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Date: Thu, 11 Jun 2015 14:25:02 +0200
Message-ID: 
 <CACsaS95kAw++TccBh8rBc30HkpScWUMT-t00qH3iwHBzkFXEnw@mail.gmail.com>
Subject: Re: How to shutdown ack-flusher thread on Java client?
From: Rob Godfrey <rob.j.godfrey@gmail.com>
To: "users@qpid.apache.org" <users@qpid.apache.org>
Content-Type: text/plain; charset=UTF-8

I've raised a JIRA and made a fix against the AMQP 0-8/9/9-1/10 client
which gets rid of the ack flusher timer:

https://issues.apache.org/jira/browse/QPID-6583

-- Rob

On 11 June 2015 at 11:15, Tomohisa Igarashi <tm.igarashi@gmail.com> wrote:
> Hi Rob,
>
> Thank you for the immediate and clear response!
>
> I agree it doesn't cause a functional problem, just a cleanup issue on
> client shutdown.
> I just found qpid-jms-client and it looks like a successor of the one
> in qpid-client. Are you OK with filing a JIRA for this issue on
> QPIDJMS?
> (I also tried with qpid-jms-client 0.2.0 and same result)
>
> Thanks,
> Tomo
>
>
> --
> IGARASHI Tomohisa    mailto:tm.igarashi@gmail.com
>
>
> On Thu, Jun 11, 2015 at 4:48 PM, Rob Godfrey <rob.j.godfrey@gmail.com> wrote:
>> Hi Tomo,
>>
>> looking at the code (AMQSession_0_10.java), it seems that the
>> ack-flusher is created here (line 75):
>>
>> private static Timer timer = new Timer("ack-flusher", true);
>>
>> That is a single (java.util.)Timer is shared across all sessions on
>> *all* connections - the timer is not connection specific.  Since it is
>> shared by all connections, it is not cancel()led when a connection is
>> close()ed.  The Timer is created with isDaemon being true, so the fact
>> that the thread is never stopped wouldn't normally be an issue.
>>
>> It would need a code change on our side to change this behaviour.
>>
>> -- Rob
>>
>> On 11 June 2015 at 09:30, Tomohisa Igarashi <tm.igarashi@gmail.com> wrote:
>>> Hi,
>>>
>>> When I run Qpid Java client from exec-maven-plugin, I get this warning
>>> complaining about remaining ack-flusher thread:
>>>
>>> ===================
>>> [WARNING] thread
>>> Thread[ack-flusher,5,org.switchyard.quickstarts.camel.amqp.binding.QpidClient]
>>> was interrupted but is still alive after waiting at least 15000msecs
>>> [WARNING] thread
>>> Thread[ack-flusher,5,org.switchyard.quickstarts.camel.amqp.binding.QpidClient]
>>> will linger despite being asked to die via interruption
>>> [WARNING] NOTE: 1 thread(s) did not finish despite being asked to  via
>>> interruption. This is not a problem with exec:java, it is a problem
>>> with the running code. Although not serious, it should be remedied.
>>> [WARNING] Couldn't destroy threadgroup
>>> org.codehaus.mojo.exec.ExecJavaMojo$IsolatedThreadGroup[name=org.switchyard.quickstarts.camel.amqp.binding.QpidClient,maxpri=10]
>>> java.lang.IllegalThreadStateException
>>> ===================
>>>
>>> So ack-flusher thread is not stopped even after connection is closed.
>>> Is there a way to stop it safely?
>>>
>>> Whole client code is here:
>>> https://github.com/igarashitm/switchyard/blob/master/quickstarts/camel-amqp-binding/src/test/java/org/switchyard/quickstarts/camel/amqp/binding/QpidClient.java
>>>
>>> I tried adding connection.close() on this code with qpid-client 0.32,
>>> but I got same warning.
>>>
>>> Thanks,
>>> Tomo
>>>
>>> --
>>> IGARASHI Tomohisa    mailto:tm.igarashi@gmail.com
>>>
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