Build a Crash-Consistent Single-Server Key-Value Store
Last updated: July 26, 2026
Quick Overview
Design a crash-consistent single-server key-value store that ensures data integrity and durability in the event of a crash.
Baseten
July 26, 20269
0
114 solved
Design a crash-consistent single-server key-value store that ensures data integrity and durability in the event of a crash.
This question is typically asked during the technical screening round to assess a candidate's understanding of data storage systems and their ability to design robust software solutions. The interviewer is evaluating the candidate's knowledge of consistency models, data durability techniques, and their approach to handling system failures.
What the Interviewer Expects
- Explain the concept of crash consistency and why it is important.
- Discuss the design choices for data storage and retrieval.
- Describe the mechanisms for ensuring durability and integrity.
- Provide a high-level architecture of the key-value store.
- Address potential trade-offs in performance and complexity.
Key Topics to Cover
How to Approach This
- Apply SOLID principles. Single Responsibility makes code testable, Open/Closed makes it extensible.
- Choose data structures based on access patterns, not familiarity.
- Prefer immutable data and message passing over shared mutable state for concurrency.
- Design APIs with RESTful conventions, versioning, meaningful errors, and pagination from day one.
Possible Follow-up Questions
- How would you handle concurrent access to the key-value store?
- What strategies would you use to recover from a crash?
- Can you explain how you would implement data replication?
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Practice System Design ProblemsSample Answer
Requirements
To build a crash-consistent single-server key-value store, we need to ensure that all operations are atomic and durable. This means that once a write operation is acknowledged, it should survive any s...
High-Level Design
The architecture of the key-value store consists of a storage engine that handles data persistence and a memory cache for fast access. The storage engine will use a write-ahead log (WAL) to record cha...
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