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From "Mark Chaimungkalanont (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2798) Occaional hangs on
Date Fri, 25 Jun 2010 06:49:51 GMT
Occaional hangs on 
-------------------

                 Key: AMQ-2798
                 URL: https://issues.apache.org/activemq/browse/AMQ-2798
             Project: ActiveMQ
          Issue Type: Bug
          Components: JMS client
    Affects Versions: 5.3.2
            Reporter: Mark Chaimungkalanont


When connecting to the broker, the client occasionally starts to hang. A thread dump reveals:

{noformat}
"QuartzScheduler_Worker-7" prio=5 tid=0x0116f190 nid=0x1ce2400 waiting on condition [0xf1fae000..0xf1fafb30]
	at sun.misc.Unsafe.park(Native Method)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:118)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1767)
	at java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:341)
	at org.apache.activemq.transport.FutureResponse.getResult(FutureResponse.java:40)
	at org.apache.activemq.transport.ResponseCorrelator.request(ResponseCorrelator.java:80)
	at org.apache.activemq.ActiveMQConnection.syncSendPacket(ActiveMQConnection.java:1233)
	at org.apache.activemq.ActiveMQConnection.ensureConnectionInfoSent(ActiveMQConnection.java:1339)
	- locked <0x10b9bdf8> (a java.lang.Object)
	at org.apache.activemq.ActiveMQConnection.createSession(ActiveMQConnection.java:298)
	at org.jencks.amqpool.SessionPool.createSession(SessionPool.java:110)
	at org.jencks.amqpool.SessionPool.makeObject(SessionPool.java:78)
	at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:974)
	at org.jencks.amqpool.SessionPool.borrowSession(SessionPool.java:53)
	at org.jencks.amqpool.ConnectionPool.createSession(ConnectionPool.java:89)
	at org.jencks.amqpool.XaConnectionPool.createSession(XaConnectionPool.java:51)
	at org.jencks.amqpool.PooledConnection.createSession(PooledConnection.java:132)
	at org.springframework.jms.support.JmsAccessor.createSession(JmsAccessor.java:200)
{noformat}

Looking closer at the code of {{ensureConnectionInfoSent}} in {{ActiveMQConnection}}, it uses
the method:

{code}
public Response syncSendPacket(Command command) throws JMSException {
{code}

which never times out, possibly causing everything to hang eternally. There does seem to be
an identical method that allows for a timeout. 

{code}
    public Response syncSendPacket(Command command, int timeout) throws JMSException {
{code}

should / can ensureConnectionInfoSent use the one with the timeout instead?

We're using the failover transport:
failover:(tcp://<someIP>:54663?wireFormat.maxInactivityDuration=300000)?maxReconnectAttempts=10&amp;initialReconnectDelay=15000

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