Why do the number of active JMS connections increase?
<strong>Problem</strong>
- Number of active JMS connections and current JMS messages increases until the Weblogic instances crash with an OutOfMemory exception
<strong>Setup</strong>
- Weblogic v9.2.3, Cluster with 4 Nodes
- A JMS Message is sent from a MDB in Weblogic to a distributed queue which has a member on each of the 4 Weblogic nodes. The session is created as follows session = connection.createSession(false,Session.AUTO_ACKNOWLEDGE), the message delivery mode is set programmatically to persistent and the delivery mode override of the queue setup is set to persistent too
- Standalone JMS client processes: each one is attached to <strong>all</strong> 4 nodes. Each one uses a unique JMS message selector so that we have more than one queue consumer for one queue but every message is exactly dedicated to one queue consumer. We us weblogic.jar for the clients.
- Use of Weblogic auto reconnect feature. JMS client code:
Connection connection = this.connectionFactory.createQueueConnection();
final WLConnection wlconnection = (WLConnection)connection;
wlconnection.setReconnectPolicy(JMSConstants.RECONNECT_POLICY_ALL);
wlconnection.setTotalReconnectPeriodMillis(-1);
wlconnection.setReconnectBlockingMillis(-1);
<strong>Remarks and Questions</strong>
- There are no pending JMS messages which is good
- In our setup, each JMS client is connected to all 4 nodes as the messages are not distributed to all nodes: if a message is put to Queue A but the client is only connected to Queue B, the message is NOT transfered from Queue A to Queue B. We set the parameter "Forward Delay" to 5 seconds with no effects. Is this the normal behavior?
- Not all JMS clients are visible in the Weblogic console under JMS Services -> JMS Servers -> [Server] -> Monitoring -> Active Connections. Which one are visible? Which one are not visible? There are also clients where the number of connections is not zero but stays constant; we know that as several independent clients on different hosts are started and the IP adress is visible in the Weblogic console. Why....?
- What reasons can lead to increasing connections? Is this due to client or server problems? Do we have to acknowledge the message in the onMessage(Message) method of the client JMS consumer? So far as I know, we don't have to.
- Are the increasing number of current messages due to the increasing number of JMS connections?
- May the RECONNECT_POLICY_ALL policy produce this problem?
Any hint is appreciated.
Peter
Edited by: pkeller on 23.10.2008 17:08
To answer the question about the forwarding of messages from one queue to another myself: As mentioned at http://forums.bea.com/thread.jspa?threadID=400000611, the forwarding for queues does only work if all queue consumers are attached to the same queue. This means that our setup is OK.
But the main question is still unanswered: why do the number of active JMS connections increase? I forgot to mention that
- all messages arrive at the clients and that no exceptions are visible in the log
- if you kill the client, the connections are still visible in the Weblogic console!?
Please help as this problem is very urgent.
Peter
Edited by: pkeller on 24.10.2008 09:06
Edited by: pkeller on 24.10.2008 09:10
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