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[Mohammed Naser <1739323@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: scheduler

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

Title:
  KeyError in host_manager for _get_host_states

Status in OpenStack Compute (nova):
  New

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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