MongoDB Connections not Closing

[cillaeslopes]

Is there an existing issue for this?

• [X] I have searched the existing issues

Current behavior

MongoDB connections doesn't seem to be closed after request is over. I've been monitoring the number of open connections on Compass and it gets higher and higher.

When I start the application it starts with 13 connections

If I simulate a high number of simultaneos requests it goes up to 35 connections

Then it never gets back to 13 so it only gets higher.

Minimum reproduction code

https://github.com/cillaeslopes/nest-mongo-test

Steps to reproduce

• npm i
• npm run start:watch

Then in another terminal:

• node scripts/high-traffic.js

And observe mongodb connections with:

• db.serverStatus().connections

Expected behavior

I'd expect the number of connections to get back to initial state once the requests are done

Package version

10.0.2

mongoose version

8.0.1

NestJS version

10.3.2

Node.js version

20.11.1

In which operating systems have you tested?

• [ ] macOS
• [ ] Windows
• [X] Linux

Other

No response

[kamilmysliwiec]

Thank you for taking the time to submit your report! From the looks of it, this could be better discussed on our Discord. If you haven't already, please join here and send a new post in the #⁠ 🐈 nestjs-help forum. Make sure to include a link to this issue, so you don't need to write it all again. We have a large community of helpful members, who will assist you in getting this to work.