Comment 3 for bug 1804502

as per my comment https://review.openstack.org/#/c/629646/4/nova/scheduler/filters/numa_topology_filter.py@103
we cannont skip valdiating the numa toplogy of a host on rebuild as the image can alter the guest numa toplogy.

if we rebuilt with the same image we skip going back to the schduler so the only time we go to the schduler on rebuild if if the image changed which means we cannot assume there is enough space on the current host.

as presented this bug is invalid however if you can present a way to re validate that the existing numa toplogy is valid with the new image instad of just skiping that may be reasonable.