Node.js - Cluster Module
You want to create a Node.js server that forks one worker per CPU core and restarts any worker if it crashes. Which code snippet correctly implements this behavior?
Aconst cluster = require('cluster');
const http = require('http');
const os = require('os');
if (cluster.isPrimary) {
const numCPUs = os.cpus().length;
for (let i = 0; i < numCPUs; i++) {
cluster.fork();
}
} else {
http.createServer((req, res) => {
res.writeHead(200);
res.end('Hello from worker ' + process.pid);
}).listen(8000);
cluster.on('exit', (worker) => {
console.log(`Worker ${worker.process.pid} died`);
});
}
Bconst cluster = require('cluster');
const http = require('http');
const os = require('os');
if (cluster.isWorker) {
const numCPUs = os.cpus().length;
for (let i = 0; i < numCPUs; i++) {
cluster.fork();
}
} else {
http.createServer((req, res) => {
res.writeHead(200);
res.end('Hello from worker ' + process.pid);
}).listen(8000);
}
Cconst cluster = require('cluster');
const http = require('http');
const os = require('os');
if (cluster.isPrimary) {
const numCPUs = os.cpus().length;
for (let i = 0; i < numCPUs; i++) {
cluster.fork();
}
cluster.on('exit', (worker) => {
console.log(`Worker ${worker.process.pid} died, restarting...`);
cluster.fork();
});
} else {
http.createServer((req, res) => {
res.writeHead(200);
res.end('Hello from worker ' + process.pid);
}).listen(8000);
}
Dconst cluster = require('cluster');
const http = require('http');
const os = require('os');
if (cluster.isPrimary) {
cluster.fork();
} else {
http.createServer((req, res) => {
res.writeHead(200);
res.end('Hello from worker ' + process.pid);
}).listen(8000);
}