Deferring slow operations.
WHAT A QUEUE DOES
Accepts work now, performs it later, outside the request.
WHAT TO QUEUE
Sending mail Image and file processing External API calls Report generation Anything slow
WHY
A request should return quickly. Anything slow inside it degrades the experience and risks timeouts.
WHAT IS NEEDED
A queue driver, and a worker process consuming jobs.
WHAT DRIVERS EXIST
Database, which requires nothing additional Dedicated queue systems, for higher volume
WHAT SUITS SHARED HOSTING
The database driver, with a worker started by a scheduled task.
WHY NOT A PERSISTENT WORKER
Long-running processes are frequently restricted, and they consume resources continuously.
WHAT TO CONFIGURE
Retry behaviour A limit on attempts Handling of failed jobs
WHAT TO DO WITH FAILURES
Record them, and be able to inspect and retry.
WHAT TO MONITOR
Queue length, and whether the worker is running.
WHAT TO BE CAREFUL WITH
Jobs that are not safe to run twice.
