How do I gracefully shutdown mongoose's connection pool?

Question

If I receive a SIGINT/SIGTERM (e.g. ctrl+c) then I must gracefully stop my app and close all connections to the mongodb server.

Most documentation/tutorials state that to stop a connection (or pool of connections), I must use mongoose.disconnect() - which calls .close() on connections in the pool.

However all those docs also say this should be done after all pending writes are completed.

How can I know this when I receive a signal event (e.g. SIGINT, SIGTERM, etc.)? Does mongoose have graceful shutdown functionality, or will I lose data when I call disconnect()?

(I'm using the latest bits.)

I know how to listen for signal events. What I don't know is how to ensure all writes are flushed. How to do so **gracefully**, if at all possible. — lonix, Feb 03 '19 at 13:13

score 0 · Answer 1 · answered Feb 03 '19 at 12:56

0

To receive SIGINT signal and stop a connection you can use following code:

process.on('SIGINT', () => {
    mongoose.disconnect().then(() => {
        process.exit();
    });
});

answered Feb 03 '19 at 12:56

mat.mik

97
1
8

I know how to do that. The question is how do I do so gracefully - if at all possible - so that pending writes are not lost. – lonix Feb 03 '19 at 13:12
1

It will not force closing connection. – mat.mik Feb 03 '19 at 13:38
`process.exit()` is a fail-fast approach – lonix Feb 03 '19 at 15:11
But will be invoked after mongoose.disconnect() return RESOLVED promise... – mat.mik Feb 03 '19 at 16:49

score 0 · Answer 2 · answered Oct 03 '22 at 17:55

0

Try this one;

process.on ("SIGINT", async() => {
  await mongoose.connection.close ();
  process.exit (0)
});

answered Oct 03 '22 at 17:55

Paullaster Okoth

37
7

How do I gracefully shutdown mongoose's connection pool?

2 Answers2