Load balancing between workers in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is load balancing between workers in Node.js?

Load balancing between workers means distributing incoming tasks or requests evenly across multiple worker processes to improve performance and reliability.

beginner

Which Node.js module helps create worker processes for load balancing?

The 'cluster' module allows Node.js to create multiple worker processes that share the same server port, enabling load balancing.

intermediate

How does the Node.js cluster module distribute incoming connections by default?

By default, the cluster module uses a round-robin approach on most platforms, sending each new connection to the next available worker in order.

beginner

Why is load balancing important when using multiple workers?

Load balancing prevents any single worker from becoming overloaded, which helps keep the app responsive and stable under heavy traffic.

intermediate

What happens if a worker crashes in a Node.js cluster setup?

The master process can detect the crash and spawn a new worker to replace it, maintaining the load balancing and availability.

Which Node.js module is commonly used for load balancing between workers?

A http

B cluster

C fs

D events

The 'cluster' module is designed to create worker processes and balance load between them.

What load balancing method does Node.js cluster use by default on most platforms?

A Round-robin

B Priority queue

C Least connections

D Random

Node.js cluster uses round-robin to distribute connections evenly among workers.

Why should you use multiple workers in a Node.js app?

A To avoid using the event loop

B To reduce memory usage

C To simplify code

D To use multiple CPU cores and handle more requests

Multiple workers allow Node.js to use multiple CPU cores, improving performance.

What does the master process do if a worker crashes?

A Spawns a new worker to replace it

B Does nothing

C Restarts the entire server

D Logs an error and stops

The master process can detect worker crashes and create new workers to keep the app running.

Which of these is NOT a benefit of load balancing between workers?

A Improved app responsiveness

B Better CPU usage

C Single point of failure

D Higher reliability

Load balancing reduces single points of failure by spreading work across workers.

Explain how the Node.js cluster module helps with load balancing between workers.

Think about how Node.js handles multiple requests using workers.

Describe what happens when a worker process crashes in a Node.js cluster setup and how the system recovers.

Consider fault tolerance and worker lifecycle.