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How Redis Pub/Sub and WebSockets Solve Real-Time Scaling Challenges

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Modern applications increasingly demand real-time interactivity, making low-latency communication a core engineering requirement rather than an optional feature. WebSockets, standardized under RFC 6455, have become the dominant protocol for persistent, bidirectional client-server communication, replacing inefficient older approaches like HTTP polling. However, WebSocket connections are stateful, meaning each client is tied to a specific server instance, which creates serious obstacles when scaling horizontally across multiple nodes. Without a synchronization layer, messages can become siloed per server, causing fragmented user experiences, file descriptor exhaustion, and memory overflows. The article outlines how Redis Pub/Sub and Redis Streams can serve as a message broker backbone to bridge these isolated server instances and enable reliable, high-concurrency real-time applications.

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