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[Launchpad Bug Tracker <1632041@xxxxxxxxxxxxxxxxxx>]

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Immediately after starting nova-compute service on the host, if
concurrent instance creation operations are triggered on the same host,
both the workflows try to define the static network filters and the
latter one fails with 'nova-no-nd-reflection filter already exists'.

Log snippet:

2016-08-07 05:40:57.628 17601 ERROR nova.scheduler.utils [req-137df929-3b97-4437-b26d-3280dcbcd8e3 b5dc09cde3ac440d9060d6cc89f7ba71 87841dbf785d4ff3a43d5fd5c53ead50 - - -] [insta
nce: b8d573aa-1aae-4dec-a275-ae8c82f4a274] Error from last host: dc5e6fb9-bcd1-4548-ad2e-4e571b783fe8 (node cinder-glance-centos7-10-4-252-239.platform9.sys): [u'Traceback (most 
recent call last):\n', u' File "/opt/pf9/venv/lib/python2.7/site-packages/nova/compute/manager.py", line 2128, in _do_build_and_run_instance\n filter_properties)\n', u' File
"/opt/pf9/venv/lib/python2.7/site-packages/nova/compute/manager.py", line 2284, in _build_and_run_instance\n instance_uuid=instance.uuid, reason=six.text_type(e))\n', u"Resch
eduledException: Build of instance b8d573aa-1aae-4dec-a275-ae8c82f4a274 was re-scheduled: operation failed: filter 'nova-no-nd-reflection' already exists with uuid 60ba4736-64c7-
42c3-8efe-e6919dec44d2\n"]
2016-08-07 05:40:57.865 17601 WARNING nova.scheduler.utils [req-137df929-3b97-4437-b26d-3280dcbcd8e3 b5dc09cde3ac440d9060d6cc89f7ba71 87841dbf785d4ff3a43d5fd5c53ead50 - - -] Fail
ed to compute_task_build_instances: No valid host was found. 
Traceback (most recent call last):
File "/opt/pf9/nova/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 150, in inner
return func(*args, **kwargs)
File "/opt/pf9/nova/lib/python2.7/site-packages/nova/scheduler/manager.py", line 84, in select_destinations
filter_properties)
File "/opt/pf9/nova/lib/python2.7/site-packages/nova/scheduler/filter_scheduler.py", line 96, in select_destinations
raise exception.NoValidHost(reason=msg)
NoValidHost: No valid host was found.

** Affects: nova
     Importance: Undecided
     Assignee: Pooja Ghumre (pooja-9)
         Status: New

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Concurrent nova instance creation fails with nova-no-nd-reflection filter already exists error
https://bugs.launchpad.net/bugs/1632041
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