[openstack-dev] [Heat] Multi region support for Heat

Randall Burt randall.burt at RACKSPACE.COM
Tue Jul 23 22:03:01 UTC 2013

On Jul 23, 2013, at 11:03 AM, Clint Byrum <clint at fewbar.com>

> Excerpts from Steve Baker's message of 2013-07-22 21:43:05 -0700:
>> On 07/23/2013 10:46 AM, Angus Salkeld wrote:
>>> On 22/07/13 16:52 +0200, Bartosz Górski wrote:
>>>> Hi folks,
>>>> I would like to start a discussion about the blueprint I raised about
>>>> multi region support.
>>>> I would like to get feedback from you. If something is not clear or
>>>> you have questions do not hesitate to ask.
>>>> Please let me know what you think.
>>>> Blueprint:
>>>> https://blueprints.launchpad.net/heat/+spec/multi-region-support
>>>> Wikipage:
>>>> https://wiki.openstack.org/wiki/Heat/Blueprints/Multi_Region_Support_for_Heat
>>> What immediatley looks odd to me is you have a MultiCloud Heat talking
>>> to other Heat's in each region. This seems like unneccessary
>>> complexity to me.
>>> I would have expected one Heat to do this job.
>> It should be possible to achieve this with a single Heat installation -
>> that would make the architecture much simpler.
> Agreed that it would be simpler and is definitely possible.
> However, consider that having a Heat in each region means Heat is more
> resilient to failure. So focusing on a way to make multiple Heat's
> collaborate, rather than on a way to make one Heat talk to two regions
> may be a more productive exercise.

Perhaps, but wouldn't having an engine that only requires the downstream services running (nova, cinder, etc) in a given region be equally if not more resilient? A heat engine in region 1 can still provision resources in region 2 even if the heat service in region 2 is unavailable. Seems that one could handle global availability via any cast, DR strategy or some other routing magic rather than having the engine itself implement some support for it.

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