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Lease Mechanisms in Distributed Systems
Last Updated: January 5, 2026
Ashish Pratap Singh
10 min read
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Lease Mechanisms in Distributed Systems
What is a Lease?
Why Do Distributed Systems Need Leases?
The Failure Detection Problem
The Mutual Exclusion Problem
The Cache Consistency Problem
How Leases Work
Lease Acquisition
Lease Renewal
Lease Expiration
The Clock Skew Problem
How Clock Skew Breaks Leases
Solutions to Clock Skew
Fencing Tokens
How Fencing Works
Implementing Fencing
Fencing Token Scope
Real-World Implementations
Google Chubby
Apache ZooKeeper
etcd Leases
DynamoDB Leases
Use Cases for Leases
Leader Election
Distributed Locks
Cache Invalidation
Service Health and Registration
Best Practices
Choose Appropriate Lease Duration
Always Use Fencing Tokens
Handle Lease Loss Gracefully
Build in Safety Margins
Monitor Lease Metrics
Lease Duration vs. Failure Detection Time
Summary
References
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Course Introduction
