Server-Sent Events (SSE) Backpressure Breaks: Memory Leaks and Socket Starvation in High-Throughput LLM Pipelines
Streaming LLM completions over Server-Sent Events (SSE) looks trivial in sandbox demos, but unhandled backpressure under real-world network conditions can destroy backend application servers. When slow clients fail to consume token chunks as fast as upstream model APIs generate them, unbounded Node.js internal stream buffers trigger memory leaks and OOM process crashes. Here is an architectural…
Server-Sent Events (SSE) are a popular method for streaming data from a server to a client, but handling backpressure can be challenging. When a client's network connection is slow, the upstream model provider may generate tokens much faster than the client can consume them. This mismatch can lead to memory leaks and even cause the server to crash due to out-of-memory errors.
The source material delves into the mechanics of unhandled backpressure in event streams and provides a production-ready backpressure-aware SSE pipeline to mitigate these issues.
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