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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

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

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

** Changed in: nova
     Assignee: Matt Riedemann (mriedem) => Matthew Booth (mbooth-9)

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

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

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

** Changed in: nova/ocata
   Importance: Undecided => High

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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1739323

Title:
  KeyError in host_manager for _get_host_states

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) ocata series:
  Confirmed
Status in OpenStack Compute (nova) pike series:
  Confirmed

Bug description:
  https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L674-L718

  In _get_host_states, a list of all computes nodes is retrieved with a
  `state_key` of `(host, node)`.

  https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L692
  https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L708

  The small piece of code here removes all of the dead compute nodes
  from host_state_map

  https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L708

  However, the result is returned by iterating over all seen nodes and
  using that index for host_state_map, some of which have been deleted
  by the code above, resulting in a KeyError.

  https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L718

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