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Last Write Wins: A Simple Yet Powerful Conflict Resolution Strategy
Last Updated: January 5, 2026
Ashish Pratap Singh
10 min read
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Last Write Wins: A Simple Yet Powerful Conflict Re...
The Problem: Concurrent Writes in Distributed Syst...
What is Last Write Wins?
How Last Write Wins Works
Scenario: Concurrent Profile Updates
Timestamp Strategies for LWW
1. Wall Clock Timestamps
2. Logical Clocks (Lamport Timestamps)
3. Hybrid Logical Clocks (HLC)
4. Server-Assigned Timestamps
Comparison Table
LWW Data Structures: Registers, Sets, and Maps...
LWW-Register
LWW-Element-Set
LWW-Map
Pros and Cons of Last Write Wins
Advantages
Disadvantages
Real-World Use Cases
1. Cassandra
2. DynamoDB
3. Riak
4. Redis (Cluster Mode)
5. Collaborative Applications
When to Use LWW (and When Not To)
Good Fit for LWW
Poor Fit for LWW
Alternatives to Last Write Wins
1. Application-Level Conflict Resolution
2. CRDTs (Conflict-free Replicated Data Types)...
3. Operational Transformation (OT)
4. Vector Clocks with Siblings
Comparison: When to Use What
Implementing LWW: A Simple Example
Summary
References
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Course Introduction
