Excerpts from Flavio Percoco's message of 2014-09-18 02:07:09 -0700: > Greetings, > > If I recall correctly, Heat was planning to adopt Zaqar regardless of > the result of the graduation attempt (please correct me if I'm wrong). > Based on this assumption, I'd like to start working on a plan forward to > make this integration happen. > > So far, these are the use cases I've collected from past discussions: > > * Notify heat user before an action is taken, and after - Heat may want > to wait for a response before proceeding - notifications not > necessarily needed and signed read-only queues might help, but not > necessary > * For integrating with user's tools > * Monitoring > * Control surface > * Config management tools > * Does not require notifications and/or read-only/signed queue endpoints > *[These may be helpful, but were not brought up in the discussion]
This is perhaps the most important need. It would be fully satisfied by out of order messages as long as we have guaranteed "at least once" delivery. [for the rest, I've reduced the indent, as I don't think they were meant to be underneath the one above] > * Subscribe to an aggregate feed of interesting events from other > open-stack components (such as Nova) > * Heat is often deployed in a different place than other > components and doesn't have access to the AMQP bus > * Large deployments consist of multiple AMQP brokers, and there > doesn't seem to be a nice way to aggregate all those events [need to > confirm] I've also heard tell that Ceilometer wants to be a sieve for these. I've no idea why that makes sense, but I have heard it said. > * Push metadata updates to os-collect-config agent running in > servers, instead of having them poll Heat This one is fine with an out of order durable queue. > > > Few questions that I think we should start from: > > - Does the above list cover Heat's needs? > - Which of the use cases listed above should be addressed first? > - Can we split the above into milestones w/ due dates? > > > Thanks, > Flavio > _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
