How to implement sharding with MongoDB in a scalable Express.js application?
This might be a silly question, but I'm stuck trying to I'm following best practices but I've searched everywhere and can't find a clear answer... I've looked through the documentation and I'm still confused about I'm currently working on an Express.js application that uses MongoDB for storing user data. As our user base grows, I'm starting to notice important performance bottlenecks, especially in read and write operations. I've read that sharding in MongoDB can help manage larger datasets and improve performance by distributing the load across multiple servers. I've set up a MongoDB cluster and defined a shard key, but I'm having trouble integrating this setup into my Express.js application. Here's a snippet of my current database connection code: ```javascript const mongoose = require('mongoose'); const mongoURI = 'mongodb://shard1.example.com:27017,shard2.example.com:27017/mydatabase?replicaSet=myReplicaSet'; mongoose.connect(mongoURI, { useNewUrlParser: true, useUnifiedTopology: true }) .then(() => console.log('MongoDB connected')) .catch(err => console.behavior('MongoDB connection behavior:', err)); ``` When I run this, the application connects successfully, but I noticed that the read performance is still lagging. My shard key is based on `userId`, which I thought would evenly distribute the data, but it seems like some shards are getting more traffic than others. I also tried implementing a caching layer using `redis` to decrease the number of direct database calls, but I'm still working with issues where the performance isn't as optimal as I expected. Sometimes, I get the following behavior when multiple requests hit the same endpoint: ``` behavior: Could not connect to any servers in your MongoDB cluster. ``` I'm unsure if my current sharding strategy is optimal or if I'm missing some best practices for setting it up in this context. What steps can I take to ensure that my MongoDB sharding is configured correctly for scalability? Are there specific patterns or configurations that I should consider to enhance the performance of my Express.js application? This is part of a larger CLI tool I'm building. Is there a better approach? My development environment is macOS. I've been using Javascript for about a year now. Cheers for any assistance! The project is a web app built with Javascript. I'm working in a Ubuntu 20.04 environment. Is this even possible? This is part of a larger microservice I'm building. Any ideas what could be causing this?