Blocker - Mongoose v4.9.9 hangs on call to connect()

[erezool]

It simply hangs during the mongoose.connect() (callback is never called)

[cortezcristian]

Same here, had to downgrade to v4.9.8

[jeffwhelpley]

Same here. downgraded.

[sshen81]

Same issue. As a workaround, using promises resolved it for me.

[sobafuchs]

Hm, that's weird. The callback executes for me:

const mongoose = require('mongoose');
const co = require('co');
mongoose.Promise = global.Promise;
const GITHUB_ISSUE = `gh-5249`;


exec();

function exec() {
  mongoose.connect(`mongodb://localhost:27017/${GITHUB_ISSUE}`, function() {
    co(function* () {
      const schema = new mongoose.Schema({
        name: String
      });


      const Model = mongoose.model('Model', schema);

      yield Model.remove({});

      const doc = yield Model.create({ name: 'test' });

      console.log('successfully created doc');
    }).catch(error => console.error(error));
  });
}

Can you try this script and see if it works? If not, could I see the context in which your mongoose.connect call hangs?

[erezool]

Apologies, I apparently did not mention important information:

• I overwrite mongoose default Promise to bluebird
• I try to connect to a replica set

Here's a reproducible example:

var mongoose = require('mongoose');
var bluebird = require('bluebird');

mongoose.Promise = bluebird;

var conn = 'mongodb://primary,secondary/test?replicaSet=test';
mongoose.connect(conn, function(err, result) {
        console.error('Error:', err);
});

Notice that I don't even use a promise notation for the connect.
Actual result: code hangs and console.error never printed.

[jeffwhelpley]

I am having the issue and I connect to a replica set as well. I do not override the promise library, but promises are hanging.

[vkarpov15]

Fixed, my sincerest apologies for the trouble, some of the refactoring work for #5229 made it so that the callback to mongoose.connect() doesn't get called in 4.9.9. Mongoose does connect successfully, it just doesn't call the callback. Will release 4.9.10 immediately to fix this issue 👍