[openstack-dev] [Heat] Heat Juno Mid-cycle Meetup report

Zane Bitter zbitter at redhat.com
Wed Aug 27 15:41:29 UTC 2014

On 27/08/14 11:04, Steven Hardy wrote:
> On Wed, Aug 27, 2014 at 07:54:41PM +0530, Jyoti Ranjan wrote:
>>     I am little bit skeptical about using Swift for this use case because of
>>     its eventual consistency issue. I am not sure Swift cluster is good to be
>>     used for this kind of problem. Please note that Swift cluster may give you
>>     old data at some point of time.
> This is probably not a major problem, but it's certainly worth considering.
> My assumption is that the latency of making the replicas consistent will be
> small relative to the timeout for things like SoftwareDeployments, so all
> we need is to ensure that instances  eventually get the new data, act on

That part is fine, but if they get the new data and then later get the 
old data back again... that would not be so good.

> it, and send a signal back to Heat (again, Heat eventually getting it via
> Swift will be OK provided the replication delay is small relative to the
> stack timeout, which defaults to one hour)
> Steve
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