
        at org.jboss.jms.server.endpoint.ServerConnectionEndpoint.sendTransaction(ServerConnectionEndpoint.java:517)

All of the threads seems to be waiting for the same object lock:  <0x00007f840e9f3048>

The blocking threads (like almost 400 of them) lead to unresponsive JMS queue.

It seems that the getMessageCount and afterCommit are waiting for a lock that tryies to synch the situation inside JBM's table with the memory refs.

Doesn anyone knows where I can find this lock, i.e. the concrete type? The following classes seems to use it: ServerConnectionEndpoint, org.jboss.messaging.core.impl.tx.Transaction, org.jboss.messaging.core.impl.ChannelSupport (->PagingChannelSupport -> MessagingQueue)


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