I created a bug report here: https://github.com/NodeBB/NodeBB/issues/12449

Thanks Baris. I tracked down the particular command that is causing troubles: The glob that is looking for pictures and covers to delete from the /assets/uploads/profile directory takes too long.

A quick fix will be to delete only user's cover:url (if it's a file not url) and uploadedpicture from the directory. But it won't work in general when keepAllUserImages is true. The best fix would be to store all paths to user covers and pictures and then delete them all without needing to use glob.

What do you think?

Hi again, @baris and @julian
the plugin causing restarts wasn't the only problem. I found another problem and I think it's performance related.

When a user is deleted (with API or directly in the forum), it seems that the request will block the event loop or database for a longer time than our health probe timeout allows. This is causing more restarts of our nodebb proceses.

We have a lot of users and data. The recent database upgrade we did from version 2.x to 3.x took several hours.

I turned on 'debug' log level and there are still no errors in the logs.

When we temporarily disabled user deletion, the forum doesn't restart anymore. So I hope this is the last problem after the upgrade.

Looking into the code, the process of deleting user is doing many things. Do you think that there might be something blocking the event loop when there is a really of of data of all sorts? Or do you have any tips what to check?

Thanks
Tomas

Hi Baris,
thanks for help. We finally figured it out. It was a simple error in our plugin that caused restarting NodeBB.

We are running the latest version - v3.7.1 and the forums runs in multiple nodebb processes.

Hi,

We are experiencing performance issues with our NodeBB installation. It got significantly worse after upgrading to v3.x. The forum is noticeably slowing down at times - both loading and saving up posts is slow and often we get just a 502 response.

There are several factors that might cause this: overloaded database, attackers doing a brute force requests ( I created a issue about this here https://github.com/NodeBB/NodeBB/issues/12432 ), our api calls from various places.

I would appreciate any guidance or advice on how to at least diagnose these issues - what is the biggest bottleneck.

There are tools like ip blacklists, but can you recommend any tool that handles this automatically based on incoming requests? Like a IP doing many calls ending up with a 404.