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[Matt Riedemann <mriedem@xxxxxxxxxx>]

This was mentioned in CERNs blog on upgrading to kilo so marking as
medium and marking for backport to liberty and kilo:

http://openstack-in-production.blogspot.com/

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

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

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

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https://bugs.launchpad.net/bugs/1524421

Title:
  Host Manager reads deleted instance info on startup

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) kilo series:
  In Progress
Status in OpenStack Compute (nova) liberty series:
  In Progress

Bug description:
  In Kilo we added the ability of the HostManager to track information
  about the instances on compute nodes, so that filters that needed this
  information didn't have to constantly make database calls to get it.
  However, the call that is used by HostManager will return deleted
  instance records, which is not useful information and degrades the
  performance. In a large deployment, the overhead of loading the
  records for thousands of deleted instances is causing serious
  performance issues.

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