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[Andrew Laski <andrew@xxxxxxxxxx>]

Public bug reported:

mamandle reported to me on IRC that commit
https://github.com/openstack/nova/commit/f577f650c7ca9d8dd66eaec919e4805c09d16f6d
broke reschedules. Looking at it I see the issue which is that on a
reschedule there is no BuildRequest object in the db so the logic that
checks for that will stop the build attempt from progressing further.
That code is in place to handle the case where a delete happens during
the build process but did not properly account for reschedules.

In the case of a reschedule instance.launched_on will be set so we can
bypass looking for the BuildRequest object in that case. Since the
BuildRequest was deleted during the first scheduling pass it's okay to
do that.

** Affects: nova
     Importance: Critical
     Assignee: Andrew Laski (alaski)
         Status: In Progress


** Tags: newton-rc-potential

** Changed in: nova
   Importance: Undecided => Critical

** Tags added: newton-rc-potential

** Changed in: nova
     Assignee: (unassigned) => Andrew Laski (alaski)

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https://bugs.launchpad.net/bugs/1628530

Title:
  Rescheduling an instance leaves it in a scheduling state and never
  succeeds

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  mamandle reported to me on IRC that commit
  https://github.com/openstack/nova/commit/f577f650c7ca9d8dd66eaec919e4805c09d16f6d
  broke reschedules. Looking at it I see the issue which is that on a
  reschedule there is no BuildRequest object in the db so the logic that
  checks for that will stop the build attempt from progressing further.
  That code is in place to handle the case where a delete happens during
  the build process but did not properly account for reschedules.

  In the case of a reschedule instance.launched_on will be set so we can
  bypass looking for the BuildRequest object in that case. Since the
  BuildRequest was deleted during the first scheduling pass it's okay to
  do that.

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