<div dir="ltr">Also, while I don't believe there have been any changes to Spring AMQP in this area, I would recommend using the latest version - 1.2.0 (or, at least 1.1.4).</div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Thu, Aug 1, 2013 at 5:46 AM, Emile Joubert <span dir="ltr"><<a href="mailto:emile@rabbitmq.com" target="_blank">emile@rabbitmq.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Hi Lukasz,<br>
<div class="im"><br>
On 31/07/13 17:30, Lukasz Olczak wrote:<br>
> com.rabbitmq.client.ShutdownSignalException: channel error; reason:<br>
> {#method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED -<br>
> unknown delivery tag 1, class-id=60, method-id=80), null, ""}<br>
<br>
<br>
</div>There are legitimate ways in which multiple consumers could get hold of<br>
the same message, in the same second. If any consumer rejects a message<br>
or reconnects then unacknowledged messages will be returned to the<br>
broker and may be delivered to other consumers. Such messages will have<br>
the redelivered flag set.<br>
<br>
The error you quote could also arise if an application acknowledges<br>
messages incorrectly. Make sure that messages are only acknowledged once.<br>
<div class="im"><br>
<br>
> Anybody knows why RabbitMQ duplicates messages on a single broker with a<br>
> publisher and consumers connected through loopback interface?<br>
<br>
<br>
<br>
</div>This is unlikely to have anything to do with the loopback interface<br>
directly. Though loopback offers greater speed which may expose race<br>
conditions.<br>
<br>
If you believe there is a broker error then please run your test via the<br>
Tracer protocol analyser and send us the generated trace file:<br>
<a href="http://www.rabbitmq.com/javadoc/com/rabbitmq/tools/Tracer.html" target="_blank">http://www.rabbitmq.com/javadoc/com/rabbitmq/tools/Tracer.html</a><br>
<br>
<br>
<br>
<br>
<br>
-Emile<br>
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</blockquote></div><br></div>