When to use workers vs cluster in Node.js - Quick Revision & Key Differences

Recall & Review

beginner

What is the main purpose of using the Node.js cluster module?

The cluster module helps create multiple Node.js processes (workers) to share the same server port, improving performance by using multiple CPU cores.

intermediate

What are workers in Node.js, and how do they differ from cluster workers?

Workers are separate threads created using the worker_threads module for CPU-intensive tasks, while cluster workers are separate processes mainly used to handle multiple requests concurrently.

beginner

When should you use workers instead of cluster in Node.js?

Use workers for CPU-heavy tasks that can block the event loop, like calculations or data processing, to keep the main thread responsive.

beginner

When is the cluster module more suitable than workers?

Cluster is better for scaling network servers by creating multiple processes to handle many incoming connections efficiently across CPU cores.

advanced

Can workers and cluster be used together in a Node.js application?

Yes, you can use cluster to create multiple processes and inside each process use workers for CPU-intensive tasks, combining both for better performance.

What does the Node.js cluster module primarily help with?

A Scheduling tasks at specific times

B Running CPU-heavy tasks in separate threads

C Managing database connections

D Creating multiple processes to handle network requests

The cluster module creates multiple processes to share server load and handle many requests concurrently.

Which Node.js feature is best for offloading CPU-intensive work without blocking the main thread?

A Worker threads

B Cluster module

C Event loop

D HTTP module

Worker threads run CPU-heavy tasks in parallel threads, preventing the main event loop from blocking.

What is a key difference between cluster workers and worker threads?

A Cluster workers share memory, worker threads do not

B Cluster workers are separate processes, worker threads are threads

C Worker threads are separate processes, cluster workers are threads

D Both are the same

Cluster workers run as separate processes, while worker threads run in the same process but different threads.

When should you prefer cluster over workers in Node.js?

A For scaling network servers across CPU cores

B For running scheduled jobs

C For managing file system operations

D For CPU-intensive calculations

Cluster is designed to scale network servers by using multiple processes to handle many connections.

Can you combine cluster and worker threads in one Node.js app?

A No, they are mutually exclusive

B Only if using older Node.js versions

C Yes, cluster for scaling and workers for CPU tasks

D Only with third-party libraries

You can use cluster to create processes and inside each process use worker threads for CPU-heavy tasks.

Explain when to use Node.js workers versus the cluster module.

Think about CPU load versus handling many connections.

Describe the main differences between Node.js worker threads and cluster workers.

Focus on process vs thread and their roles.