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[YAMAMOTO Takashi <yamamoto@xxxxxxxxxxxx>]

Public bug reported:

CallbackFailure related noisy log messages.

eg.


       ERROR [neutron.callbacks.manager] Callback neutron_vpnaas.db.vpn.vpn_db.vpn_callback--9223372036574151638 raised Subnet b3795775-0de9-4c75-bc9a-6f48bd1b2bb7 is used by VPNService a2913f9c-265b-4715-9294-789bb042b71f
       ERROR [root] Original exception being dropped: ['Traceback (most recent call last):\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/src/neutron/neutron/db/l3_db.py", line 892, in _confirm_router_interface_not_in_use\n    events.BEFORE_DELETE, self, **kwargs)\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/src/neutron/neutron/callbacks/registry.py", line 44, in notify\n    _get_callback_manager().notify(resource, event, trigger, **kwargs)\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/src/neutron/neutron/db/api.py", line 179, in wrapped\n    raise db_exc.RetryRequest(e)\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__\n    self.force_reraise()\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise\n    six.reraise(self.type_, self.value, self.tb)\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/src/neutron/neutron/db/api.py", line 174, in wrapped\n    return f(*args, **kwargs)\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/src/neutron/neutron/callbacks/manager.py", line 127, in notify\n    raise exceptions.CallbackFailure(errors=errors)\n', 'CallbackFailure: Callback neutron_vpnaas.db.vpn.vpn_db.vpn_callback--9223372036574151638 failed with "Subnet b3795775-0de9-4c75-bc9a-6f48bd1b2bb7 is used by VPNService a2913f9c-265b-4715-9294-789bb042b71f"\n']

** Affects: neutron
     Importance: Undecided
     Assignee: YAMAMOTO Takashi (yamamoto)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1669244

Title:
  noisy "Original exception being dropped" logs

Status in neutron:
  In Progress

Bug description:
  CallbackFailure related noisy log messages.

  eg.

  
         ERROR [neutron.callbacks.manager] Callback neutron_vpnaas.db.vpn.vpn_db.vpn_callback--9223372036574151638 raised Subnet b3795775-0de9-4c75-bc9a-6f48bd1b2bb7 is used by VPNService a2913f9c-265b-4715-9294-789bb042b71f
         ERROR [root] Original exception being dropped: ['Traceback (most recent call last):\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/src/neutron/neutron/db/l3_db.py", line 892, in _confirm_router_interface_not_in_use\n    events.BEFORE_DELETE, self, **kwargs)\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/src/neutron/neutron/callbacks/registry.py", line 44, in notify\n    _get_callback_manager().notify(resource, event, trigger, **kwargs)\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/src/neutron/neutron/db/api.py", line 179, in wrapped\n    raise db_exc.RetryRequest(e)\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__\n    self.force_reraise()\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise\n    six.reraise(self.type_, self.value, self.tb)\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/src/neutron/neutron/db/api.py", line 174, in wrapped\n    return f(*args, **kwargs)\n', '  File "/Users/yamamoto/git/neutron-vpnaas/.tox/py27/src/neutron/neutron/callbacks/manager.py", line 127, in notify\n    raise exceptions.CallbackFailure(errors=errors)\n', 'CallbackFailure: Callback neutron_vpnaas.db.vpn.vpn_db.vpn_callback--9223372036574151638 failed with "Subnet b3795775-0de9-4c75-bc9a-6f48bd1b2bb7 is used by VPNService a2913f9c-265b-4715-9294-789bb042b71f"\n']

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