System Design Interview Crash Course
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Design a Live Comment Streaming Service (Twitch Chat)

Here is the step-by-step system design for a Live Comment Streaming Service like Twitch Chat.

1. Problem Definition and Scope

We are designing a real-time chat infrastructure where millions of users can watch a live video stream and interact via text. The system must handle massive spikes in traffic during popular events.

  • Main User Groups:

    • Viewers: Join channels, read live chat, and send messages.

    • Streamers: Broadcast content and interact with the chat.

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