

def _set_host_maintenance(self, context, host_name, mode=True):
    'Start/Stop host maintenance window. On start, it triggers\n        guest VMs evacuation.\n        '
    LOG.info(_LI('Putting host %(host_name)s in maintenance mode %(mode)s.'), {
        'host_name': host_name,
        'mode': mode,
    })
    try:
        result = self.api.set_host_maintenance(context, mode, mode)
    except NotImplementedError:
        common.raise_feature_not_supported()
    except exception.HostNotFound as e:
        raise webob.exc.HTTPNotFound(explanation=e.format_message())
    except exception.ComputeServiceUnavailable as e:
        raise webob.exc.HTTPBadRequest(explanation=e.format_message())
    if (result not in ('on_maintenance', 'off_maintenance')):
        raise webob.exc.HTTPBadRequest(explanation=result)
    return result

dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/api/openstack/compute/hosts.py HostController._set_host_maintenance/VarMisuse@58/138 `host_name`->`mode`