Comment 0 for bug 1782448

When configured to use the memcache connection pool, clients (e.g. neutron-server) fail with:

2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors Traceback (most recent call last):
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/oslo_middleware/catch_errors.py", line 40, in __call__
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors response = req.get_response(self.application)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/webob/request.py", line 1316, in send
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors application, catch_exc_info=False)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/webob/request.py", line 1280, in call_application
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors app_iter = application(self.environ, start_response)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/webob/dec.py", line 131, in __call__
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors resp = self.call_func(req, *args, **self.kwargs)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/webob/dec.py", line 196, in call_func
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors return self.func(req, *args, **kwargs)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py", line 331, in __call__
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors response = self.process_request(req)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py", line 622, in process_request
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors resp = super(AuthProtocol, self).process_request(request)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py", line 404, in process_request
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors allow_expired=allow_expired)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py", line 434, in _do_fetch_token
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors data = self.fetch_token(token, **kwargs)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py", line 736, in fetch_token
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors cached = self._cache_get_hashes(token_hashes)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/keystonemiddleware/auth_token/__init__.py", line 719, in _cache_get_hashes
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors cached = self._token_cache.get(token)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/keystonemiddleware/auth_token/_cache.py", line 214, in get
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors with self._cache_pool.reserve() as cache:
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors return self.gen.next()
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/keystonemiddleware/auth_token/_cache.py", line 98, in reserve
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors with self._pool.get() as client:
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/eventlet/queue.py", line 295, in get
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors return self._get()
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/keystonemiddleware/auth_token/_memcache_pool.py", line 149, in _get
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors conn = ConnectionPool._get(self)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/keystonemiddleware/auth_token/_memcache_pool.py", line 97, in _get
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors conn = self._create_connection()
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/keystonemiddleware/auth_token/_memcache_pool.py", line 143, in _create_connection
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors socket_timeout=self._socket_timeout)
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors File "/usr/lib/python2.7/site-packages/memcache.py", line 223, in __init__
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors super(Client, self).__init__()
2018-07-18 21:00:32.568 14810 ERROR oslo_middleware.catch_errors TypeError: super(type, obj): obj must be an instance or subtype of type