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

Flavio Percoco flavio at redhat.com
Tue Jan 19 02:28:44 UTC 2016

On 11/01/16 15:52 -0500, Flavio Percoco wrote:
>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.

This has been done!


Only 1 driver was left without maintainer and, as established, I've marked it as


Thanks to everyone who volunteered!

>> - 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

Flavio Percoco
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