Grokking the System Design Interview, Volume II
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Step 6: Detailed Component Design

At noon, Maya presses the purchase button for Product X, a pair of headphones with 1,000 units in stock. In the same second, 50,000 other people press it too. Only 1,000 of them can get a pair, nobody may get two, and no pair may sit unsold because someone reserved it and walked away.

Maya's purchase raises five questions, and each section below answers one:

  1. How do 50,000 clicks line up without crushing the database? The per-product queue and its single consumer.
  2. While Maya waits, how does she see her place in line? Queue position from Kafka offsets. 3

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