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[Matt Riedemann <mriedem@xxxxxxxxxx>]

The cinder change needs to be reverted also since it's a non-
discoverable API change w/o a microversion. Nova can't rely on this API
until it's in a proper microversion.

** Also affects: cinder
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1538620

Title:
  Attach with host and instance_uuid not backwards compatible

Status in Cinder:
  Confirmed
Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Patch https://review.openstack.org/#/c/266006/ added the ability for
  Cinder to accept both host and instance_uuid when doing an attach.
  This is not backwards compatible to earlier API versions, so when Nova
  calls attach with versions prior to this change with both arguments it
  causes a failure.

  This information is needed for the multiattach work, but we should
  revert that change and try to find a cleaner way to do this that will
  not break backwards compatibility.

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