[pypy-issue] Issue #2402: TypeError: object.__new__(_MemcacheClient) is not safe, use _MemcacheClient.__new__() (pypy/pypy)

[Peter Wang]

New issue 2402: TypeError: object.__new__(_MemcacheClient) is not safe, use _MemcacheClient.__new__()
https://bitbucket.org/pypy/pypy/issues/2402/typeerror-object__new__-_memcacheclient-is

Peter Wang:

Hi, 

I am running tempest or an OpenStack gate testing, and getting this error: 
TypeError: object.__new__(_MemcacheClient) is not safe, use _MemcacheClient.__new__()

while running under PyPy2.  
The error is coming from this file:
site-packages/oslo_cache/_memcache_pool.py
which is attached.

However, same code works under CPython2.7.  This may or may not be a PyPy bug, but would someone give me some suggestions on how to fix it?  Tried to google around, and it seems related to class/object contructor, and how object is being instantiated, and passing global variables.   But I don't understand how this works under CPython2.7.

thanks,

peter


7910 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 CRITICAL keystone [-] TypeError: object.__new__(_MemcacheClient) is not safe, use _MemcacheClient.__new__()
7911 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 TRACE keystone Traceback (most recent call last):
7912 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/usr/local/bin/keystone-manage", line 10, in <module>
7913 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 TRACE keystone     sys.exit(main())
7914 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/stack/keystone/keystone/cmd/manage.py", line 44, in main
7915 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 TRACE keystone     cli.main(argv=sys.argv, config_files=config_files)
7916 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/stack/keystone/keystone/cmd/cli.py", line 1254, in main
7917 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 TRACE keystone     CONF.command.cmd_class.main()
7918 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/stack/keystone/keystone/cmd/cli.py", line 363, in main
7919 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 TRACE keystone     klass.do_bootstrap()
7920 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/stack/keystone/keystone/cmd/cli.py", line 189, in do_bootstrap
7921 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 TRACE keystone     domain=default_domain)
7922 2016-09-14 21:21:56.470 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/stack/keystone/keystone/common/manager.py", line 124, in wrapped
7923 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     __ret_val = __f(*args, **kwargs)
7924 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/stack/keystone/keystone/resource/core.py", line 759, in create_domain
7925 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     domain_id, project_from_domain, initiator)
7926 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/stack/keystone/keystone/common/manager.py", line 124, in wrapped
7927 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     __ret_val = __f(*args, **kwargs)
7928 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/stack/keystone/keystone/resource/core.py", line 230, in create_project
7929 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     self.get_project.set(ret, self, project_id)
7930 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/site-packages/dogpile/cache/region.py", line 1228, in set_
7931 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     self.set(key, value)
7932 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/site-packages/dogpile/cache/region.py", line 972, in set
7933 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     key = self.key_mangler(key)
7934 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/stack/keystone/keystone/common/cache/core.py", line 87, in key_mangler
7935 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     key = '%s:%s' % (key, invalidation_manager.region_id)
7936 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/stack/keystone/keystone/common/cache/core.py", line 45, in region_id
7937 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     self._region_key, self._generate_new_id, expiration_time=-1)
7938 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/site-packages/dogpile/cache/region.py", line 825, in get_or_create
7939 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     async_creator) as value:
7940 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/site-packages/dogpile/lock.py", line 154, in __enter__
7941 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     return self._enter()
7942 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/site-packages/dogpile/lock.py", line 87, in _enter
7943 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     value = value_fn()
7944 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/site-packages/dogpile/cache/region.py", line 780, in get_value
7945 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     value = self.backend.get(key)
7946 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/site-packages/dogpile/cache/backends/memcached.py", line 161, in get
7947 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     value = self.client.get(key)
7948 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/lib_pypy/_functools.py", line 42, in __call__
7949 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     return self._func(*(self._args + fargs), **fkeywords)
7950 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/site-packages/oslo_cache/backends/memcache_pool.py", line 35, in _run_method
7951 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     with self.client_pool.acquire() as client:
7952 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/lib-python/2.7/contextlib.py", line 17, in __enter__
7953 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     return self.gen.next()
7954 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/site-packages/oslo_cache/_memcache_pool.py", line 128, in acquire
7955 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     conn = self.get(timeout=self._connection_get_timeout)
7956 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/lib-python/2.7/Queue.py", line 178, in get
7957 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     item = self._get()
7958 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/site-packages/oslo_cache/_memcache_pool.py", line 215, in _get
7959 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     conn = ConnectionPool._get(self)
7960 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/site-packages/oslo_cache/_memcache_pool.py", line 166, in _get
7961 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     conn = self._create_connection()
7962 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone   File "/opt/pypy/site-packages/oslo_cache/_memcache_pool.py", line 207, in _create_connection
7963 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone     return _MemcacheClient(self.urls, **self._arguments)
7964 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone TypeError: object.__new__(_MemcacheClient) is not safe, use _MemcacheClient.__new__()
7965 2016-09-14 21:21:56.471 | 2016-09-14 14:21:56.468 26064 TRACE keystone