Node js

Jan 27, 2017Download as PPTX, PDF4 likes1,730 views

This document provides an overview of Node.js, including: - Node.js is an open source, cross-platform JavaScript runtime environment built on Chrome's V8 engine. It has a large developer community. - Several major companies like Yahoo, Netflix, and LinkedIn use Node.js and have seen significant improvements in performance and scalability compared to other platforms. - Node.js uses an event-driven, non-blocking I/O model that can handle thousands of concurrent connections with minimal resources. This makes it well-suited for I/O-intensive applications. - Common Node.js tools and frameworks discussed include NPM, Express, Mongoose, and Socket.io. Examples are

21.02.2017
Fatih Şimşek - Software Infrastructure

NodeJs
Open Source, cross platform
Huge community
Ryan Dahl, Joyent
Developed in 2009
Published in 2011 ( Linux + Windows )
Similar design to systems like Ruby's Event Machine or
Python's Twisted

Success Stories
Yahoo: Node services handle around 1.680.000 – 2.000.000
requests/minute. Biggest Win: speed & ease of developement
Netflix: The team decided to use Node.js to achieve lightweight,
modular and fast application. As a result, the startup time of
their new app has been reduced by 70%
Linkedin: When compared with the previous Ruby on Rails
based version, the new mobile app is up to 20 times faster
Walmart: %55 of all traffic on Black Friday went to Node
servers. Not a single Node server went down

Success Stories
PayPal: Build a Node version of a Java app in half the time with
fewer developers. Node version of the app doubled the number
of requests/second. Request time dropped 35%
Groupon: In comparison with earlier Ruby on Rails platform,
web pages got faster by about 50% and are able to serve much
higher traffic
GoDaddy: 10x fewer servers to host our customer websites and
we reduced the Time To First Byte (TTFB) considerably from
~60ms to something around ~12ms

NodeJs
Built on Chrome’s Javascript Runtime (V8)
Single thread, event oriented
Event-Driven with Non-blocking I/O
Use a Event Loop for Non-blocking I/O
Can handle thousands of concurrent connections with minimal
overhead (CPU/Memory)
40% JS and 60% C++

Traditional Server
New thread per request
The thread is blocked
during IO operations

Thesis
IO is expensive
Thread per connection
is memory expensive

Architecture
Client
Event loop
(main thread)
C++
Threadpool
(worker
threads)
Clients send HTTP requests
to Node.js server
An Event-loop is woken up by OS,
passes request and response objects
to the thread-pool
Long-running jobs run
on worker threads
Response is sent
back to main thread
via callback
Event loop returns
result to client

Architecture
API in Javascript
Relies on Google’s V8
runtime engine
Node Bindings allow for
server operations (IO,
network)
Libuv responsible for both
asynchronous I/O & event
loop

When to use NodeJs?
Highly Event driven & Heavily I/O bound
Chat application
Online game
Collaboration tool
Monitoring Dashboard
Trader’s Dashboard

When not to use NodeJs?
Heavy CPU intensive calculations on server-side
Concurrent Task based applications

Install
https://nodejs.org/en/download/
node –v (Node version)

Developement Environment
Web Storm
Sublime Text
Atom
Nodeclipse
Visual Studio
Visual Studio Code

Node Frameworks & Tools
NPM (Package Manager)
Gulp / Grunt
Express.js
Frameworks built on Express.js (LoopBack / MEAN / Sails)
Restify
Mongoose
Socket.io

NPM
Package manager for Node
Bundled and installed automatically with the environment
Frequently Usage
• npm install --save package_name
• npm update
How Does it works?
• Read package.json
• Installs the dependencies in the local node_modules folder
• In global modes, it make a node module accessible to all

Express.js
Web application framework
Minimal and Flexible
Many Framework based on Express
Features
• MVC
• Routing
• Session Support
• Cookie Parsing
• Middleware (Request-Response Cycle)
• View Engines (Jade, Ejs, Vash)

Vash
Familiar Razor engine experience
No special template syntax to learn
Syntax:

Mongoose
Object Data Modelling for Node.js
Officially supported by 10gen,Inc
Features:
• Async and sync validation of models
• Model casting
• Object lifecycle management (hook save / validate)
• Query Builder
• Schema Deriven Design

EventEmitter
Most of built-in Node libraries use it
Use Observer Pattern

Socket.io
Realtime application framework
Cross browser (Web socket + fallback)
Bi-directional communication
Automatic compression
IOS, Android, NativeScript support
Two parts
• Client side (run on browser)
• Server side (run on Node)

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If we were building a GenAI stack today, we'd start with one question: Can your retrieval system handle multi-hop logic? Trick question, b/c most can’t. They treat retrieval as nearest-neighbor search. Today, we discussed scaling #GraphRAG at AWS DevOps Day, and the takeaway is clear: VectorRAG is naive, lacks domain awareness, and can’t handle full dataset retrieval. GraphRAG builds a knowledge graph from source documents, allowing for a deeper understanding of the data + higher accuracy.

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Societal challenges of AI: biases, multilinguism and sustainabilityJordi Cabot