[openstack-dev] [keystone][nova][neutron][all] Rolling upgrades: database triggers and oslo.versionedobjects

Doug Hellmann doug at doughellmann.com
Fri Sep 2 17:53:19 UTC 2016


Excerpts from Thierry Carrez's message of 2016-09-02 12:15:33 +0200:
> Sean Dague wrote:
> > Putting DB trigger failure analysis into the toolkit required to manage
> > an upgrade failure is a really high bar for new ops.
> 
> I agree with Sean: increasing the variety of technologies used increases
> the system complexity, which in turn requires more skills to fully
> understand and maintain operationally. It should only be done as a last
> resort, with pros and cons carefully weighted. We really should involve
> operators in this discussion to get the full picture of arguments for
> and against.
> 

Yes, I would like to understand better what aspect of the approach
taken elsewhere is leading to the keystone team exploring other
options. So far I'm not seeing much upside to being different, and I'm
hearing a lot of cons.

Doug



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