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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Changed in: nova
       Status: New => Confirmed

** Changed in: nova
   Importance: Undecided => Medium

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

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

** Changed in: nova/queens
       Status: New => Confirmed

** Changed in: nova/pike
       Status: New => Confirmed

** Changed in: nova/queens
   Importance: Undecided => Medium

** Changed in: nova/pike
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1750623

Title:
  rebuild to same host with different image shouldn't check with
  placement

Status in OpenStack Compute (nova):
  Confirmed
Status in OpenStack Compute (nova) pike series:
  Confirmed
Status in OpenStack Compute (nova) queens series:
  Confirmed

Bug description:
  When doing a rebuild-to-same-host but with a different image, all we
  really want to do is ensure that the image properties for the new
  image are still valid for the current host.  Accordingly we need to go
  through the scheduler (to run the image-related filters) but we don't
  want to do anything related to resource consumption.

  Currently the scheduler will contact placement to get a pre-filtered
  list of compute nodes with sufficient free resources for the instance
  in question.  If the instance is on a compute node that is close to
  full, this may result in the current compute node being filtered out
  of the list, which will result in a noValidHost exception.

  Ideally, in the case where we are doing a rebuild-to-same-host we
  would simply retrieve the information for the current compute node
  from the DB instead of from placement, and then run the image-related
  scheduler filters.

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