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[Doug Hellmann <doug@xxxxxxxxxxxxxxxx>]

** Changed in: oslo.messaging
       Status: Fix Committed => Fix Released

** Changed in: oslo.messaging
    Milestone: None => 1.6.0

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https://bugs.launchpad.net/bugs/1318721

Title:
  RPC timeout in all neutron agents

Status in OpenStack Neutron (virtual network service):
  Invalid
Status in Messaging API for OpenStack:
  Fix Released

Bug description:
  In the logs the first traceback that happen is this:

  [-] Unexpected exception occurred 1 time(s)... retrying.
  Traceback (most recent call last):
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/neutron/openstack/common/excutils.py", line 62, in inner_func
      return infunc(*args, **kwargs)
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/neutron/openstack/common/rpc/impl_kombu.py", line 741, in _consumer_thread
       
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/neutron/openstack/common/rpc/impl_kombu.py", line 732, in consume
      @excutils.forever_retry_uncaught_exceptions
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/neutron/openstack/common/rpc/impl_kombu.py", line 660, in iterconsume
      try:
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/neutron/openstack/common/rpc/impl_kombu.py", line 590, in ensure
      def close(self):
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/neutron/openstack/common/rpc/impl_kombu.py", line 531, in reconnect
      # to return an error not covered by its transport
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/neutron/openstack/common/rpc/impl_kombu.py", line 513, in _connect
      Will retry up to self.max_retries number of times.
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/neutron/openstack/common/rpc/impl_kombu.py", line 150, in reconnect
      use the callback passed during __init__()
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/kombu/entity.py", line 508, in declare
      self.queue_bind(nowait)
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/kombu/entity.py", line 541, in queue_bind
      self.binding_arguments, nowait=nowait)
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/kombu/entity.py", line 551, in bind_to
      nowait=nowait)
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/amqp/channel.py", line 1003, in queue_bind
      (50, 21),  # Channel.queue_bind_ok
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/amqp/abstract_channel.py", line 68, in wait
      return self.dispatch_method(method_sig, args, content)
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/amqp/abstract_channel.py", line 86, in dispatch_method
      return amqp_method(self, args)
    File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/amqp/channel.py", line 241, in _close
      reply_code, reply_text, (class_id, method_id), ChannelError,
  NotFound: Queue.bind: (404) NOT_FOUND - no exchange 'reply_8f19344531b448c89d412ee97ff11e79' in vhost '/'

  
  Than an RPC Timeout is raised each second in all the agents 

  ERROR neutron.agent.l3_agent [-] Failed synchronizing routers 
  TRACE neutron.agent.l3_agent Traceback (most recent call last):
  TRACE neutron.agent.l3_agent   File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/neutron/agent/l3_agent.py", line 702, in _rpc_loop
  TRACE neutron.agent.l3_agent     self.context, router_ids)    
  TRACE neutron.agent.l3_agent   File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/neutron/agent/l3_agent.py", line 79, in get_routers
  TRACE neutron.agent.l3_agent     topic=self.topic)
  TRACE neutron.agent.l3_agent   File "/opt/cloudbau/neutron-virtualenv/lib/python2.7/site-packages/neutron/openstack/common/rpc/proxy.py", line 130, in call
  TRACE neutron.agent.l3_agent     exc.info, real_topic, msg.get('method'))
  TRACE neutron.agent.l3_agent Timeout: Timeout while waiting on RPC response - topic: "q-l3-plugin", RPC method: "sync_routers" info: "<unknown>"

  This actually make the agent useless until they are all restarted.

  An analyze of what's going on coming soon :)

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