[rabbitmq-discuss] Lack of Ack, Failure and Re-delivery

[Bell, Paul M.]

Thank you both.

-Paul

On Jan 21, 2012, at 5:24 PM, "Simone Busoli" <simone.busoli at gmail.com<mailto:simone.busoli at gmail.com>> wrote:


Also in case 2 the broker will redeliver all messages that were not acked, although it doesn't necessarily mean that the consumer didn't really consume them already. For that you should look at the redelivered flag.

On Jan 21, 2012 11:20 PM, "Bell, Paul M." <<mailto:pbell at syncsort.com>pbell at syncsort.com<mailto:pbell at syncsort.com>> wrote:
I apologize. I should have stated up front that the queues and messages are durable.

What happens in case 2, where the consumer bounces?

Thanks, Jason.

-Paul

________________________________________
From: Jason J. W. Williams [<mailto:jasonjwwilliams at gmail.com>jasonjwwilliams at gmail.com<mailto:jasonjwwilliams at gmail.com>]
Sent: Saturday, January 21, 2012 5:05 PM
To: Bell, Paul M.
Cc: <mailto:rabbitmq-discuss at lists.rabbitmq.com> rabbitmq-discuss at lists.rabbitmq.com<mailto:rabbitmq-discuss at lists.rabbitmq.com>
Subject: Re: [rabbitmq-discuss] Lack of Ack, Failure and Re-delivery

Hi Paul,

If the messages were published with the durable flag and the queues are durable, the messages will survive the broker restart and be re-presented to consumers. If the messages or the queues were not durable they will disappear after restart.

-J

Sent via iPhone

Is your email Premiere?

On Jan 21, 2012, at 14:57, "Bell, Paul M." <<mailto:pbell at syncsort.com>pbell at syncsort.com<mailto:pbell at syncsort.com>> wrote:

> Hi,
>
> Suppose I have a producer on NodeP, a broker on NodeB, and a consumer on NodeC. Suppose further that explicit acks are required (i.e., if I've understood the docs, that "noack" is not in effect) and that after consuming a message from the queue, NodeC.consumer dispatches some other work in order to process that message. IOW: NodeC.consumer doesn't respond immediately with an ack.
>
> So, from NodeB.broker's point of view, the message has been moved from the exchange to the queue, consumed, but not yet ack-ed.
>
> What will happen under these two scenarios:
>
> 1. NodeB.broker bounces - when broker restarts what will he do with un-acked messages that have been delivered to queue and haven't been ack-ed; e.g., will these be again delivered to the queue?
>
>
> 2. NodeC.consumer bounces - when consumer restarts is there any way he can again consume the un-acked message, and begin again the work that this message represents? (I suppose that NodeB.broker might be implicated here because it might detect the loss of connection to the NodeC.consumer....).
>
>
> When I say "bounces," I mean at a minimum that the application (broker, consumer) crashed and restarted. But I am also interested in the case where the node's OS is for whatever reason rebooted. Perhaps it looks no different.
>
> Thanks for your help.
>
> -Paul
>
>
>
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