how to solve this transaction error in mlab? [MongoError: Transaction numbers are … support document-level locking]

Question

I\'m trying to do a simple transaction using mongoose. It worked totally fine on MongoDB Atlas, but in mlab I got such an error: Mon

Answer 1

This worked for me by adding retryWrites=false ;

Current URL

 mongodb://<user>:<password>@ds0145508.mlab.com:11508/testdb

New URL

mongodb://<user>:<password>@ds0145508.mlab.com:11508/testdb?retryWrites=false 

Answer 2

mlab.com runs mongodb 3.6, while the newest is 4.2.x and tools, db connectors, etc., want to use 4.x features.

In short, mlab.com is outdated.

Answer 3

I have same issue, then I contact mlab help, here is their reply:

That error indicates your app/driver is attempting to use a feature that's not compatible with your Shared Cluster deployment, which employs the MMAPv1 storage einge. It's likely that you have retryable writes (https://docs.mongodb.com/manual/core/retryable-writes/) enabled. Can you try turning that feature off in the connection string (https://docs.mongodb.com/manual/reference/connection-string/#urioption.retryWrites), or directly from your driver settings?

Please let us know if you continue to experience this error after turning off this feature.

Based on this answer, I appended retryWrites=false in mongodb connection url, then it works well.