Grokking Modern Mobile System Design Interview
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Stock Tickers and Live Comment Streams

1. The Question

“Design a live stock watchlist and a live-comment view that remain usable during high update rates.”

A newer display price may replace an older one, but a new comment does not replace another person’s words. These two examples share an update-rate problem while requiring different data-loss policies.

Try your own design for ten minutes before reading the walkthrough.

2. The Walkthrough

Use the Five Step Method

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