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Reviewed:  https://review.openstack.org/470831
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=0ef8e2c16817830144acec07c4ea0164597df47c
Submitter: Jenkins
Branch:    master

commit 0ef8e2c16817830144acec07c4ea0164597df47c
Author: Sean McCully <sean_mccully@xxxxxxxxx>
Date:   Sun Jun 4 23:53:26 2017 -0400

    neutron-rpc-server fails with no plugins loaded
    
    Neutron RPC Server fails with exception
    "object has no attribute 'rpc_workers_supported'".
    
    Change-Id: I0997789bb61635ed36e4b95f03fc7d396511e19f
    Closes-Bug: #1687896


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1687896

Title:
  neutron-rpc-server fails to start on configuration that works under
  neutron-server

Status in neutron:
  Fix Released

Bug description:
  I'm running neutron-api under uwsgi, but noticed it's not doing any rpc stuff,
  so I figure that's what "neutron-rpc-server" is for. But it fails to start on
  configuration that works under the normal "neutron-server".

  Traceback (most recent call last):
    File "/usr/local/bin/neutron-rpc-server", line 10, in <module>
      sys.exit(main_rpc_eventlet())
    File "/opt/stack/neutron/neutron/cmd/eventlet/server/__init__.py", line 23, in main_rpc_eventlet
      server.boot_server(rpc_eventlet.eventlet_rpc_server)
    File "/opt/stack/neutron/neutron/server/__init__.py", line 42, in boot_server
      server_func()
    File "/opt/stack/neutron/neutron/server/rpc_eventlet.py", line 33, in eventlet_rpc_server
      rpc_workers_launcher = service.start_rpc_workers()
    File "/opt/stack/neutron/neutron/service.py", line 269, in start_rpc_workers
      rpc_workers = _get_rpc_workers()
    File "/opt/stack/neutron/neutron/service.py", line 163, in _get_rpc_workers
      if not plugin.rpc_workers_supported():
  AttributeError: 'NoneType' object has no attribute 'rpc_workers_supported'

  In neutron/neutron/service.py:
  from neutron_lib.plugins import directory

  def _get_rpc_workers():
      plugin = directory.get_plugin()
      service_plugins = directory.get_plugins().values()

  I'm not sure what directory.get_plugin() does or how it works, but it doesn't
  return anything of use apparently.

  
  You should be able to reproduce quite easily by running

  neutron-server --config-file neutron.conf
  neutron-rpc-server --config-file neutron.conf

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