[Bug 1420572] Re: race between neutron-ovs-cleanup and nova-compute

[Edward Hope-Morley]

I have tested both the attached Icehouse and Juno patches and can
confirm that they behave as expected i.e.

Installed nova-compute + neutron-plugin-openvswitch-agent (which
installs neutron-ovs-cleanup)

In /var/log/upstart/nova-compute.log I get as expected:

libvirt-bin start/running, process 1409
wait-for-state stop/waiting
neutron-ovs-cleanup stop/waiting
wait-for-state stop/waiting

And if I add a 10 second delay to /usr/bin/neutron-ovs-cleanup I get as
expected:

(time sudo service neutron-ovs-cleanup restart &); time sudo service nova-compute restart
nova-compute stop/waiting
neutron-ovs-cleanup stop/waiting
neutron-ovs-cleanup start/running

real	0m10.460s
user	0m0.010s
sys	0m0.015s
nova-compute start/running, process 3026

real	0m10.468s
user	0m0.010s
sys	0m0.014s

So, nova-compute will now always wait for ovs-cleanup to complete and I
tested that if ovs-cleanup is not installed it gets ignored and nova-
compute starts.

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https://bugs.launchpad.net/bugs/1420572

Title:
  race between neutron-ovs-cleanup and nova-compute

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