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[Sean Dague <sean@xxxxxxxxx>]

** Changed in: nova/liberty
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1569641

Title:
  server group members are not deleted on failed server create overquota

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) liberty series:
  Fix Released
Status in OpenStack Compute (nova) mitaka series:
  Fix Committed

Bug description:
  When creating instances in the database in the compute API, if we fail
  after creating them we attempt to delete the instances from the DB
  here:

  https://github.com/openstack/nova/blob/af7e83fef3bc2c005c581587e9230a4070f8feb9/nova/compute/api.py#L1033

  However, if there is a failure it's ignored and we continue and just
  re-raise the exception.

  The instances can fail to delete because of a referential constraint
  on the block device mappings created here:

  https://github.com/openstack/nova/blob/af7e83fef3bc2c005c581587e9230a4070f8feb9/nova/compute/api.py#L1471

  So if we don't delete those first, we can't cleanup the instances. You
  can recreate this by changing CONF.quota_server_group_members=0 and
  trying to boot a server into a server group.

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