>Flag is only for admin use, tenant can't see it, and the default policy
for router is setup by config file.

It's still a public API that will have to follow a deprecation cycle. If a
new API was going to be introduced for admins to control the distributed
nature of routers, it would have been nice to introduce a little more
control than distributed=True/False (e.g. how many SNAT IPs are consumed,
etc). At this point we are stuck because any new API entries would require
a blueprint and the feature proposal freeze deadline is long gone.

>It COULD be compatible for DVR work on vlan, but there were some bugs
several months before, that DVR mac are not written successfully on the
egress packet, I'm not sure if it is fixed in the merged code.

The current DVR wiki[1] still shows that the tenant_network_type has to be
VXLAN. I didn't know about this issue until just recently and I'm not sure
if there are plans yet to fix it for Juno. If it were in an incubation tree
somewhere and not on Gerrit for the majority of the cycle, the bug could
have been worked on in parallel by other volunteers interested in VLAN
support. Now that DVR is solidifying, VLAN support may even require a
blueprint unless it's blessed by the right cores, which would mean people
with VLAN deployments would not be able to use DVR until Kilo is released
next next May.

The whole point is that there is nowhere to work on big features like this
in a fast, iterative, and open manner. The incubator could be a perfect
place for this type of work.


1. https://wiki.openstack.org/wiki/Neutron/DVR/HowTo


On Wed, Aug 27, 2014 at 1:22 AM, loy wolfe <loywo...@gmail.com> wrote:

>
>
>
> On Wed, Aug 27, 2014 at 2:44 PM, Kevin Benton <blak...@gmail.com> wrote:
>
>> >Incubator doesn't mean being kicked out of tree, it just mean that the
>> API and resource model needs to be baked for fast iteration, and can't be
>> put in tree temporarily.
>>
>> That was exactly my point about developing a major feature like DVR. Even
>> with a limited API change (the new distributed flag), it has an impact on
>> the the router/agent DB resource model and currently isn't compatible
>> with VLAN based ML2 deployments. It's not exactly a hidden optimization
>> like an improvement to some RPC handling code.
>>
>>
> Flag is only for admin use, tenant can't see it, and the default policy
> for router is setup by config file.
>
> It COULD be compatible for DVR work on vlan, but there were some bugs
> several months before, that DVR mac are not written successfully on the
> egress packet, I'm not sure if it is fixed in the merged code.
>
>
>> A huge piece of the DVR development had to happen in Neutron forks and
>> 40+ revision chains of Gerrit patches. It was very difficult to follow
>> without being heavily involved with the L3 team. This would have been a
>> great candidate to develop in the incubator if it existed at the time. It
>> would have been easier to try as it was developed and to explore the entire
>> codebase. Also, more people could have been contributing bug fixes and
>> improvements since an entire section of code wouldn't be 'owned' by one
>> person like it is with the author of a Gerrit review.
>>
>> >For DVR, as it has no influence on tenant facing API resource model, it
>> works as the built-in backend, and this feature has accepted wide common
>> interests,
>>
>> As was pointed out before, common interest has nothing to do with
>> incubation. Incubation is to rapidly iterate on a new feature for Neutron.
>> It shouldn't be restricted to API changes, it should be used for any major
>> new features that are possible to develop outside of the Neutron core. If
>> we are going to have this new incubator tool, we should use it to the
>> fullest extent possible.
>>
>
>>
>> On Tue, Aug 26, 2014 at 6:19 PM, loy wolfe <loywo...@gmail.com> wrote:
>>
>>> Incubator doesn't mean being kicked out of tree, it just mean that the
>>> API and resource model needs to be baked for fast iteration, and can't be
>>> put in tree temporarily. As kyle has said, incubator is not talking about
>>> moving 3rd drivers out of tree, which is in another thread.
>>>
>>> For DVR, as it has no influence on tenant facing API resource model, it
>>> works as the built-in backend, and this feature has accepted wide common
>>> interests, it's just the internal performance optimization tightly coupled
>>> with existing code, so it should be developed in tree.
>>>
>>>
>>> On Wed, Aug 27, 2014 at 8:08 AM, Kevin Benton <blak...@gmail.com> wrote:
>>>
>>>> From what I understand, the intended projects for the incubator can't
>>>> operate without neutron because they are just extensions/plugins/drivers.
>>>>
>>>> For example, if the DVR modifications to the reference reference L3
>>>> plugin weren't already being developed in the tree, DVR could have been
>>>> developed in the incubator and then merged into Neutron once the bugs were
>>>> ironed out so a huge string of Gerrit patches didn't need to be tracked. If
>>>> that had happened, would it make sense to keep the L3 plugin as a
>>>> completely separate project or merge it? I understand this is the approach
>>>> the load balancer folks took by making Octavia a separate project, but I
>>>> think it can still operate on its own, where the reference L3 plugin (and
>>>> many of the other incubator projects) are just classes that expect to be
>>>> able to make core Neutron calls.
>>>>
>>>> _______________________________________________
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>>>> OpenStack-dev@lists.openstack.org
>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>>>>
>>>>
>>>
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>>>
>>
>>
>> --
>> Kevin Benton
>>
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-- 
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