openstack team mailing list archive

[Dan Prince <dprince@xxxxxxxxxx>]

----- Original Message -----
> From: "John Garbutt" <John.Garbutt@xxxxxxxxxx>
> To: "Dan Prince" <dprince@xxxxxxxxxx>, "Vishvananda Ishaya" <vishvananda@xxxxxxxxx>
> Cc: openstack@xxxxxxxxxxxxxxxxxxx
> Sent: Thursday, May 3, 2012 10:56:44 AM
> Subject: RE: [Openstack] database migration cleanup
> 
> I may have missed this in the discussions, but does this impact on
> upgrade?
> 
> I am guessing you have tested Essex -> Folsom upgrade, but does this
> affect people upgrading from any of the Essex milestones to Folsom?

What this does is compact the pre-Essex (final) migrations into a single migration. Users of any of the Essex milestones would need to first upgrade to the final Essex release and then upgrade to Folsom.

This seemed like a reasonable approach since most distributions release updates that contain the final releases anyway.


> I guess the deeper question is which upgrade paths do we want to
> maintain...
> 
> Thanks,
> John
> 
> > -----Original Message-----
> > From:
> > openstack-bounces+john.garbutt=eu.citrix.com@xxxxxxxxxxxxxxxxxxx
> > [mailto:openstack-bounces+john.garbutt=eu.citrix.com@xxxxxxxxxxxxxxxxxxx]
> > On Behalf Of Dan Prince
> > Sent: 02 May 2012 21:20
> > To: Vishvananda Ishaya
> > Cc: openstack@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Openstack] database migration cleanup
> > 
> > 
> > 
> > ----- 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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