Design a Distributed Key-Value Store
What is a Key-Value Store?
A key-value store is a type of non-relational database that stores data as a collection of key-value pairs. Each unique key maps to a single value, and the store provides fast retrieval based on the key.
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The simplicity of this data model makes key-value stores extremely efficient for read and write operations. They are widely used as caching layers, session stores, and the backbone of distributed systems.
Popular Examples: Redis, Amazon DynamoDB
This problem is a common choice in system design interviews because it tests your understanding of distributed systems fundamentals: partitioning, replication, consistency, and failure handling.
In this chapter, we will explore the high-level design of a distributed key-value store.
Lets start by clarifying the requirements: