Queue worker supervision in Laravel - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What happens when a Laravel queue worker is stopped manually?

Consider a Laravel queue worker running with php artisan queue:work. What is the behavior when you press CTRL+C to stop it?

A The worker queues all remaining jobs to a failed jobs table before stopping.

B The worker immediately stops, abandoning any job in progress.

C The worker finishes processing the current job before stopping.

D The worker restarts automatically after stopping.

💡 Hint

Think about graceful shutdown and job completion.

When you stop a Laravel queue worker manually, it finishes the current job before stopping to avoid losing work.

📝 Syntax

intermediate

Which command supervises queue workers with automatic restart on failure?

Choose the correct Laravel command to start a queue worker that automatically restarts if it fails.

A php artisan queue:work --once

B php artisan queue:listen

C php artisan queue:work --daemon

D php artisan queue:work --supervised

💡 Hint

One command listens continuously and restarts workers automatically.

queue:work --supervised runs the worker and restarts it automatically on failure, providing supervision.

🔧 Debug

advanced

Why does a Laravel queue worker stop unexpectedly without restarting?

A Laravel queue worker started with php artisan queue:work --daemon stops unexpectedly after a job fails. What is the most likely cause?

Laravel

php artisan queue:work --daemon

A The worker does not restart automatically on failure when using --daemon.

B The queue connection is misconfigured causing the worker to crash.

C The worker is running out of memory and is killed by the OS.

D The failed job is not logged, so the worker stops silently.

💡 Hint

Consider how the --daemon flag affects worker supervision.

The --daemon flag runs the worker continuously but does not restart it automatically on failure. You must supervise it externally.

❓ state_output

advanced

What is the state of a Laravel queue worker after a job timeout?

If a job exceeds the timeout set in the queue worker configuration, what happens to the worker process?

A The worker kills the job and continues processing the next job.

B The worker process is terminated and does not restart automatically.

C The worker pauses and waits for manual restart.

D The worker marks the job as failed and restarts automatically.

💡 Hint

Think about how PHP handles timeouts and process termination.

When a job times out, the worker process is killed by PHP. Without external supervision, it will not restart automatically.

🧠 Conceptual

expert

How does Laravel Horizon improve queue worker supervision?

Which feature of Laravel Horizon provides enhanced supervision of queue workers compared to basic queue:work commands?

A It automatically restarts failed workers and provides a dashboard for monitoring.

B It runs workers only during off-peak hours to save resources.

C It disables job retries to prevent worker overload.

D It converts all jobs to synchronous execution for reliability.

💡 Hint

Think about monitoring and automatic recovery features.

Laravel Horizon supervises workers by restarting failed processes and offering a real-time dashboard to monitor job status and worker health.