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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => liberty-1

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https://bugs.launchpad.net/bugs/1408859

Title:
  Scheduler didn't release already allocated HostState resources after
  multiple creating instances fails

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  We multiple-create 3 instances, but the host resource is only enough for 1 instance,
  nova-scheduler consume the resource of selected host for the first instance in select_destinations.
  After the multiple creating fails, we try to boot 1 instance with same flavor, the host have
  enough resource to boot it, but nova-scheduler raise 'No Valid Host'. And more worse is that
  host resource tracker only update compute node into DB when the host resource have changed,so ComputeNode's update time in DB will be less than the update time in scheduler cache,the scheduler cache can't be updated. In this case, the host will not be selected forever.
  We need to release the host resource when multiple creating instance is failed.

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