Building a Real-Time Music Service
summary
Building Soundrop migrates a Python/node.js prototype to an Erlang/OTP backend that runs rooms as processes, implements a custom websocket transport, and uses hot code patching to avoid disconnects during fixes. Claims include 6,000+ concurrent listeners synchronized to soft real time playback, per-user and per-room processes for fault isolation, and practical scaling limits (gproc inter-node traffic, MongoDB driver pain). Demonstrated systems actually run, recover from room crashes, and keep most rooms unaffected.
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