[openstack-dev] [Neutron] Implementing new LBaaS API

Kyle Mestery mestery at noironetworks.com
Wed Jun 4 16:54:34 UTC 2014

On Tue, Jun 3, 2014 at 3:01 PM, Brandon Logan
<brandon.logan at rackspace.com> wrote:
> This is an LBaaS topic bud I'd like to get some Neutron Core members to
> give their opinions on this matter so I've just directed this to Neutron
> proper.
> The design for the new API and object model for LBaaS needs to be locked
> down before the hackathon in a couple of weeks and there are some
> questions that need answered.  This is pretty urgent to come on to a
> decision on and to get a clear strategy defined so we can actually do
> real code during the hackathon instead of wasting some of that valuable
> time discussing this.
> Implementation must be backwards compatible
> There are 2 ways that have come up on how to do this:
> 1) New API and object model are created in the same extension and plugin
> as the old.  Any API requests structured for the old API will be
> translated/adapted to the into the new object model.
> -Only one extension and plugin
> -Mostly true backwards compatibility
> -Do not have to rename unchanged resources and models
> -May end up being confusing to an end-user.
> -Separation of old api and new api is less clear
> -Deprecating and removing old api and object model will take a bit more
> work
> -This is basically API versioning the wrong way
> 2) A new extension and plugin are created for the new API and object
> model.  Each API would live side by side.  New API would need to have
> different names for resources and object models from Old API resources
> and object models.
> -Clean demarcation point between old and new
> -No translation layer needed
> -Do not need to modify existing API and object model, no new bugs
> -Drivers do not need to be immediately modified
> -Easy to deprecate and remove old API and object model later
> -Separate extensions and object model will be confusing to end-users
> -Code reuse by copy paste since old extension and plugin will be
> deprecated and removed.
> -This is basically API versioning the wrong way
> Now if #2 is chosen to be feasible and acceptable then there are a
> number of ways to actually do that.  I won't bring those up until a
> clear decision is made on which strategy above is the most acceptable.
Thanks for sending this out Brandon. I'm in favor of option #2 above,
especially considering the long-term plans to remove LBaaS from
Neutron. That approach will help the eventual end goal there. I am
also curious on what others think, and to this end, I've added this as
an agenda item for the team meeting next Monday. Brandon, it would be
great to get you there for the part of the meeting where we'll discuss


> Thanks,
> Brandon
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