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Causal Consistency Explained for System Design Interviews
Last Updated: January 5, 2026
Ashish Pratap Singh
11 min read
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Causal Consistency Explained for System Design Int...
1. What is Causal Consistency?
1.1 The Core Idea
1.2 Why Causal Consistency Matters
1.3 Formal Definition
2. The Happens-Before Relationship
2.1 Defining Happens-Before
2.2 Visualizing Happens-Before
2.3 Concurrent Operations
2.4 Causal History
3. Causal Consistency vs Other Models
3.1 The Consistency Spectrum
3.2 Causal vs Eventual Consistency
3.3 Causal vs Sequential Consistency
3.4 Causal vs Linearizability
3.5 Summary Comparison
4. Implementing Causal Consistency
4.1 Lamport Timestamps
4.2 Vector Clocks
4.3 Version Vectors
4.4 Dotted Version Vectors
4.5 Causal Delivery
5. Conflict Resolution in Causal Systems
5.1 Types of Conflicts
5.2 Last-Writer-Wins (LWW)
5.3 Multi-Value (Siblings)
5.4 CRDTs (Conflict-free Replicated Data Types)...
6. Real-World Systems Using Causal Consistency...
6.1 MongoDB
6.2 Cassandra with Lightweight Transactions
6.3 DynamoDB
6.4 Riak
6.5 Comparison
7. When to Use Causal Consistency
7.1 Decision Framework
7.2 Good Use Cases for Causal Consistency
7.3 When NOT to Use Causal Consistency
7.4 Cost-Benefit Analysis
8. Common Interview Questions
8.1 Conceptual Questions
8.2 Design Questions
8.3 Quick Reference
Summary
References
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Course Introduction
