[openstack-dev] [nova] Is there any reason to exclude originally failed build hosts during live migration?

Sylvain Bauza sbauza at redhat.com
Wed Sep 20 20:29:58 UTC 2017

On Wed, Sep 20, 2017 at 10:15 PM, melanie witt <melwittt at gmail.com> wrote:

> On Wed, 20 Sep 2017 13:47:18 -0500, Matt Riedemann wrote:
>> Presumably there was a good reason why the instance failed to build on a
>> host originally, but that could be for any number of reasons: resource
>> claim failed during a race, configuration issues, etc. Since we don't
>> really know what originally happened, it seems reasonable to not exclude
>> originally attempted build targets since the scheduler filters should still
>> validate them during live migration (this is all assuming you're not using
>> the 'force' flag with live migration - and if you are, all bets are off).
> Yeah, I think because an original failure to build could have been a
> failed claim during a race, config issue, or just been a very long time
> ago, we shouldn't continue to exclude those hosts forever.
> If people agree with doing this fix, then we also have to consider making
>> a similar fix for other move operations like cold migrate, evacuate and
>> unshelve. However, out of those other move operations, only cold migrate
>> attempts any retries. If evacuate or unshelve fail on the target host,
>> there is no retry.
> I agree with doing that fix for all of the move operations.
Yeah, a host could be failing when we created that instance 1 year ago,
that doesn't mean the host won't be available this time.

> -melanie
> __________________________________________________________________________
> OpenStack Development Mailing List (not for usage questions)
> Unsubscribe: OpenStack-dev-request at lists.openstack.org?subject:unsubscribe
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20170920/62162724/attachment.html>

More information about the OpenStack-dev mailing list