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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

You aren't by chance running with some multiple scheduler thread workers
patch are you?

** No longer affects: nova/ocata

** No longer affects: nova/pike

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

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https://bugs.launchpad.net/bugs/1739323

Title:
  KeyError in host_manager for _get_host_states

Status in OpenStack Compute (nova):
  Incomplete

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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