<p>If you need to have messages delivered in a at least once or exactly once fashion I don't think there is any other way, but if you are ok with loosing messages then looking at the redelivered flag will be much easier.</p>
<div class="gmail_quote">On Jan 19, 2012 5:17 PM, "Iain Hull" <<a href="mailto:iain.hull@workday.com" target="_blank">iain.hull@workday.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
> As far as my experience goes it's correct, you have to implement it at a higher level.<br>
Yes but this is hard when messages are consumed by a cluster, they would have to share a single store to track processed messages or use a local store and ensure that certain messages are only processed by specific hosts in the cluster.<br>
<br>
-----Original Message-----<br>
From: Busoli, Simone [mailto:<a href="mailto:Simone.Busoli@ferrari.com" target="_blank">Simone.Busoli@ferrari.com</a>]<br>
Sent: 19 January 2012 08:50<br>
To: Iain Hull; Eugene Kirpichov<br>
Cc: <a href="mailto:rabbitmq-discuss@lists.rabbitmq.com" target="_blank">rabbitmq-discuss@lists.rabbitmq.com</a><br>
Subject: RE: [rabbitmq-discuss] Acked Message getting redelivered<br>
<br>
As far as my experience goes it's correct, you have to implement it at a higher level.<br>
<br>
-----Original Message-----<br>
From: <a href="mailto:rabbitmq-discuss-bounces@lists.rabbitmq.com" target="_blank">rabbitmq-discuss-bounces@lists.rabbitmq.com</a> [mailto:<a href="mailto:rabbitmq-discuss-bounces@lists.rabbitmq.com" target="_blank">rabbitmq-discuss-bounces@lists.rabbitmq.com</a>] On Behalf Of Iain Hull<br>
Sent: gioved� 19 gennaio 2012 09:46<br>
To: Eugene Kirpichov<br>
Cc: <a href="mailto:rabbitmq-discuss@lists.rabbitmq.com" target="_blank">rabbitmq-discuss@lists.rabbitmq.com</a><br>
Subject: Re: [rabbitmq-discuss] Acked Message getting redelivered<br>
<br>
Thanks Eugene,<br>
<br>
From: Eugene Kirpichov [mailto:<a href="mailto:ekirpichov@gmail.com" target="_blank">ekirpichov@gmail.com</a>]<br>
> Acks are indeed asynchronous.<br>
<br>
So this means that the only reliable way to implement "at most once delivery" is to remember the messages uuids that you have processed, which won't work for clustered consumers. �Is this correct or is there another way to achieve this?<br>
<br>
Regards,<br>
Iain.<br>
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</blockquote></div>