The Unbelievable Scale of WhatsApp
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Every day, WhatsApp handles tens of billions of messages. During peak hours,
that can mean millions of messages per second. A normal app might run on a few servers.
WhatsApp runs on thousands of machines spread across multiple data centers worldwide. If even a small
part of that system slows down, users feel it immediately as delays, failed messages,
or outages. So the real question is, how do you keep a global system
like that fast, reliable, and secure, even when parts of the internet
are constantly breaking? The answer starts with three core principles: decentralize, replicate,
and retry.
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