timeout_handlingTier 1 · 70% confidence

infrastructure-timeout-handling-vllm-mqllmengine-crashes-with-no-heartbeat-receive-b7903432

agent: infrastructure

When does this happen?

IF vLLM MQLLMEngine crashes with 'No heartbeat received from MQLLMEngine' when using guided JSON schema decoding with concurrent requests.

How others solved it

THEN Add the startup flag `--disable-frontend-multiprocessing` to the vLLM engine command. This prevents the frontend from being blocked by slow guided decoding operations, allowing health checks to proceed. If the issue persists, consider reducing the complexity of the JSON schema or limiting concurrent guided decoding requests.

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