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[Doug Hellmann <doug@xxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1497980

Title:
  DB Exception during rescheduling

Status in neutron:
  Fix Released

Bug description:
  The follwoing trace can be seen on Kilo code during router failover:

   28608 ERROR neutron.db.l3_agentschedulers_db [req-a4af4755-6bf4-4082-bf0f-f5ad12e341ac ] Exception encountered during router rescheduling.
   28608 TRACE neutron.db.l3_agentschedulers_db Traceback (most recent call last):
   28608 TRACE neutron.db.l3_agentschedulers_db File "/usr/lib/python2.7/dist-packages/neutron/db/l3_agentschedulers_db.py", line 121, in reschedule_routers_from_down_agents
   28608 TRACE neutron.db.l3_agentschedulers_db self.reschedule_router(context, binding.router_id)
   28608 TRACE neutron.db.l3_agentschedulers_db File "/usr/lib/python2.7/dist-packages/neutron/db/l3_agentschedulers_db.py", line 263, in reschedule_router
   28608 TRACE neutron.db.l3_agentschedulers_db self._unbind_router(context, router_id, agent['id'])
   28608 TRACE neutron.db.l3_agentschedulers_db File "/usr/lib/python2.7/dist-packages/neutron/db/l3_dvrscheduler_db.py", line 357, in _unbind_router
   28608 TRACE neutron.db.l3_agentschedulers_db self.unbind_snat_servicenode(context, router_id)
   28608 TRACE neutron.db.l3_agentschedulers_db File "/usr/lib/python2.7/dist-packages/neutron/db/l3_dvrscheduler_db.py", line 317, in unbind_snat_servicenode
   28608 TRACE neutron.db.l3_agentschedulers_db binding = self.unbind_snat(context, router_id)
   28608 TRACE neutron.db.l3_agentschedulers_db File "/usr/lib/python2.7/dist-packages/neutron/db/l3_dvrscheduler_db.py", line 265, in unbind_snat
   28608 TRACE neutron.db.l3_agentschedulers_db binding = query.one()
   28608 TRACE neutron.db.l3_agentschedulers_db File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2378, in one
   28608 TRACE neutron.db.l3_agentschedulers_db "Multiple rows were found for one()")
   28608 TRACE neutron.db.l3_agentschedulers_db MultipleResultsFound: Multiple rows were found for one()

  User impact: In case such condition is hit (multiple bindings for snat
  router) rescheduling will always fail, potentially preventing routers
  to failover.

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