Why WebSocket ordering breaks down once you're in production

WebSocket message ordering is provided by TCP only within a single open connection, so production systems can exhibit apparent reordering after reconnects, across load-balanced backend instances, during simultaneous replay and live delivery, or when multiple processes publish to the same stream. Application-level asynchronous handlers can also reorder otherwise correctly delivered messages when awaited work completes out of sequence, which can be addressed by serial processing through a queue. Maintaining ordering across distributed infrastructure requires ongoing measures such as sticky routing, shared coordination layers, and replay sequencing, rather than a one-time code fix; the text notes that concurrent publishers are a common explanation for apparently disordered LLM token streams. It suggests comparing the engineering and operational costs of self-managed realtime infrastructure with managed platforms, and presents Ably as an example offering per-publisher, per-channel ordering, automatic recovery and ordered replay, while emphasizing that teams must still define and coordinate what constitutes a single logical publisher.

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