[openstack-dev] [Glance] [all] Liberty summit: Updates in Glance

Flavio Percoco flavio at redhat.com
Mon Jun 1 12:10:35 UTC 2015

On 01/06/15 11:57 +0100, John Garbutt wrote:
>> On 26/05/15 13:54 -0400, Nikhil Komawar wrote:
>>> On 5/26/15 12:57 PM, Jesse Cook wrote:
>>>    We also had some hallway talk about putting the v1 and v2 APIs on top
>>> of
>>>    the v3 API. This forces faster adoption, verifies supportability via v1
>>> and
>>>    v2 tests, increases supportability of v1 and v2 APIs, and pushes out
>>> the
>>>    need to kill v1 API.
>>> Let's discuss more as time and development progresses on that possibility.
>>> v3
>>> API should stay EXPERIMENTAL for now as that would help us understand
>>> use-cases
>>> across programs as it gets adopted by various code-bases. Putting v1/v2 on
>>> top
>>> of v3 would be tricky for now as we may have breaking changes with code
>>> being
>>> relatively-less stable due to narrow review domain.
>> I actually think we'd benefit more from having V2 on top of V3 than
>> not doing it. I'd probably advocate to make this M material rather
>> than L but I think it'd be good.
>> I think regardless of what we do, I'd like to kill v1 as it has a
>> sharing model that is not secure.
>Given v1 has lots of users, killing it will be hard.
>If you maintained v1 support as v1 on top of v3 (or v2 I guess), could
>you not do something like permanently disable the "bad bits" of the

I agree it'll be hard but, at least for v1, I believe it should
happen. It has some security issues (mostly related to image sharing)
that are not going to be fixed there.

>The idea being, users listing their images, and updating image
>metadata via v1, don't get broken during the evolution?

The feedback we got at the summit (even from OPs) was that we could go
ahead, mark it as deprecated, give a deprecation period and then turn
it off.

>FWIW, moving Nova from glance v1 to glance v2, without breaking Nova's
>public API, will require someone getting a big chunk of glance v1 on
>top of glance v2.

AFAIK, the biggest issue right now is "changed-since" which is
something Glance doesn't have in v2 but it's exposed throught Nova's
image API.

I'm happy you brought this up. What are Nova's plans to adopt Glance's
v2 ? I heard there was a discussion and something along the lines of
creating a library that wraps both APIs came up.

Where can I find more info about this?

I really think nova should put some more effort on helping this
happen. The work I did[0] - all red now, I swear it wasn't - during
Kilo didn't get enough attention even before we decided to push it
back. Not a complain, really. However, I'd love to see some
cross-project efforts on making this happen.

[0] https://review.openstack.org/#/c/144875/

Happy to help,

Flavio Percoco
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