I can reproduce the issue with the following code:

import sys
from oslo_config import cfg
from oslo_db import options
import logging

from oslo_db import concurrency

CONF = cfg.CONF
#CONF.default_config_files=['/etc/nova/nova.conf']

_BACKEND_MAPPING = {'sqlalchemy': 'nova.db.sqlalchemy.api'}
IMPL = concurrency.TpoolDbapiWrapper(CONF, backend_mapping=_BACKEND_MAPPING)

def select_db_reader_mode(f):
    """Decorator to select synchronous or asynchronous reader mode.

    The kwarg argument 'use_slave' defines reader mode. Asynchronous reader
    will be used if 'use_slave' is True and synchronous reader otherwise.
    """
    return IMPL.select_db_reader_mode(f)

@select_db_reader_mode
def _db_service_get_by_compute_host(context, host, use_slave=False):
    print('yessss')

logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)
handler = logging.StreamHandler(sys.stdout)
handler.setLevel(logging.DEBUG)
logger.addHandler(handler)

CONF.register_opts(options.database_opts, 'database')
CONF.log_opt_values(logger, logging.WARNING)








Traceback (most recent call last):
  File "reprod.py", line 23, in <module>
    def _db_service_get_by_compute_host(context, host, use_slave=False):
  File "reprod.py", line 20, in select_db_reader_mode
    return IMPL.select_db_reader_mode(f)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 72, in __getattr__
    return getattr(self._api, key)
  File "/usr/lib/python2.7/site-packages/oslo_db/concurrency.py", line 58, in _api
    conf=self._conf, backend_mapping=self._backend_mapping)
  File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 304, in from_config
    conf.register_opts(options.database_opts, 'database')
  File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 2055, in __inner
    result = f(self, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 2317, in register_opts
    self.register_opt(opt, group, clear_cache=False)
  File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 2059, in __inner
    return f(self, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 2293, in register_opt
    return group._register_opt(opt, cli)
  File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 1497, in _register_opt
    if _is_opt_registered(self._opts, opt):
  File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 367, in _is_opt_registered
    if opts[opt.dest]['opt'] != opt:
RuntimeError: maximum recursion depth exceeded