mongodb connection timeout error with mongoose and nodejs

Question

I desperately need some help.I am trying to upload large file(8 GB) to gridfs using mongoose and nodeJS. But as the file is very large it takes some time to upload. And after a while I get the following error:

home/user/FileUpload/node_modules/mongodb/lib/utils.js:98
    process.nextTick(function() { throw err; });
                                  ^
MongoError: connection 0 to 127.0.0.1:27017 timed out
    at Function.MongoError.create (/home/user/FileUpload/node_modules/mongodb-core/lib/error.js:29:11)
    at Socket.<anonymous> (/home/user/FileUpload/node_modules/mongodb-core/lib/connection/connection.js:186:20)
    at Object.onceWrapper (events.js:314:30)
    at emitNone (events.js:105:13)
    at Socket.emit (events.js:207:7)
    at Socket._onTimeout (net.js:402:8)
    at ontimeout (timers.js:488:11)
    at tryOnTimeout (timers.js:323:5)
    at Timer.listOnTimeout (timers.js:283:5)

I have tried to resolve this by increasing connectTimeoutMS but the error still persist. I am using MongoDB 3.4.5 mongoose 4.8.4 nodejs 8.1.4 and npm 5.0.3.

Following is app.js:

var mongoose = require('mongoose');
var schema = mongoose.schema;
mongoose.connect('mongodb://127.0.0.1/gridFS'),{
    server: {
        socketOptions: {
            socketTimeoutMS: 3000000,
            connectionTimeoutMS: 3000000,
            keepAlive:3000000
        }
    },

    replset: {
        socketOptions: {
            keepAlive: 3000000,
            connectTimeoutMS: 3000000
        }
    }
};
var conn = mongoose.connection;
var path = require('path');
var Grid = require('gridfs-stream');
var fs = require('fs');
var videoPath = path.join(__dirname, 'readFrom/bio seq test1.txt');
Grid.mongo = mongoose.mongo;
conn.once('open', function(){

    console.log('- connection open -');
    var gfs = Grid(conn.db);

    var writestream = gfs.createWriteStream({

        filename: 'bio seq test 1'
    });

    fs.createReadStream(videoPath).pipe(writestream);
    writestream.on('close', function(file){
      console.log(file.filename + 'Written to DB');
    });
});

Following is package.json file:

{
  "name": "file-upload-gridfs",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo '' && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "body-parser": "^1.16.1",
    "cookie-parser": "^1.4.3",
    "express": "^4.14.1",
    "gridfs-stream": "^1.1.1",
    "mongoose": "^4.8.4",
    "morgan": "^1.8.2",
    "multer": "1.3.0",
    "multer-gridfs-storage": "1.0.0",
    "path.join": "^1.0.0",
    "serve-favicon": "^2.4.3"
  }
}

Solution

Ok. I figured out the problem using this really helpful discussion.The default socket connection time for MongoDB is 30 seconds. If any query/operation takes longer than this the connection is aborted and connection timeout error occurs. With this change I was able to upload a 32GB file to GridFS without any interruption.

https://github.com/Automattic/mongoose/issues/4789

I was passing the timeout parameter in following way.

server: {
        socketOptions: {
            socketTimeoutMS: 3000000,
            connectionTimeoutMS: 3000000,
            keepAlive:3000000
        }
    },

    replset: {
        socketOptions: {
            keepAlive: 3000000,
            connectTimeoutMS: 3000000
        }
    }
};

But it needs to be set in the following way:

const serverOptions = {
  poolSize: 100,
  socketOptions: {
    socketTimeoutMS: 6000000
  }
};

mongoose.createConnection(dbpath, {
  server: serverOptions,
  replset: serverOptions //if you are using replication
});

In my case I have used localhost.

const serverOptions = {
    poolsize:100 ,
    socketOptions:{
        socketTimeoutMS: 6000000
        }
    };
    var mongodbUri = 'mongodb://localhost:27017/gridFS';
    mongoose.connect(mongodbUri, {
    server: serverOptions
    });

Hope this will help anyone with similar issue.