https://github.com/semusings/stock-exchange

Stock Exchange
https://github.com/semusings/stock-exchange

Last synced: 3 days ago
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Stock Exchange

• Host: GitHub
• URL: https://github.com/semusings/stock-exchange
• Owner: semusings
• Created: 2024-06-19T10:36:19.000Z (5 months ago)
• Default Branch: main
• Last Pushed: 2024-06-19T23:11:55.000Z (5 months ago)
• Last Synced: 2024-06-20T22:53:03.538Z (5 months ago)
• Language: Java
• Homepage: https://semusings.github.io/stock-exchange/
• Size: 57.6 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
---

marp: true

theme: your-theme

paginate: true

header: '© Software Engineering Musings -  - subscribe us on '

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## System Design : Stock Exchange

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## Step 1—Design Scope

- Q: supported securities: _stocks_

- Q: business functions: 

  - _placing a new order_ 

  - _canceling an order_

- Q: supports trading after normal hours: _no_

- Q: business scale requirements:

    - how many users: _at least ten of thousands of users trading concurrently_

    - how many symbols: _at least 100 symbols_

    - how many orders: _billions of orders per day_

- Q: risk checks or constraints:

    - _user can only trade a maximum of 1 million shares per day for a single symbol_

- non-functional requirements:

    - availability: _99.99%_

    - fault tolerance:

        - _no data loss and fast recovery mechanisms are needed to limit the impact of a production incident_

    - latency:

        - _round-trip latency should be at the millisecond level; focus on low 99th percentile latency_

        - _round-trip latency measured from the moment a market order enters the exchange to the point where the market order

          returns as filled execution_

    - security:

        - _should have an account management system and do KYC check to verify a user's before a new account is opened_

        - _prevent distributed denial of service (DDoS) attacks on public page containing market data_

- back-of-the-envelope calculations:

    - _100 symbols_

    - _1 billion orders per day_

    - _the stock exchange operates for 6.5 hours per day (9:30 am to 4:00 pm) Monday to Friday_

    - _QPS = 1 billion orders / (6.5 hours * 3600 seconds) =~ 50,000 orders per second_

    - _peak QPS = 5 * QPS = 250,000 orders per second; trading volume is usually 5 times higher at the opening and

      closing hours_

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## Step 2—High-Level Design