Grokking the System Design Interview, Volume II
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Step 7: Scalability and Performance

On an ordinary morning, this system serves a few thousand feed requests a second and takes in about one article a second. Now suppose a major earthquake makes the news. Within minutes, publishers file hundreds of articles about it, millions of users open the app, and a million phones expect an alert. That one story creates five separate problems, and each needs its own fix:

  1. The data and traffic are too large for one machine.
  2. Millions of readers ask for the same article at once.
  3. Hundreds of articles arrive faster than workers can process them. 4

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