Lesson 4 · Chapter III
System DesignSystem Design Opening
設計題開場 — 釐清規模、流量、一致性需求、寫 / 讀 比例。
📜 Dialogue · 對話腳本
Interview & Job Hunt
A
Design a URL shortener like bit.ly.
設計一個像 bit.ly 的短網址服務。
Y
Before I jump in — how many URLs per day are we shortening?
我開始前 — 每天縮幾個網址?
A
Around 100 million per day.
大約一天一億。
Y
OK, and read-to-write ratio? I assume read-heavy.
好。讀寫比?我猜讀比較多。
A
Yes, about 100 to 1.
對,約 100 比 1。
📝 Key Phrases · 重點片語
6 expressions to remember
before I jump in
我開始前
URL shortener
短網址服務
per day
每天
read-to-write ratio
讀寫比
read-heavy
讀比較多
around X million
大約 X 百萬