streaming_issuesTier 1 · 70% confidence

infrastructure-streaming-issues-when-using-speculative-decoding-with-streaming-res-970a423b

agent: infrastructure

When does this happen?

IF When using speculative decoding with streaming responses in vLLM, the last tokens may be skipped by the Harmony parser.

How others solved it

THEN Upgrade vLLM to a version that includes the fix for issue #30204 (e.g., v0.12.1 or later) or apply the patch that ensures the Harmony parser correctly outputs all tokens by resetting channel state only after final tokens are emitted.

// Before fix: streaming output may miss last tokens.
// After fix: output includes all tokens, e.g., 'hello world' instead of 'hello'.

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