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[Miguel Lavalle <miguel@xxxxxxxxxxxx>]

Public bug reported:

Before deleting a network,
neutron.services.segments.db._delete_segments_for_network callback fails
to delete the network's segments in the case of a routed network. This
is due to the fact that in a routed network, segments are associated to
subnets with a foreign key DB relationship. Therefore, a segment cannot
be deleted before clearing the segment_id attribute in all the related
subnets. Otherwise, the foreign key constraint is violated.

This has been uncovered during work to add segment api tests to the
gate: https://review.openstack.org/#/c/353115/. When the tearDown method
of the tempest test is executed, the following traceback can be seen in
the q-svc screen: http://paste.openstack.org/raw/612268/

** Affects: neutron
     Importance: Medium
     Assignee: Miguel Lavalle (minsel)
         Status: New

** Changed in: neutron
   Importance: Undecided => Medium

** Changed in: neutron
     Assignee: (unassigned) => Miguel Lavalle (minsel)

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https://bugs.launchpad.net/bugs/1697324

Title:
   _delete_segments_for_network callback fails with routed networks

Status in neutron:
  New

Bug description:
  Before deleting a network,
  neutron.services.segments.db._delete_segments_for_network callback
  fails to delete the network's segments in the case of a routed
  network. This is due to the fact that in a routed network, segments
  are associated to subnets with a foreign key DB relationship.
  Therefore, a segment cannot be deleted before clearing the segment_id
  attribute in all the related subnets. Otherwise, the foreign key
  constraint is violated.

  This has been uncovered during work to add segment api tests to the
  gate: https://review.openstack.org/#/c/353115/. When the tearDown
  method of the tempest test is executed, the following traceback can be
  seen in the q-svc screen: http://paste.openstack.org/raw/612268/

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