On 14 October 2016 at 23:55, Jay Pipes <jaypi...@gmail.com> wrote:

> The primary thing that, to me at least, differentiates rolling upgrades of
> distributed software is that different nodes can contain multiple versions
> of the software and continue to communicate with other nodes in the system
> without issue.
> In the case of Glance, you cannot have different versions of the Glance
> service running simultaneously within an environment, because those Glance
> services each directly interface with the Glance database and therefore
> expect the Glance DB schema to look a particular way for a specific version
> of the Glance service software.

Cinder services can run N+-1 versions in a mixed manner, all talking to the
 same database, no conductor required.

Duncan Thomas
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