Distributed Key-Value Store

Design a distributed key-value store that can store and retrieve data across multiple nodes in a network. The system should be fault-tolerant and scalable, allowing for the addition of new nodes without downtime. The system should also provide a consistent interface for clients to interact with the data.

Example:

Suppose we have a system that needs to store user information, including name, email address, and password. The system must be able to handle 10 million users and provide high availability and low latency.

Functional Requirements:

• The system should be able to store and retrieve data using a key-value interface.
• The system should be able to scale horizontally by adding new nodes to the network.
• The system should provide fault tolerance, ensuring that data is not lost if a node fails.
• The system should provide a consistent interface for clients to interact with the data.

Non-functional Requirements:

• The system should provide high availability with 99.99% uptime.
• The system should provide low latency with a response time of less than 10 milliseconds.
• The system should be able to handle 10,000 requests per second with a throughput of at least 10,000 operations per second.
• The system should be secure and protect user data from unauthorized access.
• The system should be easy to deploy, configure, and maintain.

Assumptions:

• The system assumes that each node in the network is connected to each other and can communicate with each other.
• The system assumes that each node has access to a shared storage or database.
• The system assumes that the network has a reliable messaging protocol to communicate between nodes.

Estimated Usage:

• The system is designed to handle 10 million users and data items.
• The system is designed to handle a high volume of read and write requests with 10,000 requests per second and a throughput of at least 10,000 operations per second.