Event Loop & StreamsBeginner
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javascriptHow does the Node.js Event Loop architecture and Streams handle high-concurrency I/O?
Explanation & Concept
Node.js runs on the Google V8 engine backed by **libuv**, a C library that provides an event loop and thread pool.
Non-blocking I/O delegates network sockets and file operations to OS asynchronous mechanisms (epoll, kqueue). **Streams** process data chunk-by-chunk in memory buffers, allowing gigabyte files to be processed without memory exhaustion.
Code Example
javascript
import http from "node:http";
import fs from "node:fs";
const server = http.createServer((req, res) => {
// Efficiently pipe large file directly to HTTP response stream
const readStream = fs.createReadStream("./large_archive.mp4");
res.writeHead(200, { "Content-Type": "video/mp4" });
readStream.pipe(res); // Handles backpressure automatically!
});
server.listen(3000, () => console.log("Stream server on port 3000"));How It Works & Key Takeaways
`readStream.pipe(res)` reads in small 64KB chunks and handles backpressure: if the client's network is slow, Node pauses the disk stream to prevent RAM saturation.
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