pymongo.errors.OperationFailure:Overflow sort stage buffered data usage exceeds in internal limit

    用pymongo接口调用find().sort()方法时，出现错误。报错内容为：

>>> pymongo.errors.OperationFailure: database error: Plan executor error during find: Overflow sort stage buffered data usage of 33574037 bytes exceeds internal limit of 33554432 bytes

    这是因为在做sort()时，超过了32MB的in-memory sort。解决方法是可以在mongodb的相应数据库修改该内存上限。

    如，我的原代码是：

>>> client = MongoClient('localhost',27018)
>>> db = client['NetEase']
>>> col = db['comment_content']
>>> for item in col.find().sort('page_index',pymongo.ASCENDING):
    ...     print item['page_index']

    那么就修改为

>>> mongo --port=27018
>>> use NetEase
>>>db.adminCommand({setParameter: 1, internalQueryExecMaxBlockingSortBytes: <limit in bytes>})

就好了.