System Design Interview Crash Course
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Design a Key-Value Store (like DynamoDB)

Here is the step-by-step design for a distributed Key-Value Store, similar to Amazon DynamoDB or Apache Cassandra.

1. Problem Definition and Scope

We are designing a distributed Key-Value (KV) store. This is a NoSQL database that allows applications to store data as a collection of key-value pairs, where the key is a unique identifier and the value is opaque binary data (the system does not need to understand the content).

  • Main User Groups:
    • Application Developers: They use the KV store as the backend for microservices (e.g

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