[openstack-dev] [glance][all] glance_store drivers deprecation/stabilization: Volunteers needed

Flavio Percoco flavio at redhat.com
Mon Jan 11 20:52:11 UTC 2016


Gentle reminder that this is happening next week.


----- Original Message -----
> From: "Flavio Percoco" <flavio at redhat.com>
> To: openstack-dev at lists.openstack.org
> Sent: Thursday, December 10, 2015 9:16:09 AM
> Subject: [glance][all] glance_store drivers deprecation/stabilization: Volunteers needed
> Greetings,
> As some of you know, there's a proposal (still a rough draft) for
> refactoring the glance_store API. This library is the home for the
> store drivers used by Glance to save or access the image data.
> As other drivers in OpenStack, this library is facing the issue of
> having unmaintained, untested and incomplete implementations of stores
> that are, hypotetically, being used in production environments.
> In order to guarantee some level of stability and, more important,
> maintenance, the Glance team is looking for volunteers to sign up as
> maintainers/keepers of the existing drivers.
> Unfortunately, given the fact that our team is not as big as we would
> like and that we don't have the knowledge to provide support for every
> single driver, the Glance team will have to deprecate, and later
> remove, the drivers that will remain without a maintainer.
> Each driver will have to have a voting CI job running (maintained by
> the driver maintainer) that will have to run Glance's functional tests
> to ensure the API features are also supported by the driver.
> There are 2 drivers I belive shouldn't fall into this category and
> that should be maintained by the Glance community itself. These
> drivers are:
> - Filesystem
> - Http
> Please, find the full list of drivers here[0] and feel free to sign up
> as volunteer in as many drivers as your time permits to maintain.
> Please, provide all the information required as the lack of it will
> result in the candidacy not being valid. As some sharp eyes will
> notice, the Swift driver is not in the list above. The reason for that
> is that, although it's a key piece of OpenStack, not everyone in the
> Glance community knows the code of that driver well-enough and there
> are enough folks that know it that could perhaps volunteer as
> maintainers/reviewers for it. Furthermore, adding the swift driver
> there would mean we should probably add the Cinder one as well as it's
> part of OpenStack just like Swift. We can extend that list later. For
> now, I'd like to focus on bringing some stability to the library.
> The above information, as soon as it's complete or the due date is
> reached, will be added to glance_store's docs so that folks know where
> to find the drivers maintainers and who to talk to when things go
> south.
> Here's an attempt to schedule some of this work (please refer to
> this tag[0.1] and this soon-to-be-approved review[0.2] to have more
> info w.r.t the deprecation times and backwards compatibility
> guarantees):
> - By mitaka 2 (Jan 16-22), all drivers should have a maintainer.
>   Drivers without one, will be marked as deprecated in Mitaka.
> - By N-2 (schedule still not available), all drivers that were marked
>   as deprecated in Mitaka will be removed.
> - By N-1 (schedule still not available), all drivers should have
>   support for the main storage capabilities[1], which are READ_ACCESS,
>   WRITE_ACCESS, and DRIVER_REUSABLE. Drivers that won't have support
>   for the main set of capabilities will be marked as deprecated and
>   then removed in O-1 (except for the HTTP one, which the team has
>   agreed on keeping as a read-only driver).
> - By N-2 (schedule still not available), all drivers need to have a
>   voting gate. Drivers that won't have voting gates will be marked as
>   deprecated and then removed in O-1.
> Although glance_store has intermediate releases, the above is being
> planned based on the integrated release to avoid sudden "surprises"
> on already released OpenStack versions.
> Note that the above plan requires that the ongoing effort for setting
> up a gate based on functional tests for glance_store will be
> completed. There's enough time to get all this done for every driver.
> In addition to the above, I'd like to note that we need to do this
> *before* the refactor[2] so that we can provide a minimum guarantee
> that it won't break the existing contract. Furthermore, maintainers of
> this drivers will be asked to help migrating their drivers to the new
> API but that will follow a different schedule that needs to be
> discussed in the spec itself.
> This is, obviously, a multi-release effort that will require syncing
> with future PTLs of the project.
> One more thing. Note that the above work shouldn't distract the team
> from the priorities we've scheduled for Mitaka. The requested
> work/info should be simple enough to provide and work on without
> distracting us. I'll take care of following-up and pinging some folks
> as needed.
> Please, provide your feedback and/or concerns on the above plan,
> Flavio
> [0] https://etherpad.openstack.org/p/glance-store-drivers-status
> [0.1]
> http://governance.openstack.org/reference/tags/assert_follows-standard-deprecation.html
> [0.2] https://review.openstack.org/#/c/226157/
> [1]
> https://github.com/openstack/glance_store/blob/master/glance_store/capabilities.py#L35
> [2] https://review.openstack.org/#/c/188050/
> --
> @flaper87
> Flavio Percoco

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