Open Stack

Hey Michael,

Just forwarding this to openstack-dev since I had to go digging for
details when I saw you mention it on twitter. Really nice work!

Full thread here:

http://lists.openstack.org/pipermail/openstack-operators/2013-June/thread.html#3133

Cheers,
Mark.

-------- Forwarded Message --------
> From: Michael Still <mikal at stillhq.com>
> To: Nikola Đipanov <ndipanov at redhat.com>
> Cc: openstack-operators at lists.openstack.org
> <openstack-operators at lists.openstack.org>
> Subject: Re: [Openstack-operators] Slow db migration in havana
> Date: Wed, 12 Jun 2013 18:31:06 +1000
> 
> On Wed, Jun 12, 2013 at 6:32 PM, Nikola Đipanov <ndipanov at redhat.com> wrote:
> > On 12/06/13 00:11, Michael Still wrote:
> 
> >> Perhaps tweaking this migration is ok as long as its functionally
> >> identical -- early deployers just suck up some pain, and later
> >> deployments run a bit faster. Is that possible?
> >
> > I think this is the best option - I will not change the migration
> > functionally - just tweak it's performance (hopefully). I will be
> > posting a patch later today (in CET tz) so you can run it on your
> > dataset and see if there are any significant improvements.
> >
> > I would definitely prefer this over reverting/removing the migration,
> > provided we can make good (or any) performance gains.
> 
> Agreed. For reference, any patchset proposed with a change to a file
> in nova/db/sqlalchemy/migrate_repo/versions will get run through my
> tester automatically. Results are posted to
> http://openstack.stillhq.com/ci/
> 
> The eventual plan is to have this code comment on reviews like
> smokestack or jenkins, but the code is very new so I want to make sure
> its right first.
> 
> However, restating a migration in a patchset probably wont work with
> my test script, as master is applied first. That's something I should
> probably fix in my tester. I'll take a look at that soon.
> 
> Cheers,
> Michael
> 
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