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[Terry Wilson <1741889@xxxxxxxxxxxxxxxxxx>]

** Also affects: ovsdbapp
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1741889

Title:
  functional: DbAddCommand sometimes times out after 10 seconds

Status in neutron:
  New
Status in ovsdbapp:
  New

Bug description:
  Traceback (most recent call last):
    File "/opt/stack/new/neutron/.tox/dsvm-functional/local/lib/python2.7/site-packages/fixtures/fixture.py", line 197, in setUp
      self._setUp()
    File "neutron/tests/common/net_helpers.py", line 721, in _setUp
      self.bridge = common_base.create_resource(self.prefix, ovs.add_bridge)
    File "neutron/tests/common/base.py", line 47, in create_resource
      return creation_func(name, *args, **kwargs)
    File "neutron/agent/common/ovs_lib.py", line 140, in add_bridge
      br.create()
    File "neutron/agent/common/ovs_lib.py", line 255, in create
      FAILMODE_SECURE))
    File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
      self.gen.next()
    File "/opt/stack/new/neutron/.tox/dsvm-functional/local/lib/python2.7/site-packages/ovsdbapp/api.py", line 94, in transaction
      self._nested_txn = None
    File "/opt/stack/new/neutron/.tox/dsvm-functional/local/lib/python2.7/site-packages/ovsdbapp/api.py", line 54, in __exit__
      self.result = self.commit()
    File "/opt/stack/new/neutron/.tox/dsvm-functional/local/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py", line 57, in commit
      timeout=self.timeout)
  ovsdbapp.exceptions.TimeoutException: Commands [<ovsdbapp.schema.open_vswitch.commands.AddBridgeCommand object at 0x7fdcc274a9d0>, <ovsdbapp.schema.open_vswitch.commands.DbAddCommand object at 0x7fdcc274aad0>] exceeded timeout 10 seconds

  
  logstash query: http://logstash.openstack.org/#dashboard/file/logstash.json?query=build_name%3A%5C%22legacy-neutron-dsvm-functional%5C%22%20AND%20message%3A%5C%22ovsdbapp.exceptions.TimeoutException%3A%20Commands%5C%22%20AND%20tags%3Aconsole%20AND%20build_status%3AFAILURE

  
  In the logs we can see AddBridgeCommand result returning TRY_AGAIN over and over again:
  http://logs.openstack.org/70/531070/4/check/legacy-neutron-dsvm-functional/9aa7107/logs/dsvm-functional-logs/neutron.tests.functional.agent.test_dhcp_agent.DHCPAgentOVSTestCase.test_agent_mtu_set_on_interface_driver.txt.gz#_2018-01-08_04_20_06_754

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