Open Stack

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Hi,

I just want to notice that we already have encounter this kind of issue 
with neutron/oslo.messaging:

http://lists.openstack.org/pipermail/openstack-dev/2014-November/051477.html
http://lists.openstack.org/pipermail/openstack-dev/2014-November/051515.html

oslo.messaging have some warning messages and/or recover thing, 
depending of the used driver, examples:

https://github.com/openstack/oslo.messaging/blob/master/oslo_messaging/_drivers/protocols/amqp/driver.py#L219
https://github.com/openstack/oslo.messaging/blob/master/oslo_messaging/_drivers/impl_qpid.py#L606

By chance, neutron (and other?) works for two reasons:
* the lazy connection creation, even the process have been forked, most 
of the FDs are yet opened.
* for the already opened FDs, new child don't use them even all parents 
oslo.messaging stuffs live in new process too.

(expected for the qpid driver that doesn't work with neutron and 
multiple worker, because python-qpid creates a global object that cannot 
be reseted)


For the history, we have this kind of issue, because the (very) old db 
and messaging API was using an unique global object without any lock 
system,
then the ProcessLauncher appear, and this kind of issue appears.

I'm in favor of updating the Service.py API to guide the developer to do 
the right thing when they want multiple workers.

Cheers,
- ---
Mehdi Abaakouk
mail: sileht at sileht.net
irc: sileht


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