[openstack-dev] blueprint amqp-rpc-fast-reply-queue
eric at cloudscaling.com
Tue Jan 29 23:32:00 UTC 2013
> Probably the best reason is the existing change can do all the things you mentioned:
> "Grizzly will be able to send and reply and get replies from Havana, regardless of if Grizzly is set to compatibility mode or not"
> This can be accomplished by retaining in Havana the code that recognizes the old message content and replies in the old way if found.
> "Grizzly would also, by default, be able to send and reply to Folsom, as well as receive replies from Folsom as long as compatibility mode is not disabled."
Yes, it can do both, but not at the same time. Without listening on two queues, the code does one-or-the-other, but not both. The code is either forwards OR backwards compatible. It would be much easier for migrations if it can be both.
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