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

** Changed in: nova
    Milestone: None => liberty-3

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https://bugs.launchpad.net/bugs/1427944

Title:
  instance.host not cleared after reschedule

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  For example, take this scenario:

  1. Assume an environment with a single host… call it host-1
  2. Deploy a VM, but force an exception in the spawn path somewhere to 
simulate some "hypervisor error”
  3. The scheduler correctly attempts to reschedule the VM, and ultimately ends 
up (correctly) with a NoValidHost error because there was only 1 host
  4. However, the instance.host (e.g., [nova show <vm>]) is still showing 
‘host-1’

  After discussion on the mailing list and IRC, we decided this should
  be considered a bug since the instance is no longer tied to the host
  since it blew up in spawn and tried to reschedule.  As such, we should
  clear it out when the claim is aborted.

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