[Solved] Identify the error in this code snippet that tries to restart a worker after it crashes: const cluster = require('cluster'); if (cluster.isMaster) { cluster.fork(); cluster.... | Node.js

Node.js - Cluster Module

Identify the error in this code snippet that tries to restart a worker after it crashes:

const cluster = require('cluster');
if (cluster.isMaster) {
  cluster.fork();
  cluster.on('exit', (worker) => {
    console.log('Worker crashed, restarting...');
    cluster.fork();
  });
}

AThe 'exit' event should be listened on 'cluster' but the callback parameter should be (worker, code, signal)

BThe 'exit' event should be listened on 'cluster.workers', not 'cluster'

CThe 'exit' event should be listened on 'cluster' but the callback parameters are wrong

DThe 'exit' event callback parameters are incorrect; it should receive (code, signal)

Step-by-Step Solution

Solution:

Step 1: Check where to listen for worker exit
The 'exit' event is emitted by the cluster module, and the callback receives (worker, code, signal).
Step 2: Identify callback parameter mismatch
The code uses only one parameter (worker), but the event provides three parameters; this can cause confusion or errors.
Final Answer:
The 'exit' event should be listened on 'cluster' but the callback parameter should be (worker, code, signal) -> Option A
Quick Check:
cluster.on('exit', (worker, code, signal)) is correct [OK]

Quick Trick: cluster.on('exit') callback needs (worker, code, signal) parameters [OK]

Common Mistakes:

Listening on cluster.workers instead of cluster
Using wrong callback parameters
Ignoring code and signal parameters

Master "Cluster Module" in Node.js

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More Node.js Quizzes

Identify the error in this code snippet that tries to restart a worker after it crashes:

Step 1: Check where to listen for worker exit

Step 2: Identify callback parameter mismatch

Final Answer:

Quick Check:

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