ideas on implementing a priority queue?

[Adam Greene]

hey folks,

RabbitMQ doesn't support the priority flag, as defined by AMQP. Has
anyone tried to work around this with multiple priority queues wrapped
up into a single EM script?

Thanks,
Adam

[Aman Gupta]

This approach should work, but make sure to create separate channels
for each queue you're subscribing to and set the prefetch on the
channels before subscribing.

Aman

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> Adam
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[Joran Kikke]

Have been trying to set this up and got stuck here: http://stackoverflow.com/questions/16938226/high-priority-queue-over-a-lower-one-in-ruby-amqp-with-rabbitmq

[Michael Klishin]

2013/6/6 Joran Kikke <jor...@gmail.com>

Have been trying to set this up and got stuck here: http://stackoverflow.com/questions/16938226/high-priority-queue-over-a-lower-one-in-ruby-amqp-with-rabbitmq

Prefetch does not control which channel has priority for deliveries. It controls how many messages
can be "in progress" (unacknowledged) on it.

This can be used as poor man's prioritization technique, however, you use automatic acknowledgement mode,

so prefetch does not come into play (RabbitMQ immediately considers your messages acknowledged

as soon as it sends them out).

I'd also point out that if you only publish a small number of messages and then your example finishes running,

it is much more likely that the ordering will depend greatly on the order you publish messages in.

To see the effect of the prefetch setting with manual acknowledgements, you'd need to run it for a longer period of time (which depends on your message rates, but say, at least a minute.

--
MK

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