Node.js · Theory

cluster.setupPrimary([settings]) in Node.js

Theory

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cluster.setupPrimary([settings]) in Node.js

cluster.setupPrimary([settings]) (node js) is a Node.js topic. In plain words you use it for use all CPU cores in production box. Don’t start with a slogan — start with that picture.

Smallest example: cluster.fork or PM2. Type it, run it, and say what you see. If you can do that from memory, you know cluster.setupPrimary([settings]) (node js).

From the example next to this theory: cluster.setupPrimary([settings]) in Node.js: find user 2, then list names. Say both prints..

Trap — in-memory session without sticky. Fix that before you talk about advanced Node.js.

Viva — what is cluster.setupPrimary([settings]) (node js)? Then show cluster.fork or PM2. Then name the trap.

Exam tip

What is cluster.setupPrimary([settings]) (node js)? Show this: cluster.fork or PM2. Trap: in-memory session without sticky.

Example

// cluster.setupPrimary([settings]) in Node.js
const users = [
  { id: 1, name: "Asha" },
  { id: 2, name: "Ravi" },
];

function findUser(id) {
  return users.find((u) => u.id === id) ?? null;
}

console.log(findUser(2));
console.log(users.map((u) => u.name));

cluster.setupPrimary([settings]) in Node.js: find user 2, then list names. Say both prints.

Short notes

Defcluster.setupPrimary([settings]) (node js) — use all CPU cores in production box.
Rulecluster.fork or PM2
Trapin-memory session without sticky
Useproduction box

// cluster.setupPrimary([settings]) in Node.js const users = [ { id: 1, name: "Asha" }, { id: 2, name: "Ravi" }, ]; function findUser(id) { return users.find((u) => u.id === id) ?? null; } console.log(findUser(2)); console.log(users.map((u) => u.name));

cluster.setupPrimary([settings]) in Node.js

Example

Short notes

Questions

cluster.setupPrimary([settings]) in Node.js

Example

Short notes

Questions