Issue with Error Code 48 When Connecting to MongoDB in Azure Functions

Question

I'm currently deploying my project on Azure Functions, with each function running in a separate function app. I’m using a centralized MongoDB database through Azure Cosmos DB for MongoDB and accessing it with Mongoose, including defined schema files. However, I'm encountering a persistent error code 48 every time I invoke a function and attempt to connect to MongoDB. To reiterate, each time I read/write data, the system tries to create the collection by issuing a CREATE command, and fails with a Error Code 48 since the collection exists. Our DB logs have thousands of failed CREATE queries and is messing up our analytics. This is causing major issues with system performance as well. Here are some additional details:

Environment: Azure Functions
Database: Cosmos DB with MongoDB API
ORM: Mongoose
Error Code: 48 (namespace already exist)

I would appreciate any insights or solutions to resolve this issue. Thank you!

Environment: Azure Functions
Database: Cosmos DB with MongoDB API
ORM: Mongoose
Error Code: 48 (namespace already exist)

I would appreciate any insights or solutions to resolve this issue. Thank you!

Answer

I think that Mongoose tries to create a collection that already exists in MongoDB. This may happen if Mongoose is set to auto-create collections when schemas are defined or when the connection initializes.

Check your schema definitions and connection setup. You can prevent automatic collection creation by using autoCreate: false in the schema options or setting autoIndex: false globally if indexes are also being created.


const schema = new mongoose.Schema({

    /* your schema definition */

}, { autoCreate: false });

Instead of attempting to create a collection every time, have a conditional check in place. Mongoose does not natively support this, but you can perform a MongoDB query using db.listCollections({ name: 'collection_name' }) to check if a collection exists before creating it.

Share via

Issue with Error Code 48 When Connecting to MongoDB in Azure Functions

1 answer

Your answer