Building a Scalable Pub/Sub system with UpRing
summary
A working demo of UpRing shows a Node-based P2P system that shards keys on a consistent hashring and routes live connections (SSE/WebSocket) to the node owning that key so stateful sessions survive node failure. Membership uses SWIM gossip membership for fast failure detection, replication writes to 2 copies on write (Dynamo-style), and nginx plus a pmax shell run the demo. The pub/sub built on UpRing survives killed peers, rehashes ownership, and is open source MIT-licensed.
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