Distributed Locking

Prevent race conditions across multiple instances.

When to Use This Skill

• Multiple instances processing the same job
• Need to prevent duplicate operations
• Singleton cron jobs across instances
• Critical sections in distributed systems

Core Concepts

1. Atomic acquisition - Only one holder at a time
2. TTL expiration - Prevents deadlocks if holder crashes
3. Lock extension - Renew for long-running operations
4. Holder ID - Track who owns the lock

TypeScript Implementation