Scaling Types

• X Axis
• Y Axis
• Z Axis

Node.js Native Modules

• cluster
• os
• spawn

Resources and techniques

Some techniques are implemented using stack other than node.js, but the concept is more important to comprehend and implement for better performance of the application

Blogs

• Scaling Node.js Applications
• A Beginner's Guide To Scaling To 11 Million+ Users On Amazon's AWS
• Good practices for high-performance and scalable Node.js applications [Part 1/3]
• Good practices for high-performance and scalable Node.js applications [Part 2/3]
• Good practices for high-performance and scalable Node.js applications [Part 3/3]
• Scaling Up to Your First 10 Million Users
• Scaling Machine Learning from 0 to millions of users — part 1
• Scaling Machine Learning from 0 to millions of users — part 2
• https://cloudifie.com/uncategorized/scaling-from-mvp-to-10-million-users/
• Scaling on AWS Part I: A Primer
• Scaling on AWS (Part 2): > 10K Users
• Scaling on AWS (Part 3): >500K Users
• Scaling on AWS (Part 4) : > One Million Users
• Deploying and scaling Node.js on Google Kubernetes Engine with Continuous Integration
• Instagration Pt. 2: Scaling our infrastructure to multiple data centers
• Using Rust to Scale Elixir for 11 Million Concurrent Users
• How to scale a Nodejs app based on number of users
• Scaling Node.js Socket Server with Nginx and Redis
• NODE.JS scalability problems and how to solve them 🚀
• Divide and conquer: Scale your Node.js app using distributed queues
• Serving Millions of Users in Real-Time with Node.js & Microservices [Case Study]
• Scalability in NodeJS Creating a Zero-downtime cluster
• Monitoring & Vertically Scaling Node.js Applications
• Node.js scaling in highload
• How to Scale your Node.js app: Best Strategies and Built-in Tools for Scalability
• Securing and Scaling up Node.js Applications
• Scaling-out with Node Clusters
• Handling blocking operations in Node
• Interrupts and Request Memoization

Videos

• Tech Talk: Server Scaling in Node.js
• The Art of Building Node.js Projects at Scale
• Scaling Your Node.JS API Like a Boss (Part One)
• Scaling Your Node.JS API Like a Boss (Part Two)
• Scaling NodeJS - Abhinav Rastogi, Flipkart
• Abhinav Rastogi: Scaling NodeJS beyond the ordinary JSConf Iceland 2018
• Modular-services in a NodeJS monolith - Naval Saini, Flip Flop App
• Scaling Real-time Apps on Cloud Foundry Using Node.js and Redis
• Node JS - Scaling Applications - Clusters
• Node JS - Scaling Applications - Architecting Zero Downtime
• Node JS - Scaling Applications - PM2
• Using Clean Architecture for Microservice APIs in Node.js with MongoDB and Express
• Scaling NodeJS apps with N-API by Ruben Harutyunyan(Arm) JSConfAM19
• Enterprise Node.JS Apps in 2018
• Node JS - Scaling Applications
• Scaling Node.js Applications with Kubernetes and Docker - Erick Wendel, EW.IT
• Node.js at Scale with Erik Toth
• Architect for Scale - My Learnings in Node.js (A case study)
• Node.js Performance and Highly Scalable Micro-Services - Chris Bailey, IBM
• Scaling Node.js Applications with Kubernetes and Docker
• require('lx') - Scaling Node.js to 500 million Users by João Parreira
• The Node.js Event Loop: Not So Single Threaded
• Scalable Microservices with gRPC, Kubernetes, and Docker by Sandeep Dinesh, Google
• Node.js at Netflix
• Node.js: Deploying, Monitoring and Scaling
• A Million Connections...and Beyond! - Node.js at Scale
• Load Balancing with NGINX

Example Code

Cluster

Check number of CPUs

const cluster = require("cluster"); // Cluster Native Module
const cpus = require("os").cpus().length; // Number of CPUs

console.log("Number of CPUs available - ", cpus)

Full Clustering Example

const http = require("http");
const cluster = require("cluster"); // Cluster Native Module
const cpus = require("os").cpus().length; // Number of CPUs
const port = process.env.PORT || 3000;

if (cluster.isMaster) {
  // Checking whether the current cluser is master or not.Boolean value is returned
  console.log("Master CPU - ", process.pid);

  for (var i = 0; i < cpus; i++) {
    cluster.fork(); // Forking a new process from the cluster
  }

  cluster.on("exit", (worker) => {
    console.log("Worker Process has died - " + process.pid); // Process that exited/died.
    console.log("Process Remaining - " + Object.keys(cluster.workers).length); // Prints the number of running workers at any instance
    console.log("Starting New Working");
    console.log("Process Remaining - " + Object.keys(cluster.workers).length);
  });
} else {
  http
    .createServer((req, res) => {
      message = `Running Process: ${process.pid}`;
      res.end(message);

      // For Testing Purpose. Uncomment the following code to kill process by sending GET request to '/kill'

      //   if (req.url === "/kill") {
      //     process.exit();
      //   } else {
      //     console.log(process.pid);
      //   }
    })
    .listen(port);
}

Zero - Downtime Example

const http = require("http");
const cluster = require("cluster"); // Cluster Native Module
const cpus = require("os").cpus().length; // Number of CPUs
const port = process.env.PORT || 3000;

if (cluster.isMaster) {
  // Checking whether the current cluser is master or not.Boolean value is returned
  console.log("Master CPU - ", process.pid);

  for (var i = 0; i < cpus; i++) {
    cluster.fork(); // Forking a new process from the cluster
  }

  cluster.on("exit", (worker) => {
    console.log("Worker Process has died - " + process.pid); // Process that exited/died.
    console.log("Process Remaining - " + Object.keys(cluster.workers).length); // Prints the number of running workers at any instance
    console.log("Starting New Working");
    cluster.fork(); // Creating a new process again after the previous process exited so that max number of cpus are utilised.
    console.log("Process Remaining - " + Object.keys(cluster.workers).length);
  });
} else {
  http
    .createServer((req, res) => {
      message = `Running Process: ${process.pid}`;
      res.end(message);

      // For Testing Purpose. Uncomment the following code to kill process by sending GET request to '/kill'

      //   if (req.url === "/kill") {
      //     process.exit();
      //   } else {
      //     console.log(process.pid);
      //   }
    })
    .listen(port);
}