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Based on the docs, it looks like you need to start with separate sqlalchemy
engines with their own metadata instances for each environment you want to
migrate. That sounds like a significant refactor from where we are today
(everything shares keystone.common.sql.core.ModelBase).


On Thu, Jul 25, 2013 at 10:41 PM, Morgan Fainberg <m at metacloud.com> wrote:

> +1 to getting the multiple repos in place.  Moving to Alembric later on in
> H or even as the first commit of I should meet our goals to be on Alembric
> in a reasonable timeframe.  This also allows us to ensure we aren't rushing
> the work to get our migration repos over to Alembric.
>
> I think that allowing the extensions to have their own repos sooner is
> better, and if we end up with an extension that has more than 1 or 2
> migrations, we have probably accepted code that is far from fully baked
> (and we should evaluate how that code made it in).
>
> I am personally in favor of making the first commit of Icehouse (barring
> any major issue) the point in which we move to Alembric.  We can be
> selective in taking extension modifications that add migration repos if it
> is a major concern that moving to Alembric is going to be really painful.
>
> Cheers,
> Morgan Fainberg
>
> On Thu, Jul 25, 2013 at 7:35 PM, Adam Young <ayoung at redhat.com> wrote:
>
>> I've been looking into Alembic support.  It seems that there is one thing
>> missing that I was counting on:  multiple migration repos. It might be
>> supported, but the docs are thin, and reports vary.
>>
>> In the current Keystone implementation, we have a table like this:
>> mysql> desc migrate_version;
>> +-----------------+-----------**---+------+-----+---------+---**----+
>> | Field           | Type         | Null | Key | Default | Extra |
>> +-----------------+-----------**---+------+-----+---------+---**----+
>> | repository_id   | varchar(250) | NO   | PRI | NULL    |       |
>> | repository_path | text         | YES  |     | NULL    |       |
>> | version         | int(11)      | YES  |     | NULL    |       |
>> +-----------------+-----------**---+------+-----+---------+---**----+
>>
>>
>> Right now we only have one row in there:
>>
>>  keystone      | /opt/stack/keystone/keystone/**common/sql/migrate_repo
>> |       0
>>
>>
>> However, we have been lumping all of our migrations together into a
>> singel repo, and we are just now looking to sort them out.  For example,
>> Policy, Tokens, and Identity do not really need to share a database.  As
>> such, they could go into separate migration repos, and it would keep
>> changes to one from stepping on changes to another, and avoiding the
>> continuous rebasing problem we currently have.
>>
>> In addition, we want to put each of the extensions into their own repos.
>>  This happens to be an important time for that, as we have three extensions
>> coming in that need SQL repos:  OAuth, KDS, and Attribute Mapping.
>>
>> I think we should delay moving Keystone to Alembic until the end of
>> Havana, or as the first commit in Icehouse.  That way, we have a clean cut
>> over point. We can decide then whether to backport the Extnesion migrations
>> or leave them under sql_alchemy migrations. Mixing the two technologies
>> side by side for a short period of time is going to be required, and I
>> think we need to have a clear approach in place to avoid a mess.
>>
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>
>
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-- 

-Dolph
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