mongodb connection timeout error with mongoose and nodejs

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.