Open Stack

On Mon, Dec 23, 2013 at 4:57 AM, Jay Pipes <jaypipes at gmail.com> wrote:

> On 12/23/2013 05:42 AM, Thierry Carrez wrote:
>
>> Flavio Percoco wrote:
>>
>>> On 21/12/13 00:41 -0500, Jay Pipes wrote:
>>>
>>>> Cinder is for block storage. Images are just a bunch of blocks, and
>>>> all the store drivers do is take a chunked stream of input blocks and
>>>> store them to disk/swift/s3/rbd/toaster and stream those blocks back
>>>> out again.
>>>>
>>>> So, perhaps the most appropriate place for this is in Cinder-land.
>>>>
>>>
>>> This is an interesting suggestion.
>>>
>>> I wouldn't mind putting it there, although I still prefer it to be
>>> under glance for historical reasons and because Glance team knows that
>>> code.
>>>
>>> How would it work if this lib falls under Block Storage program?
>>>
>>> Should the glance team be added as core contributors of this project?
>>> or Just some of them interested in contributing / reviewing those
>>> patches?
>>>
>>> Thanks for the suggestion. I'd like John and Mark to weigh in too.
>>>
>>
>> Programs are a team of people on a specific mission. If the stores code
>> is maintained by a completely separate group (glance devs), then it
>> doesn't belong in the Block Storage program... unless the Cinder devs
>> intend to adopt it over the long run (and therefore the contributors of
>> the Block Storage program form a happy family rather than two separate
>> groups).
>>
>
> Understood. The reason I offered this up as a suggestion is that currently
> Cinder uses the Glance REST API to store and retrieve volume snapshots, and
> it would be more efficient to just give Cinder the ability to directly
> retrieve the blocks from one of the underlying store drivers (same goes for
> Nova's use of Glance). ...and, since the glance.store drivers are dealing
> with blocks, I thought it made more sense in Cinder.


True, Cinder and Nova should be talking more directly to the underlying
stores--however their direct interface should probably be through
glanceclient. (Glanceclient could evolve to use the glance.store code I
imagine.)

>
>
>  Depending on the exact nature of the "couple of other scenarios where
>> using this code is necessary", I think it would either belong in Glance
>> or in Oslo.
>>
>
> Perhaps something in olso then. oslo.blockstream? oslo.blockstore?
>
>
> Best,
> -jay
>
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