#[Simple Meteor App for Document Sharing]

Implemetation Steps

First, let’s install Meteor.

1. If you’re on Mac or Linux, simply open a Terminal window and type:

   • curl https://install.meteor.com | /bin/sh

2. Creating a Meteor app is pretty easy. Once you’ve installed Meteor, all you need to do is go back to the Terminal and type this:

   • meteor create docshare-tutorial

3. You’ll then be able to run your brand new app locally with this:

   • cd docshare-tutorial
   • meteor docshare-tutorial

4. Add packages nedded,Here i use smart coffeescript,backbone,accounts-password,accounts-ui,etc.The accounts-password,accounts-ui are used for implement runningegistation and login facility with username,email and password. To add packages Open up a new Terminal window (since your app is already running in the first one) and enter:

   • mrt add accounts-ui
   • mrt add accounts-password

5. In this App use Smart Collections,WHich is is a complete re-write of the MongoDB Collection API for Meteor. It is designed with following 3 areas in mind

   • Speed
   • Efficiency (Memory & CPU)
   • Scalability

   To add smart collection follow below steps

   • mrt add smart-collections

6. Smart Collection is now retired & Meteor’s Collection implementation has fixes for most of the performance bottlenecks. It is also using the MongoDB oplog just like Smart Collections.

   For the above ,

    - You need to configure MongoDB for an active oplog
    - You need to use Smart Collections in your app
   

   Configure MongoDB

    * Now you need to use a separate MongoDB server
    * Start it with mongod *--replSet* meteor
    * Start a mongo shell and configure mongo as follows
    * Apply these commands
    	var config = {_id: "meteor", members: [{_id: 0, host: "127.0.0.1:27017"}]}
    	rs.initiate(config)
   

   Configure App

    * Use Smart Collections instead of Standard Collections
    * Start each Meteor instance with "OPLOG_URL" and the "MONGO_URL"
    *Apply these commands
    	export MONGO_URL=mongodb://localhost:27017/appdb
    	export OPLOG_URL=mongodb://localhost:27017/local
    	meteor
   

What is MongoDB Oplog

MongoDB oplog is the heart of MongoDB’s replication engine (replicaSets). Oplog contains a log of all the write operations occurring in Mongo. In MongoDB replication, secondaries listen to master’s oplog and apply changes accordingly.