Ironic compute node doesn't take over nodes with instance when the owner compute node is down

[Min Sun]

   Description
   ===========
   Ironic compute node doesn't take over nodes with instance when the owner compute node is down

   Steps to reproduce
   ==================
   1. I have two ironic compute nodes & two BM nodes
   2. BM1 is controlled by node1, BM2 is controlled by node2
   3. I boot an instance on BM1
   4. Stop nova-compute service on node1
   5. node2 doesn't take over BM1 although node1 is not available

   Expected result
   ===============
   What I expect is that when node1 id down node2 can take over BM1.

   Actual result
   =============
   node1 doesn't take over BM1.
   And all nova operate action will fail as BM1 has nova compute service on node1 is down

   Environment
   ===========
   openstack-nova-common-14.0.3-9.el7ost.noarch
   openstack-nova-novncproxy-14.0.3-9.el7ost.noarch
   openstack-nova-scheduler-14.0.3-9.el7ost.noarch
   python-novaclient-6.0.0-1.el7ost.noarch
   openstack-nova-conductor-14.0.3-9.el7ost.noarch
   openstack-nova-api-14.0.3-9.el7ost.noarch
   python-nova-14.0.3-9.el7ost.noarch
   openstack-nova-cert-14.0.3-9.el7ost.noarch
   openstack-nova-console-14.0.3-9.el7ost.noarch
   openstack-nova-compute-14.0.3-9.el7ost.noarch
   openstack-nova-common-14.0.3-9.el7ost.noarch

[Min Sun (minsu)]

Anyone meets the same issue here?

[Jim Rollenhagen (jim-rollenhagen)]

This is expected with the current code. See the release note: https://github.com/openstack/nova/blob/master/releasenotes/notes/ironic-driver-hash-ring-7d763d87b9236e5d.yaml#L10-L16

We should make this better, I agree, so we should leave this bug open. But, it's low priority and probably needs a blueprint when we do it.

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Julia Kreger <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/nova/+/813897
Reason: The consensus from the PTG was to refactor the driver to utilize a static mapping. Specifically the introduction of Shard Keys https://review.opendev.org/c/openstack/ironic-specs/+/861803 and their use in the nova.virt.ironic driver https://review.opendev.org/c/openstack/nova-specs/+/862833