Part1 Video: https://youtu.be/Q8SUqC5uha4 Part2 Video: https://youtu.be/LAqWmArmkiI Plagued by inaccurate estimates and expectations, pre-planning IT resources is often unexpectedly hard, especially for start-ups. If you don’t have the ability to peer into the future, what you should do? As your IT stack expands, how to avoid getting trapped in operational nightmares? With limited resources, how can you cut the cost of your infrastructure to a fraction and spend the money on other important stuff? In this session, Xiaohu would like to share how you can take advantages of the latest development in distributed systems to set up a light, scalable and frugal tech stack for your start-up. Xiaohu aims not only to introduce something new and useful to your toolbox but also to establish the kind of mindset you need to get the most out of these new tools. 由于很难对未来给出准确的估计和预期，提前规划IT资源，尤其是对start-up来说，往往是一个不切实际的奢望。既然不能预知未来，那我们应该如何应对？随着IT栈规模扩张，如何避免被膨胀的运维需求压垮？在资源有限的情况下，如何大幅减低IT基础设施费用并把钱花在刀刃上？ 本期活动中，Xiaohu将会和你分享分布式系统的的一些新的进展，以及如何如何利用它们为你的start-up构建一个轻量级，可扩展而且节俭的技术栈。我们不仅希望能让你收获一些趁手的新工具，也将探讨一些新的设计理念使这些工具带来的收益最大化。 Speaker： Xiaohu Xie McGill University Computer Science Ph.D. Creator of antgora.com, which aims to provide an online platform for small business owners and local service providers. Xiaohu has years of work experience from IBM and Amazon. He has rich experience in both frontend (ES6, html5, Responsive design, React.js, Webpack, etc.) and backend (cloud computing, distributed systems, databases design, serverless architecture, big data technologies, etc.). He is also a true believer of the entrepreneurial spirit which he thinks is the engine of progress in modern society. Xiaohu Xie, McGill大学计算机博士。有多年IBM和Amazon工作经验。创建了antgora.com希望为小商家和本地服务提供商提供一个在线平台。有丰富前端和后端开发经验。企业家精神的信徒，认为企业家精神是现代社会进步的发动机。

1. Setting Up A Modern Tech
Stack For Your IT Startup
Techniques & Mindsets

2. Who Am I
 Ph.D. in CS, McGill University
 Years of work exp. from IBM and Amazon
 Creator of antgora.com
 Interested & experienced in
 Cloud Computing
 Web Dev
 Big Data
 ML and AI
 linkedin.com/in/xiaohu-xie/
 Weixin ID: Xiaohu-Xie

3. Topics
 Light, Scalable and Frugal
 Go Stateless
 Go NoSQL
 Go Serverless
 Infrastructure as Code
 Testing vs. Monitoring
I
II

4. Negative Example
 2018 real case
 A big company outsources a website and an APP.
 Project requirements:
 One web server, with 300 GB disk space; Projected
storage capacity growth 100G/year.
 One mobile server, same spec.
 One Oracle database server.
 Light, scalable, frugal, available, …

5. Go Stateless
 Cluster of low-end servers, load balancer, across-DC
 Stateless
 Highly available
 Operational sustainable
 Scalable
 Frugal

6. Go NoSQL
 SQL: optimized for storage
Relational Database
Users
User ID,
Name, …
Ownership
User ID,
Business ID
Businesses
Business ID,
Bus. Name,..
1 * 1
1

7. Go NoSQL
 NoSql: Optimized for CPU instead of storage
 Cross-table update can be done via Lambda
 Scalable, responsive, sustainable
 Your design should tolerant eventual consistency
NoSql Database
User
User ID, Name,
Businesses: {
ID1: Bus. Name,
ID2: Bus. Name
} , …
Business
Business ID,
Bus. Name,
Owner ID, …

8. Go Serverless
 Serverless computing: Lambda can do a lot more

9. Go Serverless
 Serverless application: Now that we have stateless
servers and Lambda

10. Infrastructure as Code

11. Infrastructure as Code

12. Testing & Monitoring
 Tests are important!

13. Testing & Monitoring
 Unit Tests, Integration Tests, Smoke Test …
 But tests cannot catch everything.
 Infrastructure & runtime issues, e.g., servers/database
disconnected, DNS misconfiguration, cache failures.

14. Testing & Monitoring
 Monitoring
 Monitor errors/latency/call volume in Prod.
 Alarm when abnormality detected

15. Canary Test
 You should run when the canary stops chirping.
Dev
Prod
Monitoring

16. Thank You!
Questions?
Bias for action