How to use worker threads?

We need to offload a CPU‑intensive image resize operation. How would you set up a Worker thread in Node.js to handle a single image file?

If you spawn a Worker and forget to call worker.terminate(), what will happen when the main process exits?

Your new feature processes user‑uploaded CSV files in parallel using Worker threads, but you notice occasional 'ERR_WORKER_NOT_RUNNING' errors. Walk me through how you'd debug this.

When deciding between a Worker thread pool and spawning a new Worker per request, what trade‑offs would you consider for a service handling 200 requests per second?

Explain how you would pass large JSON data to a Worker without copying it unnecessarily.

Our microservice uses Worker threads for heavy calculations, but under load memory usage spikes. How would you redesign the threading model to keep memory bounded?

Design a strategy to gracefully shut down a Node.js server that has multiple active Workers processing jobs, ensuring no data loss.

What are the implications of using SharedArrayBuffer vs message passing for coordinating state between Workers in a high‑throughput system?

We plan to migrate a legacy monolith that currently uses child_process for parallel work to Worker threads across several teams. What architectural considerations and migration steps would you propose?

How would you evaluate whether introducing Worker threads at the platform level is worth the operational complexity compared to moving compute‑heavy parts to a separate service written in another language?

Discuss the long‑term maintenance challenges of a codebase that heavily relies on Worker threads for concurrency, especially regarding debugging, monitoring, and onboarding new engineers.