Run reliable background jobs with BullMQ

domain: bullmq · 4 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed

Verified steps

Queue.add with jobId for idempotent enqueues (duplicates with same id are dropped)
Worker with concurrency + limiter; export removeOnComplete/removeOnFail policies
Handle stalled jobs: maxStalledCount, and make handlers idempotent
Use QueueEvents for completion tracking; separate Redis connection per Worker/Queue

Known gotchas

Workers that block the Node event loop get their jobs marked stalled and re-run — CPU work needs sandboxed processors
Without removeOnComplete Redis fills with finished-job data until OOM
Reusing one ioredis connection across Queue and Worker breaks blocking commands — BullMQ needs dedicated connections

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