Redis vs MongoDB Caching Benchmark

This project demonstrates and benchmarks the performance difference between fetching data directly from MongoDB versus using Redis as a caching layer. It includes a Node.js/Express application and scripts to run load tests using autocannon.

Prerequisites

Ensure you have the following installed and running on your machine:

• Node.js (v14 or higher)
• MongoDB (Default port: 27017)
• Redis (Default port: 6379)

If you don't have MongoDB or Redis installed locally, run them via Docker:

docker run -d --name mongo -p 27017:27017 mongo
docker run -d --name redis -p 6379:6379 redis

Setup

1. Clone the repository:

    git clone https://github.com/Ismail-047/redis.git
    cd redis

2. Install dependencies:

    npm install

3. Configure Environment Variables: Create a .env file in the root directory by copying the sample file:

    cp .env.sample .env

4. Seed the Database: Import the sample product data into MongoDB before starting the application:

    mongoimport --uri "mongodb://localhost:27017/redis-cache" --collection products --file products.json --jsonArray

If using Docker, copy the file into the container first:

    docker cp products.json mongo:/products.json
    docker exec mongo mongoimport --uri "mongodb://localhost:27017/redis-cache" --collection products --file /products.json --jsonArray

Running the Application

Start the development server:

npm run dev

The server will start on http://localhost:3000.

Benchmarking

This project includes two benchmark scripts to compare performance. Make sure the server is running in a separate terminal before executing these scripts.

1. Benchmark with Redis Caching

Run the benchmark that requests the endpoint using Redis for caching:

node src/benchmark-with-redis.js

2. Benchmark without Redis

Run the benchmark that requests the endpoint fetching directly from MongoDB every time:

node src/benchmark-without-redis.js

Benchmark Results

For a detailed performance comparison including latency metrics, and throughput analysis see:

📊 Redis Comparison Results.pdf

Project Structure

• src/index.js: Main application entry point, sets up Express, connects to DBs.
• src/benchmark-with-redis.js: Autocannon script testing the Redis-cached route.
• src/benchmark-without-redis.js: Autocannon script testing the direct MongoDB route.
• src/lib/redis.js: Redis client configuration.
• src/db/db.js: MongoDB connection setup.
• products.json: Sample product data for seeding the database.
• 1. Redis Comparison Results.pdf: Detailed benchmark comparison report.