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From Adrian Tarau <adrian.ta...@gmail.com>
Subject Re: Transport Exceptions close the connection
Date Tue, 29 May 2007 14:23:08 GMT

Hello James,

I've post this one also as a reply to 
http://www.nabble.com/Re%3A-Message-queue-getting-blocked-tf3335509s2354.html#a10854794
http://www.nabble.com/Re%3A-Message-queue-getting-blocked-tf3335509s2354.html#a10854794 

Cannot test, because the producers block during close. Any thoughts?

Name: SAMS-Worker-queue.contact_type-1
State: WAITING on
edu.emory.mathcs.backport.java.util.concurrent.locks.CondVar@891d76
Total blocked: 10  Total waited: 5

Stack trace: 
java.lang.Object.wait(Native Method)
java.lang.Object.wait(Object.java:474)
edu.emory.mathcs.backport.java.util.concurrent.locks.CondVar.await(CondVar.java:75)
edu.emory.mathcs.backport.java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:318)
org.apache.activemq.transport.FutureResponse.getResult(FutureResponse.java:42)
org.apache.activemq.transport.ResponseCorrelator.request(ResponseCorrelator.java:75)
org.apache.activemq.ActiveMQConnection.syncSendPacket(ActiveMQConnection.java:1175)
org.apache.activemq.ActiveMQSession.syncSendPacket(ActiveMQSession.java:1663)
org.apache.activemq.ActiveMQMessageConsumer.close(ActiveMQMessageConsumer.java:542)
com.daxtechnologies.sams.manager.AbstractSamsManagerQueue.consume(AbstractSamsManagerQueue.java:231)
com.daxtechnologies.sams.manager.SamsManagerQueues$AbstractQueueRunnable.consume(SamsManagerQueues.java:456)
com.daxtechnologies.sams.manager.SamsManagerQueues$AbstractQueueRunnable.throttleQueue(SamsManagerQueues.java:434)
com.daxtechnologies.sams.manager.SamsManagerQueues$AbstractQueueRunnable.run(SamsManagerQueues.java:473)
com.daxtechnologies.sams.manager.SamsManagerThreadPool$WorkerThead.run(SamsManagerThreadPool.java:206)



James.Strachan wrote:
> 
> On 5/21/07, Adrian Tarau <adrian.tarau@gmail.com> wrote:
>>
>> Hello,
>>
>> I have the following problem : A connection(embedded broker, vm
>> transport)
>> is created and then a few sessions. I poll for messages, with my own
>> threads
>> in order to do throttling. One thing that confuses me is : if an
>> exception
>> occurs somewhere in the transport(for example an interrupt on the
>> consuming
>> thread) , the connection is closed with all the sessions and
>> consumers/producers.
> 
> AFAIK thread interupt exceptions won't close a
> connection/session/transport. You sure its not some other underlying
> excpetion?
> 
> 
>> I was able to listen for such an exceptions(with
>> Connection.setExceptionListener(...)) and recreate the connection. I
>> tried
>> also with connectionFactory.setBrokerURL("failover:vm://localhost") which
>> supposed to fix problems like this one, and to reconnect, but is not
>> working
>> as espected.
> 
> When using vm:// you should never really need failover, since the
> broker is in the same JVM. Failover is intended for use with TCP where
> a remote broker may fail.
> 
> Even if you were having a transport level exception (which shouldn't
> really happen with vm:// but maybe there's a bug & we should catch &
> handle InteruptedException better) then failover does the re-creation
> of all the connection/sessions for you so there's no real point trying
> to replicate that yourself (as you'll be opening all kinds of cans of
> worms, like figuring out which messages, transactions &
> acknowledgements were in progress & re-submitting them - all of which
> failover: already handles.
> 
> BTW 4.0.2 is quite old, I'd recommend upgrading to 4.1.1
> -- 
> James
> -------
> http://macstrac.blogspot.com/
> 
> 

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