[rabbitmq-discuss] One message instance in couple of queues

Fri Apr 27 11:37:07 BST 2012

Thanks for that brilliant idea. I didn't know aboud these extensions.

Best regards, Ostin.

27 апреля 2012 г. 13:03 пользователь Steve Powell <steve at rabbitmq.com>написал:

> Ostin,
> It is not clear to me what you are 'watching' these queues for, but if
> you want to retrieve the message from the queues after a certain time,
> then why not investigate Dead Letter Exchanges(DLX) and queue message
> expiry?
>
> If the moderator's private queues have an expiry time (TTL) on them,
> then messages that have been on the queue for that time will be deleted
> -- if there is a DeadLetterExchange associated with the queues, the
> deleted message will be re-published to the new exchange. You can
> arrange for the DLX to route the message to a queue of your choice --
> the monitor process need only listen on this queue.
>
> Be sure to code the moderator carefully (so as not to drop a message
> while moving it) using publisher confirms and acks.
>
> See
> (http://www.rabbitmq.com/extensions.html/#dead-letter-exchanges)
> and
> (http://www.rabbitmq.com/extensions.html/#queue-ttl)
> for more information.
>
> Steve Powell
> steve at rabbitmq.com
> [wrk: +44-2380-111-528] [mob: +44-7815-838-558]
>
> On 21 Apr 2012, at 00:46, Alexey Ostin wrote:
>
> > Let me show one more example.
> >
> > I've got some moderation queue. Whenever a moderator locks message (or
> several messages) for moderation, it moves from main queue to personal
> moderator's queue. Just to perform some long time lock (It can be minute or
> hour, thus I can't use ack/nack to hold message in main queue). The goal is
> to monitor all moderators queues as well as main one. The problem is that I
> do not know all moderator's queues and I can't just monitor some fixed list
> because it regenerates dynamically.
> >
> > I've just thought about using separate exchange for moderator's queues.
> It can help with monitoring, I'd watch over whole exchange.
> > But it is still interesting whether I can publish message to several
> queues and consume it from them all at once. Sounds like gibberish.
> >
> > To be honest I've got one more problem to solve - it is to automatically
> release these locks (put a message from moderator's queue back to main) by
> timeout, but it should be other conversation I think :)
> >
> > Best regards, Ostin.
> >
> > 20 апреля 2012 г. 21:00 пользователь Simon MacMullen <simon at rabbitmq.com>
> написал:
> > On 20/04/12 17:27, ostin wrote:
> > Example application with topic exchange:
> > I push a message to server1.app1 queue and an other one to
> > server1.app2 queue. I monitor server1 queue to determine count of
> > processing messages on server 1. After app1 ends processing message it
> > shold be deleted from both queues: from app1 to prevent duplicate
> > processing, from server1 to have valid stats for monitoring. I assume
> > that there can be many applications with random names, so I cant
> > monitor just count of messages in app* queues.
> >
> > If you want to make sure that a given message is only ever consumed from
> server1.app1 OR server1.app2, why not have only a single queue and have
> both applications consume from it?
> >
> > Cheers, Simon
> >
> > --
> > Simon MacMullen
> > RabbitMQ, VMware
> >
> > _______________________________________________
> > rabbitmq-discuss mailing list
> > rabbitmq-discuss at lists.rabbitmq.com
> > https://lists.rabbitmq.com/cgi-bin/mailman/listinfo/rabbitmq-discuss
>
>
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