CODEWITHSUNDEEP
pythonmongodbpymongo
Codeformer
Codeformer

Reputation: 2300

How to achieve a read only connection using pymongo

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.

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

Upvotes: 1

Views: 2996

Answers (2)

Atish
Atish

Reputation: 4425

Secondaries are read-only by default. However, you can specify the read preference to read from secondaries. By default, it reads from the primary.

This can be achieved using readPreference=secondary in connection string

Upvotes: 1

Adam Harrison
Adam Harrison

Reputation: 3421

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.

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)

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

Upvotes: 3

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