Mongodb游标ID在服务器上无效

Question

我正在查询一个包含大约400万份文档的集合。

使用python脚本循环遍历它时，在大约5000个文档之后总会出现错误

Traceback (most recent call last):
  File "geturl.py", line 16, in <module>
    for dict in  collection.find():
  File "/usr/local/lib/python2.7/dist-packages/pymongo/cursor.py", line 814, in next
    if len(self.__data) or self._refresh():
  File "/usr/local/lib/python2.7/dist-packages/pymongo/cursor.py", line 776, in _refresh
    limit, self.__id))
  File "/usr/local/lib/python2.7/dist-packages/pymongo/cursor.py", line 720, in __send_message
    self.__uuid_subtype)
  File "/usr/local/lib/python2.7/dist-packages/pymongo/helpers.py", line 93, in _unpack_response
    cursor_id)
pymongo.errors.OperationFailure: cursor id '3664670275997321547' not valid at server

我可以在配置中做些什么吗？更改Batchsize矿石？