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nestjs-scheduling

Implement distributed cron jobs with Redis-based locking and BullMQ offloading in NestJS. Use when adding @Cron scheduled tasks, preventing duplicate runs across pods, or delegating heavy work to queue workers.

The English summary is being prepared. Showing the original description.

Works withRedis

Run score Not tested

See how to install

Files included (3)

  • SKILL.md2.4 KB
  • evals/evals.json2.2 KB
  • references/example.md753 B

SKILL.md (original)

Review the instructions the agent will receive before you install.

Task Scheduling & Jobs

Priority: P1 (HIGH)

Workflow: Add Scheduled Task

  1. Register ScheduleModule — Import ScheduleModule.forRoot() in AppModule.
  2. Create cron handler — Decorate service method with @Cron(CronExpression.*).
  3. Add distributed lock — Apply Redis lock decorator to prevent multi-pod duplication.
  4. Offload heavy work — Push job IDs to BullMQ; let workers process them.
  5. Wrap in try/catch — Uncaught exceptions in cron handlers crash entire Node process.
  6. Verify — Test with 2+ instances to confirm only one acquires lock.

Problem & Solution

  • Problem: @Cron() runs on every instance. In K8s with 3 pods, your "Daily Report" runs 3 times.
  • Solution: Distributed Locking using Redis.
  • Pattern: Using decorator to wrap cron method.
  • Logic: SET resource_name my_random_value NX PX 30000 (Redis Atomic Set).

Cron Decorator Pattern

  • Implementation:

See implementation examples

  • Tools: Use nestjs-redlock or custom Redis wrapper via redlock library.

Cron-to-Queue Offload

See implementation examples

Job Robustness

  • Isolation: Never perform heavy processing inside Cron handler.
  • Pattern: Cron -> Push Job ID to Queue (BullMQ) -> Worker processes it.
  • Why: Cron schedulers can get blocked by Event Loop; Workers scalable.
  • Error Handling: Wrap ALL cron logic in try/catch. Uncaught exceptions in Cron job can crash entire Node process.

Anti-Patterns

  • No unguarded cron logic: Always wrap in try/catch; uncaught exceptions crash entire Node process.
  • No direct cron processing: Push to BullMQ queue; workers scalable, cron handlers not.
  • No bare @Cron in multi-pod: Use distributed locking (redlock) to prevent duplicate concurrent runs.

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • crash

Remediation anchors

  • Remediation anchors: BullMQ, event loop, worker

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