Comment 2 for bug 1119641

I'm using keystone 2013.1~rc1 and I have the same king of backtrace:

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/keystone/common/wsgi.py", line 236, in __call__
    result = method(context, **params)
  File "/usr/lib/python2.7/dist-packages/keystone/token/controllers.py", line 142, in authenticate
    token_id=token_id)
  File "/usr/lib/python2.7/dist-packages/keystone/common/manager.py", line 47, in _wrapper
    return f(*args, **kw)
  File "/usr/lib/python2.7/dist-packages/keystone/token/backends/memcache.py", line 58, in get_token
    token = self.client.get(ptk)
  File "/usr/lib/python2.7/dist-packages/memcache.py", line 862, in get
    return self._get('get', key)
  File "/usr/lib/python2.7/dist-packages/memcache.py", line 813, in _get
    self.check_key(key)
  File "/usr/lib/python2.7/dist-packages/memcache.py", line 1023, in check_key
    % self.server_max_key_length)
MemcachedKeyLengthError: Key length is > 250