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Paul Carver <pcarver at paulcarver.us> wrote:

> On 11/12/2015 3:50 PM, Ihar Hrachyshka wrote:
>> All I am saying is that IF we merge some classifier API into neutron
>> core and start using it for core, non-experimental, features, we cannot
>> later move to some newer version of this API [that you will iterate on]
>> without leaving a huge pile of compatibility code that would not exist
>> in the first place if only we thought about proper API in advance. If
>> that’s what you envision, fine; but I believe it will make adoption of
>> the ‘evolving’ API a lot slower than it could otherwise be.
>
> I don't think I disagree at all. But we don't have a classifier API in  
> neutron core (unless we consider security groups to be it) and I don't  
> think anyone is saying that the classifier in networking-sfc should be  
> merged straight into core as-is. In fact I think we're saying exactly the  
> opposite, that *a* classifier will sit in networking-sfc, outside of core  
> neutron, until *some* classifier is merged into core neutron.
>

That’s why I raised service groups spec in this thread: it seems it’s  
planned to be added into core, with all compatibility guarantees; and was  
planned for adoption for the new fwaas API (as per summit sessions). At  
least I haven’t found anything in their spec that would suggest it’s  
experimental.

It may mean that at the moment when you arrive to some classifier API that  
you can claim the best we can get, there can be a rival classifier API in  
the core tree already.

> The point of networking-sfc isn't the classifier. A classifier is simply  
> a prerequisite. So by all means let's work on defining and merging into  
> core neutron a classifier that we can consider non-experimental and  
> stable for all features to share and depend on, but we don't want SFC to  
> be non-functional while we wait for that to happen. We can call the  
> networking-sfc classifier experimental a slap a warning on that it'll be  
> replaced with the core neutron classifier once such a thing has been  
> implemented.