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[Dan Prince <dprince@xxxxxxxxxx>]

----- Original Message -----
> From: "Vishvananda Ishaya" <vishvananda@xxxxxxxxx>
> To: "Dan Prince" <dprince@xxxxxxxxxx>
> Cc: openstack@xxxxxxxxxxxxxxxxxxx
> Sent: Thursday, April 26, 2012 4:14:25 PM
> Subject: Re: [Openstack] database migration cleanup
> 
> +1.  Might be nice to have some kind of test to verify that the new
> migration leaves the tables in exactly the same state as the old
> migrations.

Hey Vish,

This is an outline of what I did to test MySQL and PostgreSQL to ensure the compact migration script generates *exactly* the same schemas as before:

http://wiki.openstack.org/database_migration_testing

As things stand both MySQL and PostgreSQL are exactly the same. I have some pending changes that I've found in the schemas that need to be fixed in Folsom... but the goal here was to replicate Essex with migration 082 so that is what I did.

Sqlite has a few differences (indexes for example). How important is it that the Sqlite schema be exactly the same? Unit tests are passing.

Dan


> 
> Vish
> 
> On Apr 26, 2012, at 12:24 PM, Dan Prince wrote:
> 
> > The OpenStack Essex release had 82 database migrations. As these
> > grow in number it seems reasonable to clean house from time to
> > time. Now seems as good a time as any.
> > 
> > I came up with a first go at it here:
> > 
> > https://review.openstack.org/#/c/6847/
> > 
> > The idea is that we would:
> > 
> > * Do this early in the release cycle to minimize risk.
> > 
> > * Compact all pre-Folsom migrations into a single migration. This
> > migration would be used for new installations.
> > 
> > * New migrations during the Folsom release cycle would proceed as
> > normal.
> > 
> > * Migrations added during Folsom release cycle could be compacted
> > during "E" release cycle. TBD if/when we do the next compaction.
> > 
> > * Users upgrading from pre-Essex would need to upgrade to Essex
> > first. Then Folsom.
> > 
> > --
> > 
> > I think this scheme would support users who follow stable releases
> > as well as users who follow trunk very closely.
> > 
> > We talked about this at the conference but I thought this issue
> > might be near and dear to some of our end users so it was worth
> > discussing on the list.
> > 
> > What are general thoughts on this approach?
> > 
> > Dan (dprince)
> > 
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