I think incremental adoption is a great principle to have and this will enable that.
So +1 -Rob On 3 February 2015 at 13:52, Steve Baker <[email protected]> wrote: > A spec has been raised to add a config option to allow operators to choose > whether to use the new convergence engine for stack operations. For some > context you should read the spec first [1] > > Rather than doing this, I would like to propose the following: > * Users can (optionally) choose which engine to use by specifying an engine > parameter on stack-create (choice of classic or convergence) > * Operators can set a config option which determines which engine to use if > the user makes no explicit choice > * Heat developers will set the default config option from classic to > convergence when convergence is deemed sufficiently mature > > I realize it is not ideal to expose this kind of internal implementation > detail to the user, but choosing convergence _will_ result in different > stack behaviour (such as multiple concurrent update operations) so there is > an argument for giving the user the choice. Given enough supporting > documentation they can choose whether convergence might be worth trying for > a given stack (for example, a large stack which receives frequent updates) > > Operators likely won't feel they have enough knowledge to make the call that > a heat install should be switched to using all convergence, and users will > never be able to try it until the operators do (or the default switches). > > Finally, there are also some benefits to heat developers. Creating a whole > new gate job to test convergence-enabled heat will consume its share of CI > resource. I'm hoping to make it possible for some of our functional tests to > run against a number of scenarios/environments. Being able to run tests > under classic and convergence scenarios in one test run will be a great help > (for performance profiling too). > > If there is enough agreement then I'm fine with taking over and updating the > convergence-config-option spec. > > [1] > https://review.openstack.org/#/c/152301/2/specs/kilo/convergence-config-option.rst > > __________________________________________________________________________ > OpenStack Development Mailing List (not for usage questions) > Unsubscribe: [email protected]?subject:unsubscribe > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev -- Robert Collins <[email protected]> Distinguished Technologist HP Converged Cloud __________________________________________________________________________ OpenStack Development Mailing List (not for usage questions) Unsubscribe: [email protected]?subject:unsubscribe http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
