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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