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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

I'm going to mark this as invalid given it's a bug against an in-review
change, so we'll get it fixed in:

https://review.openstack.org/#/c/483566/

** Changed in: nova
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1705446

Title:
  filter scheduler raises TypeError: argument of type 'NoneType' is not
  iterable when placement returns no allocation candidates

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Building on top of the 'claim resources in placement API during
  schedule()' patch series [1] I tried to consume every resources
  available. When the placement API return no allocation candidates as
  there is no resources left the scheduler/manager blows up with a stack
  trace [2].

  It seems that problem is introduces in [3]. The effect is not severe
  as the exception fails the scheduling which is the expected behavior
  when there is no resources left.

  
  [1] https://review.openstack.org/#/c/483566
  [2] http://paste.openstack.org/show/616000/
  [3] https://review.openstack.org/#/c/483565/

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