We are using MongoDB version 3.6.8 with replica set. And using mongodb node package version 3.1.10 to connect.

Our code to connect is,

let client = new MongoClient(getUrl(), getOptions());

//getUrl() format is 'mongodb://<>'

client.connect(function (err) {

    // This callback is not executed

    if (err) {

        log('Error in connecting to MongoDb', err);

        return callback(err);

    }

    log('Successfully Connected...');

    callback();

});

We observed from our logs that the callback is not called sometimes. Is this a known issue? I could find some similar issues reported for different versions but they are closed now.
https://jira.mongodb.org/browse/NODE-1039
https://jira.mongodb.org/browse/NODE-1395
https://jira.mongodb.org/browse/NODE-1402

We are not able to reproduce this issue always. The issue happens for the initial connection after fail-over. Wanted to check if this has to be handled at our application level?(like trying to connect again if the callback is not called for long duration).