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[Balazs Gibizer <1903545@xxxxxxxxxxxxxxxxxx>]

Fixed by https://review.opendev.org/#/c/738482/ on master

** Also affects: nova/ussuri
   Importance: Undecided
       Status: New

** Also affects: nova/train
   Importance: Undecided
       Status: New

** Also affects: nova/victoria
   Importance: Undecided
       Status: New

** Changed in: nova
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1903545

Title:
  Nova does not support older than N - 1 computes but does not prevent
  such error situation either

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) train series:
  New
Status in OpenStack Compute (nova) ussuri series:
  New
Status in OpenStack Compute (nova) victoria series:
  In Progress

Bug description:
  This bug report is theoretic right now as I don't have actual data for
  a failure scenario. Please add details below if you have one.

  Nova supports rolling upgrade of nova-compute services by keeping the
  compute RPC interface compatible between N and N - 1 (where N is a
  nova major release, like Wallaby). Still nova does not prevent to have
  a deployment with older than N - 1 computes. Some operations will
  still work but some will fail with hard to debug errors, or even leave
  your deployment in an inconsistent state.

  Nova should prevent such inconsistencies.

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