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Pascual Vila

Frontend Instructor // Code Syllabus

Common Pitfalls & Errors

The Error //

Processing background jobs inline within the same process handling HTTP requests

// Risky: shares the event loop with HTTP request handling
app.use(async (req, res, next) => { await processQueuedJob(); next(); });

// Correct: a completely separate worker process
// worker.js — deployed and scaled independently of the web server

The Solution //

Job processing and HTTP request handling have fundamentally different resource profiles, but sharing the same process means they compete for the same event loop and resource limits — a burst of resource-intensive job work can directly degrade the responsiveness of unrelated HTTP requests being served by that same process at the same time. Deploy workers as a separate process from the web server.

The Error //

Running fundamentally different job types (fast/frequent and slow/rare) through the same shared queue and worker pool

// Wrong: a burst of slow report jobs starves fast notification jobs
queue.add("sendNotification", data);
queue.add("generateAnnualReport", data); // same queue, competes for the same workers

// Correct: isolated, independently-sized queues
notificationQueue.add("sendNotification", data);
reportQueue.add("generateAnnualReport", data);

The Solution //

A burst of slow, rare jobs can consume all available worker concurrency, delaying fast, time-sensitive jobs that happen to be waiting behind them in the same queue — even though the fast jobs would normally process almost instantly on their own. Use separate queues (and separately-sized worker pools) for job types with meaningfully different performance characteristics.