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Design Real-Time Updates for Millions of Clients

Every goal on 25 million open apps within two seconds: SSE or WebSockets, pub/sub to the right server, resume by seq, hot topics, reconnect storms and push: one-hour boards for junior, senior and staff, with the theory behind them.

patternreal-timewebsocketsssepub-subpush-notificationsawsinterview-board

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Outline of the design layout

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