High Level Design Diagram

Components of the distributed k-v store

• etcd Installation
• Single-Node Cluster Setup Guide
• Write functions to List all keys using etcd client library.
• Get the value for a specific key provided by the user.
• Put a key-value pair into etcd, allowing users to specify both key and value.

This guide provides a comprehensive overview of installing etcd, configuring your system to run it, and setting up a single-node etcd cluster on a Linux system.

To download a specific version of etcd from the official GitHub repository:

1. Identify the version you want to download from etcd releases.
2. Use the following commands to download and extract etcd to a temporary location:

ETCD_VER=<version> # Example: v3.4.31
DOWNLOAD_URL=https://github.com/etcd-io/etcd/releases/download
curl -L ${DOWNLOAD_URL}/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz -o /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz
tar xzvf /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz -C /tmp/etcd-download-test --strip-components=1

This is how it should appear by the end of installation:

After downloading and extracting etcd, you may encounter a message indicating etcd command is not found. This is because the binary is not in your system's PATH. To resolve this:

1. Move etcd and etcdctl to a more permanent location, /usr/local/bin:

sudo mv /tmp/etcd-download-test/etcd /usr/local/bin/
sudo mv /tmp/etcd-download-test/etcdctl /usr/local/bin/

For bash users, add /usr/local/bin to your PATH by editing ~/.bashrc:

echo 'export PATH="/usr/local/bin:$PATH"' >> ~/.bashrc
source ~/.bashrc

For zsh users, modify ~/.zshrc instead:

echo 'export PATH="/usr/local/bin:$PATH"' >> ~/.zshrc
source ~/.zshrc

Follow the steps outlined in the etcd documentation for setting up a single-node cluster:

1. Start the etcd server:

etcd

2. Interact with etcd using etcdctl:

etcdctl put mykey myvalue
etcdctl get mykey

Getting and Setting K-V pair in local system:

For detailed instructions, refer to the etcd Quickstart Guide.

To run the script.py file and interact with the etcd cluster, perform the following steps:

• Ensure the etcd service is running.
• Install the etcd3 Python package if not already installed:

  pip install etcd3

If you encounter errors related to the protobuf library, downgrade the protobuf package to version 3.20.x or lower:

pip install protobuf==3.20.0

or you can set the protocol buffers env. variable:

set PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python

• Run script.py

python script.py

Output:

• Write function to delete keys.
• Write function to implement range scan.
• Error handling for the functions
• Design a CLI.

Run script.py

python script.py

CLI:

• Write unit tests for program's functionalities
• Multi-Node cluster set up

Run script.py

python script.py

Running Unit Tests

Multi Node Cluster Setup Running.

Multi Node Cluster Before Deleting Leader.

Multi Node Cluster After Deleting Leader.

• This guide focuses on development and testing environments. For production setups, consult the official etcd documentation for security, clustering, and configuration best practices.