after few million requests (all direct keys)
the following error has occured (happend twice)

/usr/local/lib/python2.6/site-packages/pymongo-1.9_-py2.6-linux-i686.egg/pymongo/message.py:128: DeprecationWarning: struct integer overflow masking is deprecated
Traceback (most recent call last):
File "check_user.py", line 99, in <module>
e += check_user(line.strip())
File "check_user.py", line 74, in check_user
if mdb.phones.find_one(

,

) is not None:
File "build/bdist.linux-i686/egg/pymongo/collection.py", line 469, in find_one
File "build/bdist.linux-i686/egg/pymongo/cursor.py", line 601, in next
File "build/bdist.linux-i686/egg/pymongo/cursor.py", line 564, in _refresh
File "build/bdist.linux-i686/egg/pymongo/cursor.py", line 521, in __send_message
File "build/bdist.linux-i686/egg/pymongo/connection.py", line 790, in _send_message_with_response
File "build/bdist.linux-i686/egg/pymongo/connection.py", line 771, in __send_and_receive
File "build/bdist.linux-i686/egg/pymongo/connection.py", line 761, in __receive_message_on_socket
AssertionError: ids don't match -2147483649L 2147483647