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The notification system can specify multiple queues to publish to, so each of your dependent services can feed from a separate queue. 

However, this is a critical bug in oslo.messaging that has broken this feature. 
https://bugs.launchpad.net/nova/+bug/1277204

Hopefully it'll get fixed quickly and you'll be able to do what you need.

There were plans for a notification consumer in oslo.messaging, but I don't know where it stands. I'm working on a standalone notification consumer library for rabbit. 

-S

________________________________________
From: Sanchez, Cristian A [cristian.a.sanchez at intel.com]
Sent: Tuesday, February 11, 2014 2:28 PM
To: OpenStack Development Mailing List (not for usage questions)
Subject: [openstack-dev] [oslo-notify] notifications consumed by multiple subscribers

Hi,
I’m planning to use oslo.notify mechanisms to implement a climate blueprint: https://blueprints.launchpad.net/climate/+spec/notifications. Ideally, the notifications sent by climate should be received by multiple services subscribed to the same topic. Is that possible with oslo.notify? And moreover, is there any mechanism for removing items from the queue? Or should one subscriber be responsible for removing items from it?

Thanks

Cristian

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