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

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

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

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https://bugs.launchpad.net/bugs/1301696

Title:
  automatic confirm resize should not set migration to error when
  encounter problem

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  function in compute/manager.py _poll_unconfirmed_resizes will translate the migrate status from finished to error 
  whenever it find a problem , consider following case

  1) _poll_unconfirmed_resizes running, it found several migrations to be confirmed
  2) user want to delete an instance ,its task state will be changed to DELETING by 
  3) _poll_unconfirmed_resized will found the task state is not None, it will make the migration error status
  4) following code in _delete
  if instance.vm_state == vm_states.RESIZED:
                  self._confirm_resize_on_deleting(context, instance)
  will fail because migration status already updated

  so we should not set the migration status to 'error' , let it be and
  report warning message is enough

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