Leader Election

Single leader with automatic failover.

When to Use This Skill

• Multiple instances, only one should run cron jobs
• Singleton queue consumers
• Coordinating distributed workers
• Need automatic failover when leader dies

Core Concepts

1. Heartbeat - Leader sends periodic heartbeats
2. Timeout - If heartbeat stops, leader is dead
3. Term - Monotonic counter prevents split-brain
4. Failover - Followers compete to become new leader

TypeScript Implementation