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[Bug 1286209] Re: unhandled trace if no namespaces in metering agent

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

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https://bugs.launchpad.net/bugs/1286209

Title:
  unhandled trace if no namespaces in metering agent

Status in OpenStack Neutron (virtual network service):
  New
Status in “neutron” package in Ubuntu:
  New

Bug description:
  If network node has no active routers on it l3-agent, metering-agent
  tracing:

  
  2014-02-28 17:04:51.286 1121 DEBUG neutron.services.metering.agents.metering_agent [-] Get router traffic counters _get_traffic_counters /usr/lib/python2.7/dist-packages/neutron/services/metering/agents/metering_agent.py:214
  2014-02-28 17:04:51.286 1121 DEBUG neutron.openstack.common.lockutils [-] Got semaphore "metering-agent" for method "_invoke_driver"... inner /usr/lib/python2.7/dist-packages/neutron/openstack/common/lockutils.py:191
  2014-02-28 17:04:51.286 1121 DEBUG neutron.common.log [-] neutron.services.metering.drivers.iptables.iptables_driver.IptablesMeteringDriver method get_traffic_counters called with arguments (<neutron.context.ContextBase object at 0x2504510>, [{u'status': u'ACTIVE', u'name': u'r', u'gw_port_id': u'86be6088-d967-45a8-bf69-8af76d956a3e', u'admin_state_up': True, u'tenant_id': u'1483a06525a5485e8a7dd64abaa66619', u'_metering_labels': [{u'rules': [{u'remote_ip_prefix': u'0.0.0.0/0', u'direction': u'ingress', u'metering_label_id': u'19de35e4-ea99-4d84-9fbf-7b0c7a390540', u'id': u'3991421b-50ce-46ea-b264-74bb47d09e65', u'excluded': False}, {u'remote_ip_prefix': u'0.0.0.0/0', u'direction': u'egress', u'metering_label_id': u'19de35e4-ea99-4d84-9fbf-7b0c7a390540', u'id': u'706e55db-e2f7-4eb9-940a-67144a075a2c', u'excluded': False}], u'id': u'19de35e4-ea99-4d84-9fbf-7b0c7a390540'}], u'id': u'5ccfe6b8-9c3b-44c4-9580-da0d74ccdcf8'}]) {} wrapper /usr/lib/python2.7/dist-packages/neutron/common/log.py:33
  2014-02-28 17:04:51.286 1121 DEBUG neutron.agent.linux.utils [-] Running command: ['sudo', 'ip', 'netns', 'exec', 'qrouter-5ccfe6b8-9c3b-44c4-9580-da0d74ccdcf8', 'iptables', '-t', 'filter', '-L', 'neutron-meter-l-19de35e4-ea9', '-n', '-v', '-x', '-Z'] execute /usr/lib/python2.7/dist-packages/neutron/agent/linux/utils.py:43
  2014-02-28 17:04:51.291 1121 DEBUG neutron.agent.linux.utils [-]
  Command: ['sudo', 'ip', 'netns', 'exec', 'qrouter-5ccfe6b8-9c3b-44c4-9580-da0d74ccdcf8', 'iptables', '-t', 'filter', '-L', 'neutron-meter-l-19de35e4-ea9', '-n', '-v', '-x', '-Z']
  Exit code: 1
  Stdout: ''
  Stderr: 'Cannot open network namespace: No such file or directory\n' execute /usr/lib/python2.7/dist-packages/neutron/agent/linux/utils.py:60
  2014-02-28 17:04:51.291 1121 ERROR neutron.openstack.common.loopingcall [-] in fixed duration looping call
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall Traceback (most recent call last):
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall   File "/usr/lib/python2.7/dist-packages/neutron/openstack/common/loopingcall.py", line 78, in _inner
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall     self.f(*self.args, **self.kw)
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall   File "/usr/lib/python2.7/dist-packages/neutron/services/metering/agents/metering_agent.py", line 163, in _metering_loop
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall     self._add_metering_infos()
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall   File "/usr/lib/python2.7/dist-packages/neutron/services/metering/agents/metering_agent.py", line 155, in _add_metering_infos
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall     accs = self._get_traffic_counters(self.context, self.routers.values())
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall   File "/usr/lib/python2.7/dist-packages/neutron/services/metering/agents/metering_agent.py", line 215, in _get_traffic_counters
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall     return self._invoke_driver(context, routers, 'get_traffic_counters')
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall   File "/usr/lib/python2.7/dist-packages/neutron/openstack/common/lockutils.py", line 247, in inner
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall     retval = f(*args, **kwargs)
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall   File "/usr/lib/python2.7/dist-packages/neutron/services/metering/agents/metering_agent.py", line 180, in _invoke_driver
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall     {'driver': cfg.CONF.metering_driver,
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall   File "/usr/lib/python2.7/dist-packages/oslo/config/cfg.py", line 1648, in __getattr__
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall     raise NoSuchOptError(name)
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall NoSuchOptError: no such option: metering_driver
  2014-02-28 17:04:51.291 1121 TRACE neutron.openstack.common.loopingcall

  No routers is perfectly fine state for l3-agent, and this should not
  cause errors.

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