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Existing open-source chat implementations failed to handle connection dropouts gracefully, leaving users with out-of-order messages and high reconnection latencies in low-network regions.
Built a customized message queue logic with local browser database (IndexedDB) reconciliation. Developed a custom Socket.io server layer with Redis adapter that matches local sequence indexes to ensure complete, ordered message deliveries upon reconnecting.
1. Designing sequence numbering logic for all chat events. 2. Implementing sliding-window acknowledgments on the client side. 3. Stress testing using autocannon to simulate 5,000 concurrent sockets.
Guaranteed ordered delivery of messages regardless of flaky networks. Reconnection sync time fell under 200ms. Socket CPU consumption dropped by 45% due to compact payload formats and reduced handshake logic.
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