Comment 5 for bug 1708039

Oh here is the discover_hosts call:

http://logs.openstack.org/54/489754/3/check/gate-grenade-dsvm-neutron-multinode-ubuntu-xenial/7e19ce3/logs/grenade.sh.txt.gz#_2017-08-01_21_56_47_845

2017-08-01 21:56:47.845 | + ./post-stack.sh:main:8 : /opt/stack/old/devstack/tools/discover_hosts.sh
2017-08-01 21:56:50.142 | /usr/local/lib/python2.7/dist-packages/pymysql/cursors.py:166: Warning: (3090, u"Changing sql mode 'NO_AUTO_CREATE_USER' is deprecated. It will be removed in a future release.")
2017-08-01 21:56:50.142 | result = self._query(query)
2017-08-01 21:56:50.268 | Found 2 cell mappings.
2017-08-01 21:56:50.268 | Skipping cell0 since it does not contain hosts.
2017-08-01 21:56:50.268 | Getting compute nodes from cell: b2890c36-f40c-4272-9fa9-3da7d8ec9b0f
2017-08-01 21:56:50.268 | 2017-08-01 21:56:50.268 19869 DEBUG oslo_concurrency.lockutils [req-22c8b9d6-d020-457c-9c18-868bc468a067 - -] Lock "b2890c36-f40c-4272-9fa9-3da7d8ec9b0f" acquired by "nova.context.get_or_set_cached_cell_and_set_connections" :: waited 0.000s inner /usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:270
2017-08-01 21:56:50.269 | 2017-08-01 21:56:50.269 19869 DEBUG oslo_concurrency.lockutils [req-22c8b9d6-d020-457c-9c18-868bc468a067 - -] Lock "b2890c36-f40c-4272-9fa9-3da7d8ec9b0f" released by "nova.context.get_or_set_cached_cell_and_set_connections" :: held 0.001s inner /usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:282
2017-08-01 21:56:50.357 | Found 1 computes in cell: b2890c36-f40c-4272-9fa9-3da7d8ec9b0f
2017-08-01 21:56:50.357 | Checking host mapping for compute host 'ubuntu-xenial-2-node-osic-cloud1-disk-10201108': 2365307a-c87d-4545-aff9-c8762a087954

So that discovers ubuntu-xenial-2-node-osic-cloud1-disk-10201108 which is the first compute node, but it doesn't discover the subnode compute node, which is created at 2017-08-01 21:56:50.543 - which is 3 seconds after discover_hosts runs.