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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Public bug reported:

If we're using the CachingScheduler and we're not getting alternates,
maybe because conductor is old, we'll get an IndexError because we're
not returning a list of list of selected hosts, we're just returning a
list of selected hosts here:

https://github.com/openstack/nova/blob/f974e3c3566f379211d7fdc790d07b5680925584/nova/scheduler/filter_scheduler.py#L342

And the IndexError would happen here:

https://github.com/openstack/nova/blob/f974e3c3566f379211d7fdc790d07b5680925584/nova/scheduler/filter_scheduler.py#L120

We obviously don't have a test covering this scenario.

** Affects: nova
     Importance: Medium
         Status: Triaged


** Tags: scheduler

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https://bugs.launchpad.net/bugs/1729445

Title:
  Potential IndexError if using the CachingScheduler and not getting
  alternates

Status in OpenStack Compute (nova):
  Triaged

Bug description:
  If we're using the CachingScheduler and we're not getting alternates,
  maybe because conductor is old, we'll get an IndexError because we're
  not returning a list of list of selected hosts, we're just returning a
  list of selected hosts here:

  https://github.com/openstack/nova/blob/f974e3c3566f379211d7fdc790d07b5680925584/nova/scheduler/filter_scheduler.py#L342

  And the IndexError would happen here:

  https://github.com/openstack/nova/blob/f974e3c3566f379211d7fdc790d07b5680925584/nova/scheduler/filter_scheduler.py#L120

  We obviously don't have a test covering this scenario.

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