Node.js - Cluster Module
You want to create a cluster that automatically restarts a worker if it crashes. Which approach correctly implements this behavior?
You want to create a cluster that automatically restarts a worker if it crashes. Which approach correctly implements this behavior?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand worker crash handling
The primary process can listen to the 'exit' event when a worker dies.Step 2: Restart worker on exit
Inside the 'exit' event handler, calling cluster.fork() creates a new worker to replace the crashed one.Final Answer:
Listen to the 'exit' event on cluster and fork a new worker inside the handler -> Option AQuick Check:
Restart crashed workers by handling 'exit' event [OK]
Quick Trick: Use 'exit' event to restart workers automatically [OK]
Common Mistakes:
- Forking workers repeatedly with setInterval causes overload
- Not restarting workers after crash leads to downtime
- Using cluster.disconnect() inside worker does not restart it
Master "Cluster Module" in Node.js
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