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feat(frontend): session id plumbing into requests - #48048
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This pull request has merge conflicts that must be resolved before it can be |
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can we get this pls @tlrmchlsmth @njhill @ivanium @DarkLight1337 @chaunceyjiang |
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| @@ -215,6 +216,22 @@ def _get_data_parallel_rank(raw_request: Request | None) -> int | None: | |||
| except ValueError: | |||
| return None | |||
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| @staticmethod | |||
| def _get_session_id( | |||
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ServingTokens (scale_out/token_in_token_out/serving.py) subclasses GenerateBaseServing but its generate(...) call does not pass session_id, while it does extract the router-injected data_parallel_rank header right above.
The tokens-in path is what routers and P/D deployments call, and routers are the primary producers of session identity, so this is the "missed path silently drops labels" case the RFC warns about.
Worth threading here (header-based, since that protocol has no session_id body field) or tracking as a follow-up.
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Thanks @bongwoobak, added the session_id plumbing through the tokens-in path and a small unit test
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@claude review |
njhill
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Thanks @karen-sy!
It would also be good to add this to the rust grpc interface https://github.com/vllm-project/vllm/blob/main/rust/proto/inference.proto
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Hey @njhill , thanks for the review! Added plumbing to the gRPC surface too. |
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This pull request has merge conflicts that must be resolved before it can be |
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Will hold off running CI until latest conflicts are resolved |
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Signed-off-by: Karen Chung <karenc@nvidia.com>
Signed-off-by: Karen Chung <karenc@nvidia.com>
Signed-off-by: Karen Chung <karenc@nvidia.com>
Signed-off-by: Karen Chung <karenc@nvidia.com>
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@njhill Thanks! Rebased. |
5 participants
Purpose
PR #1 of #48049
Add a first-class request-level
session_idto vLLM so related requests in the same conversation, agent run, or session can carry stable identity without overloadingrequest_idor storing session identity inSamplingParams.extra_args.This PR plumbs
session_idthrough OpenAI-compatible request bodies, HTTPX-Session-ID, a temporary compatibility fallback fromvllm_xargs["session_id"], Python engine APIs,EngineCoreRequest.session_id, internalRequest.session_id, parallel sampling, beam search, and the Rust HTTP/OpenAI and engine-core client paths.This does not add session-aware scheduling or routing policy to vLLM. It only makes stable session identity available to engine internals, KV/cache policy, schedulers, or connectors that may choose to consume it in follow-up changes.
Both the Python and Rust frontends are modified.
Test Result
Ran new unit tests added by PR.
Essential Elements of an Effective PR Description Checklist
supported_models.mdandexamplesfor a new model.