Open Stack

Wearing my Horizon PTL hat, I'm a huge fan of this entire proposal by the way. It ties very nicely into future plans for Horizon to become an "active listener" on the event notification bus via Oslo's common RPC code, and the more we can drive OpenStack in an event-driven fashion the better!

    - Gabriel

> -----Original Message-----
> From: Sandy Walsh [mailto:sandy.walsh at rackspace.com]
> Sent: Thursday, May 02, 2013 12:17 PM
> To: OpenStack Development Mailing List
> Subject: [openstack-dev] Unified Notifications ...
> 
> Hey y'all!
> 
> At the summit we had a session about unifying the various ways we record
> important events within OpenStack (Nova specifically).
> 
> Currently we have the following approaches:
> 1. The event notification system,
> 2. The InstanceFault DB table,
> 3. The ServerAction DB table
> 4. Exception handling decorators,
> 5. and, to a lesser extent, logging
> 
> With five different ways of doing things not all important events are being
> reported to all channels.
> 
> We did come up with a plan-of-attack. Specifically:
> 
> 1. Drop InstanceFault and roll it into ServerAction 2. Change any logging
> messages greater than DEBUG (like INFO and ERROR) into Notifications.
> 3. Default the Logging Notification Driver to ON, so we don't lose any existing
> functionality. Users can opt to enable the AMQP driver in order to expose
> these notifications to external systems.
> 
> The etherpad is here: https://etherpad.openstack.org/unified-notifications
> 
> Also, by using the notification mechanism we have a route into things like
> Structured Logging (via json) vs the unstructured strings we have today.
> There is also a routing notification driver which permits you to only send
> certain messages to other notification drivers.
> 
> Debug messages would continue to be used as they are today.
> 
> Before we start down this road I just wanted to get a taste of the sentiment
> out there.
> 
> Thanks!
> -S
> 
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