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From "Reid Morrison (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-3358) ActiveMQ JMXConnectorFactory is not calling close causing thousands of threads to be created
Date Mon, 06 Jun 2011 14:34:58 GMT
ActiveMQ JMXConnectorFactory is not calling close causing thousands of threads to be created
--------------------------------------------------------------------------------------------

                 Key: AMQ-3358
                 URL: https://issues.apache.org/jira/browse/AMQ-3358
             Project: ActiveMQ
          Issue Type: Bug
          Components: JMX
    Affects Versions: 5.5.0
         Environment: Occurs on RHEL 5 and Mac OS
            Reporter: Reid Morrison


We have run into a problem in production where our ActiveMQ 5.5 Broker eventually uses thousands
of threads. Doing a thread stack dump we have thousands of the following entries:

"JMX server connection timeout 127937" daemon prio=10 tid=0x000000001c215000 nid=0x1734 in
Object.wait() [0x00002aabd7c97000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        at com.sun.jmx.remote.internal.ServerCommunicatorAdmin$Timeout.run(ServerCommunicatorAdmin.java:150)
        - locked <0x00002b74ffe91938> (a [I)
        at java.lang.Thread.run(Thread.java:619)

We are using Hyperic HQ to monitor ActiveMQ remotely over JMX.

To reproduce the problem in a stand-alone environment (without needing Hyperic) :
1. Start ActiveMQ 5.5 Broker
2. Connect to ActiveMQ using JConsole and then disconnect
3. Force a thread dump on the ActiveMQ broker process as follows:
   kill -QUIT <activemq-pid>
4. After every JConsole connection to the Broker process the following additional thread is
created:
"JMX server connection timeout 128" daemon prio=5 tid=1030bd000 nid=0x1108f8000 in Object.wait()
[1108f7000]

Under ActiveMQ 5.4.2-Fuse-03-09 we do not see this issue. Is there an existing patch somewhere
that has just not been applied to 5.5?

Someone else with the same issue:
http://web.archiveorange.com/archive/v/hXOgqMGA78WNhT5lpmKX

We found more info on closing the JMX connection:
http://forums.oracle.com/forums/thread.jspa?threadID=1665966&tstart=0

We are willing to make and submit a patch with a little guidance on where we should call the
close() on JMXConnectorFactory.
It appears the source file where the change should be made is:
activemq-core/src/main/java/org/apache/activemq/broker/jmx/ManagementContext.java

Any help is appreciated.

Thank you,
Reid

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