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From Gary Tully <gary.tu...@gmail.com>
Subject Re: ActiveMQ Session Task threads disappearing
Date Thu, 15 Sep 2011 14:41:19 GMT
set the uncaught handler once in your client jvm, so that it has global effect:
>From your client main, or some startup code, use:
http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Thread.html#setDefaultUncaughtExceptionHandler(java.lang.Thread.UncaughtExceptionHandler)

On 15 September 2011 14:47, Dom <thephenix@gmail.com> wrote:
> I'm hesitant to turn trace logging on as we get thousands of messages per
> second, and this problem occurs maybe weeks apart, maybe days apart and so
> trying to find anything in the log will be hard.
>
> As for the default uncaught exception handler... I cant see how we can set
> that from outside the ActiveMQ library. And our onMessage code is always;
>
> public void onMessage(Message message) {
> try {
> //handling code here
> } catch (Exception e) {
> log.error("Exception parsing message from JMS", e);
> }
> }
>
> From my consumer I've added a line to always set the
> uncaughtExceptionHandler in our onMessage and set to log that.
>
> I've also noticed from one of the JVM's that it's been up for; 5 days
> 23:30:52.042
> and the current active session task is; ActiveMQ Session Task-7296
>
> I'm not sure if that's any help, because from what I understand of the
> thread pool executors,they will unload threads if idle and create more if
> needed.
>
>
> On Thu, Sep 15, 2011 at 12:31 PM, Gary Tully [via ActiveMQ] <
> ml-node+s2283324n3815303h42@n4.nabble.com> wrote:
>
>> Dom,
>> this is unusual, some thoughts:
>> can you enable trace level logging  for activemq on your clients to
>> see if there is anything suspicious in there.
>> If the dispatch thread is dying we should be able to see why.
>> As a catch all, can you specify a
>> java.lang.Thread#setDefaultUncaughtExceptionHandler in your client
>> code, in case some catch is missing.
>>
>> The other thing we could do it check that the dispatch thread is alive
>> on each message receive from the transport, but really we should be
>> getting some indication as to why it dies.
>>
>> On 14 September 2011 15:45, Dom <[hidden email]<http://user/SendEmail.jtp?type=node&node=3815303&i=0>>
>> wrote:
>>
>> > Our subscribers are not durable, however I have noticed that it does
>> appear
>> > to occur around our peaks (sometimes before, sometimes afterwards).
>> Although
>> > I have had it occur once at night, when our traffic was very load (1% of
>> > peak).
>> >
>> > I'm using the OpenWire protocol, not stomp. So I'm guessing that our two
>> > problems may be different. As I said before, I've noticed that the thread
>>
>> > which deals with handing messages from the transport code to
>> > my listeners seems to die, and even killing and restart the consumer
>> doesn't
>> > work (although it does free up the topic for the other consumers). I have
>> to
>> > actively kill the client's JVM and restart it.
>> >
>> > Dom
>> >
>> > On Wed, Sep 14, 2011 at 1:14 PM, Aleksandar Ivanisevic-3 [via ActiveMQ] <
>>
>> > [hidden email] <http://user/SendEmail.jtp?type=node&node=3815303&i=1>>
>> wrote:
>> >
>> >> Dom <[hidden email] <
>> http://user/SendEmail.jtp?type=node&node=3812638&i=0>>
>> >> writes:
>> >>
>> >> > Hi,
>> >> >
>> >> > I've starting having unusual problems with my ActiveMQ consumers, we
>> send
>> >>
>> >> > object messages via JMS 24 hours a day, peaking at around 10k per
>> second
>> >> to
>> >> > various different consumers. All these consumers are consuming from
>> the
>> >> same
>> >> > topic, however from different physical servers. The consumers are all
>> >> based
>> >> > on the same abstract class (from a shared JAR).
>> >> >
>> >> > On our servers running Java 6 build 20 we haven't seen an issue. We
>> have
>> >> > some newer servers running in Java 6 build 26, and these servers some
>> >> times
>> >> > have the issue.
>> >> >
>> >> > The problem is; Some of the consumers will randomly simply stop
>> consuming
>> >> -
>> >> > still be sent messages from ActiveMQ, just stop passing them into our
>> >> code
>> >> > base. After a while this causes all consumers on that topic to stop
>> >> > receiving messages (once our buffer on ActiveMQ fills up).
>> >>
>> >> Are you using durable subscribers? Have you seen redeliveries around
>> >> the time it stops? I'm having a similar issue where a consumer just
>> >> stops receiving messages from a durable topic, usually after a period
>> >> of peak traffic and after a redelivery. After a while this causes the
>> >> complete topic to "block". Consumers are subscribed to multiple topics
>> >> and only one topic is dead, the rest continue to work normally until a
>> >> consumer is restarted.
>> >>
>> >> Out of desperation I've upgraded the broker to a 5.6 snapshot, and now
>> >> I see this issue a lot less, but still see it once a week on
>> >> average. Haven't been able to tie it to java version, was happening
>> >> with build 20 and now with 23. Consumers are not java at all, they are
>> >> in perl and use STOMP to communicate.
>> >>
>> >>
>> >> [...]
>> >>
>> >>
>> >> --
>> >> Ti si arogantan, prepotentan i peglaš vlastitu frustraciju. -- Ivan
>> >> Tišljar, hr.comp.os.linux
>> >>
>> >>
>> >>
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>> >>
>> >>
>> >
>> >
>> > --
>> > View this message in context:
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>>
>>
>>
>> --
>> http://fusesource.com
>> http://blog.garytully.com
>>
>>
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>
>
> --
> View this message in context: http://activemq.2283324.n4.nabble.com/ActiveMQ-Session-Task-threads-disappearing-tp3810649p3815617.html
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