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[Ihar Hrachyshka <1424722@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

As per
http://docs.openstack.org/developer/oslo.messaging/transport.html,

"oslo.messaging can’t ensure that forking a process that shares the same
transport object is safe for the library consumer, because it relies on
different 3rd party libraries that don’t ensure that. In certain cases,
with some drivers, it does work"

In neutron, we initialize transport object before forking workers. We do
it by calling to neutron.common.rpc:init, which is called from
neutron.common.config:init, which is called BEFORE we call
neutron.service:serve_rpc which actually forks workers.

Note that in neutron case, it's not a matter of moving the
initialization a bit lower due to the way how plugins are instantiated.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1424722

Title:
  neuton should instantiate a oslo.messaging transport after fork

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  As per
  http://docs.openstack.org/developer/oslo.messaging/transport.html,

  "oslo.messaging can’t ensure that forking a process that shares the
  same transport object is safe for the library consumer, because it
  relies on different 3rd party libraries that don’t ensure that. In
  certain cases, with some drivers, it does work"

  In neutron, we initialize transport object before forking workers. We
  do it by calling to neutron.common.rpc:init, which is called from
  neutron.common.config:init, which is called BEFORE we call
  neutron.service:serve_rpc which actually forks workers.

  Note that in neutron case, it's not a matter of moving the
  initialization a bit lower due to the way how plugins are
  instantiated.

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