Comment 2 for bug 1643500

Cinder team, can you check this?

<155>Nov 19 20:00:31 node-1 cinder-scheduler: 2016-11-19 20:00:31.011 24431 ERROR cinder.service [req-ae9385c1-8cd2-4a71-b96a-9f36ed5992c5 - - - - -] model server went away
2016-11-19 20:00:31.011 24431 ERROR cinder.service Traceback (most recent call last):
2016-11-19 20:00:31.011 24431 ERROR cinder.service File "/usr/lib/python2.7/dist-packages/cinder/service.py", line 321, in report_state
2016-11-19 20:00:31.011 24431 ERROR cinder.service service_ref = objects.Service.get_by_id(ctxt, self.service_id)
2016-11-19 20:00:31.011 24431 ERROR cinder.service File "/usr/lib/python2.7/dist-packages/oslo_versionedobjects/base.py", line 181, in wrapper
2016-11-19 20:00:31.011 24431 ERROR cinder.service result = fn(cls, context, *args, **kwargs)
2016-11-19 20:00:31.011 24431 ERROR cinder.service File "/usr/lib/python2.7/dist-packages/cinder/objects/base.py", line 166, in get_by_id
2016-11-19 20:00:31.011 24431 ERROR cinder.service orm_obj = db.get_by_id(context, model, id, *args, **kwargs)
2016-11-19 20:00:31.011 24431 ERROR cinder.service File "/usr/lib/python2.7/dist-packages/cinder/db/api.py", line 1127, in get_by_id
2016-11-19 20:00:31.011 24431 ERROR cinder.service return IMPL.get_by_id(context, model, id, *args, **kwargs)
2016-11-19 20:00:31.011 24431 ERROR cinder.service File "/usr/lib/python2.7/dist-packages/cinder/db/sqlalchemy/api.py", line 193, in wrapper
2016-11-19 20:00:31.011 24431 ERROR cinder.service return f(*args, **kwargs)
2016-11-19 20:00:31.011 24431 ERROR cinder.service File "/usr/lib/python2.7/dist-packages/cinder/db/sqlalchemy/api.py", line 4451, in get_by_id
2016-11-19 20:00:31.011 24431 ERROR cinder.service return _GET_METHODS[model](context, id, *args, **kwargs)
2016-11-19 20:00:31.011 24431 ERROR cinder.service File "/usr/lib/python2.7/dist-packages/cinder/db/sqlalchemy/api.py", line 175, in wrapper
2016-11-19 20:00:31.011 24431 ERROR cinder.service return f(*args, **kwargs)
2016-11-19 20:00:31.011 24431 ERROR cinder.service File "/usr/lib/python2.7/dist-pack