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[Matt Riedemann <mriedem@xxxxxxxxxx>]

*** This bug is a duplicate of bug 1419115 ***
    https://bugs.launchpad.net/bugs/1419115

If a bug is a duplicate, let's mark it as such so we don't track
multiple things for the same issue.

** This bug has been marked a duplicate of bug 1419115
   IndexError adding host to availability zone

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https://bugs.launchpad.net/bugs/1507493

Title:
  Adding a host to an aggregate will give a traceback if service is
  disabled

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  When you disable the compute service of a host you cannot add it to an
  aggregate.

  To reproduce (tested on Kilo MOS packages on Ubuntu 14.04):

  # nova-manage service disable compute01 nova-compute
  # nova aggregate-add-host az1 compute01
  ERROR (ClientException): The server has either erred or is incapable of performing the requested operation. (HTTP 500)

  In the nova-api.log:

  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack Traceback (most recent call last):
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/__init__.py", line 125, in __call__
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     return req.get_response(self.application)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1320, in send
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     application, catch_exc_info=False)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/webob/request.py", line 1284, in call_application
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     app_iter = application(self.environ, start_response)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     return resp(environ, start_response)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/keystonemiddleware/auth_token/__init__.py", line 634, in __call__
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     return self._call_app(env, start_response)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/keystonemiddleware/auth_token/__init__.py", line 554, in _call_app
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     return self._app(env, _fake_start_response)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     return resp(environ, start_response)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     return resp(environ, start_response)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/routes/middleware.py", line 131, in __call__
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     response = self.app(environ, start_response)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     return resp(environ, start_response)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 130, in __call__
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     resp = self.call_func(req, *args, **self.kwargs)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/webob/dec.py", line 195, in call_func
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     return self.func(req, *args, **kwargs)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/wsgi.py", line 756, in __call__
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     content_type, body, accept)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/wsgi.py", line 821, in _process_stack
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     action_result = self.dispatch(meth, request, action_args)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/wsgi.py", line 911, in dispatch
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     return method(req=request, **action_args)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/contrib/aggregates.py", line 178, in action
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     return _actions[action](req, id, data)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/contrib/aggregates.py", line 51, in wrapped
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     return fn(self, req, id, host, *args, **kwargs)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/contrib/aggregates.py", line 188, in _add_host
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     aggregate = self.api.add_host_to_aggregate(context, id, host)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 88, in wrapped
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     payload)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     six.reraise(self.type_, self.value, self.tb)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 71, in wrapped
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     return f(self, context, *args, **kw)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/nova/compute/api.py", line 3679, in add_host_to_aggregate
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     aggregate=aggregate)
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack   File "/usr/lib/python2.7/dist-packages/nova/compute/api.py", line 3597, in is_safe_to_update_az
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack     host_az = host_azs.pop()
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack IndexError: pop from empty list
  2015-10-19 07:44:51.727 38561 TRACE nova.api.openstack

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