Comment 4 for bug 1777591

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Matt Riedemann (mriedem) wrote : Re: ‘limit’ in allocation_candidates where sometimes make fore_hosts invalid

We would have this same problem with rebuild if we need to go through the scheduler again (in case the image changes during rebuild). So yeah we likely need a pre-filter on this, and it was discussed in this spec:

https://specs.openstack.org/openstack/nova-specs/specs/rocky/approved/glance-image-traits.html

See the "Dealing with rebuild" sections.