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From Aleksandar Ivanisevic <>
Subject Re: ActiveMQ Session Task threads disappearing
Date Wed, 14 Sep 2011 12:13:46 GMT
Dom <> 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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