如何使用pymongo实现只读连接 [英] How to achieve a read only connection using pymongo

问题描述

如何实现与MongoDB辅助节点的只读连接. 我有一个主节点和两个辅助节点.我想要与次要节点的只读连接.

How to achieve a read-only connection to the secondary nodes of the MongoDB. I have a primary node and two secondary nodes. I want a read-only connection to secondary nodes.

我尝试了MongoReplicaSetClient，但没有得到我想要的东西. 可以与主节点建立只读连接吗?

I tried MongoReplicaSetClient but did not get what I wanted. Is it possible to have a read-only connection to primary node?

推荐答案

您将要指定阅读查询. 次要首选的读取首选项将发送查询到次要节点，但如果次要节点不可用，则会回退到主要节点.

You'll want to specify a Read Preference on your queries. A read preference of Secondary Preferred will send queries to a Secondary node but will fall back to the Primary in the event that a Secondary is not available.

在pymongo中的读取首选项在MongoClient中配置:

The read preference in pymongo is configured in the MongoClient:

>>> client = MongoClient(
...     'localhost:27017',
...     replicaSet='foo',
...     readPreference='secondaryPreferred')
>>> client.read_preference
SecondaryPreferred(tag_sets=None)

更多信息(以及上述信息的来源)可以找到这里.

More information (and source of above) can be found here.

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