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[LIU Yulong <yulong@xxxxxxxxxxxxx>]

Public bug reported:

If auto_scheduler the router, during race between HA router creating and deleting, the neutron server may treat the HA router as 'no scheduled', then it will create a new HA port binding with the router(id) which is deleted concurrently, and
then foreign key constraint error(Integrity Error) raised.

Exception:
DBReferenceError: (IntegrityError) (1452, 'Cannot add or update a child row: a foreign key constraint fails (`neutron`.`ha_router_agent_port_bindings`, CONSTRAINT `ha_router_agent_port_bindings_ibfk_2` FOREIGN KEY (`router_id`) REFERENCES `routers` (`id`) ON DELETE CASCADE)') 'INSERT INTO ha_router_agent_port_bindings (port_id, router_id, l3_agent_id, state) VALUES (%s, %s, %s, %s)' ('xxxxxxxxxxx', 'xxxxxxxxxxxxxxxxxxx', None, 'standby')

For more information:
https://bugs.launchpad.net/neutron/+bug/1523780/comments/7

** Affects: neutron
     Importance: Undecided
         Status: New

** Summary changed:

- DBReferenceError rasied during race between HA router creating and deleting
+ DBReferenceError rasied during race between HA router deleting and L3 agent sync router info

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https://bugs.launchpad.net/bugs/1533460

Title:
  DBReferenceError rasied during race between HA router deleting and L3
  agent sync router info

Status in neutron:
  New

Bug description:
  If auto_scheduler the router, during race between HA router creating and deleting, the neutron server may treat the HA router as 'no scheduled', then it will create a new HA port binding with the router(id) which is deleted concurrently, and
  then foreign key constraint error(Integrity Error) raised.

  Exception:
  DBReferenceError: (IntegrityError) (1452, 'Cannot add or update a child row: a foreign key constraint fails (`neutron`.`ha_router_agent_port_bindings`, CONSTRAINT `ha_router_agent_port_bindings_ibfk_2` FOREIGN KEY (`router_id`) REFERENCES `routers` (`id`) ON DELETE CASCADE)') 'INSERT INTO ha_router_agent_port_bindings (port_id, router_id, l3_agent_id, state) VALUES (%s, %s, %s, %s)' ('xxxxxxxxxxx', 'xxxxxxxxxxxxxxxxxxx', None, 'standby')

  For more information:
  https://bugs.launchpad.net/neutron/+bug/1523780/comments/7

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