Comment 10 for bug 1453940

I have not been able to reproduce the bug as it's a race between ceph and glance. If glance is ready before ceph has posted all the required relation data then the Ceph context is empty and when ceph.conf is rendered the data is missing. Although this is not ideal from what I can see this should only be a transative state and when ceph posts the full set of data hooks should fire on the glance unit and rerender the ceph.conf fully populated so the bug is that ceph.conf is not being rendered once the context is complete.

I think I found the cause of the bug which has another symptom which is easy to reproduce:

1) Deploy ceph and relate to glance (I used this bundle: http://paste.ubuntu.com/12123358/)
2) juju status --format=tabular | grep 'ceph/' | wc -l
   3
2) juju run --unit glance/0 "grep mon /var/lib/charm/glance/ceph.conf" 2>/dev/null
   mon host = 10.5.42.205 10.5.42.206 10.5.42.207
3) juju add-unit ceph
4) Wait for ceph/3 to finish deploying
5) juju status --format=tabular | grep 'ceph/' | wc -l
   4
6) juju run --unit glance/0 "grep mon /var/lib/charm/glance/ceph.conf" 2>/dev/null
   mon host = 10.5.42.205 10.5.42.206 10.5.42.207

This list of mon hosts has not changed. The reason for this is that the glance charm will not render the ceph.conf unless it has a broker_rsp from the unit it is talking to, in this case ceph/3. But the only unit who replies with a broker_resp is the leader which is (probably) not ceph3.