TOPIC OVERVIEW

nodejs/Clusters

Use multiple Node.js processes to take advantage of more CPU cores and handle more traffic.

15 QuestionsAdvancedHigh Priority ~12 min read

A single Node.js process primarily runs JavaScript on one main thread. The cluster approach allows an application to start multiple Node.js processes, often called workers, so incoming traffic can be distributed across multiple processes.

Clusters can help applications use multiple CPU cores and improve their ability to handle traffic. However, workers are separate processes with their own memory, so shared state, sessions, WebSocket connections, and communication between workers need careful design.

What you'll walk away knowing

How the Node.js cluster model works

How multiple worker processes share incoming traffic

Why cluster workers do not share normal application memory

When clustering is useful and what problems it introduces

1What is clustering in Node.js, and why is it needed?Intermediate 2What are the limitations of Node.js clustering?Intermediate 3How does the Node.js Cluster module work internally?Advanced 4Your Node.js server handles 10,000 concurrent users but is slow. How does clustering help?Intermediate 5How do you implement sticky sessions with Node.js clustering?Advanced 6What is the difference between cluster.fork() and child_process.fork()?Intermediate 7What is PM2 and how does it relate to Node.js clustering?Intermediate 8How do you check if the current process is a master or worker in Node.js?Intermediate 9What is the difference between the master process and a worker process in Node.js clustering?Intermediate 10What happens when a worker process crashes in a Node.js cluster?Intermediate 11How would you monitor the health of worker processes in a Node.js cluster in production?Intermediate 12How does clustering differ from using Worker Threads in Node.js?Intermediate 13How do workers in a Node.js cluster share a port without conflict?Intermediate 14How do you gracefully shut down a worker in Node.js clustering?Intermediate 15What are the two load balancing strategies in Node.js cluster, and how do you configure them?Intermediate 16How do you send messages between master and worker processes in a Node.js cluster?Intermediate 17Can workers share memory or state in a Node.js cluster?Intermediate

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File Operations

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Performance Optimisation

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