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fix: derive synthetic output tokens from request identity - #330
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The vLLM and TRT-LLM scheduler path filled output positions without a planned token with unseeded random u32 values. Those tokens determine output-block hashes, so two otherwise identical canonical replays emitted different output token IDs and KV events. Derive each missing position from the request UUID and output ordinal, matching the inputs SGLang already uses. RequestSequence now carries its request ID. XXH3 over a fixed little-endian encoding keeps the values stable across platforms and toolchains and costs no more than the thread RNG it replaces. Signed-off-by: PeaBrane <yanrpei@gmail.com>
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📝 SummaryRisk: Moderate. Three areas need human attention:
Planned output tokens remain unchanged. The Evidence: The supplied changes add cross-backend Technical quality and merge readiness: The supplied evidence supports the intended behavior and test coverage. Merge readiness is not established. Current review findings and severity counts were not supplied. Bot review is not approval. Walkthrough
ChangesRequest token generation
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to Unplanned outputs are now reproducible for stable request IDs across the inspected engines. The repository shows no new output-contract violation, so no actionable merge-blocking risk is established. 🚥 Pre-merge checks | ✅ 7 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (7 passed)
Full details: Cross-Layer ContractExplanation The changed synthetic-output contract is not traced through all affected Rust consumers. Resolution Update the public replay schema documentation for
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @crates/core/tests/artifacts.rs:
- Around line 314-315: Update the artifact test around kv_parts so each backend
must capture a Stored block containing generated output tokens, then verify that
block’s hash against those tokens. Do not rely on kv_events being non-empty or
equality between first and second captures as evidence of output-block hashing.
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crates/core/src/engine/common/sequence.rscrates/core/src/engine/kv_manager/g1_manager.rscrates/core/src/engine/kv_manager/state_cache_tests.rscrates/core/src/engine/kv_manager/vllm_backend.rscrates/core/src/engine/scheduler/vllm/host_offload.rscrates/core/src/engine/scheduler/vllm/request.rscrates/core/src/engine/trace.rscrates/core/tests/artifacts.rs
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⚠️ CI failures not shown inline (31)
GitHub Actions: Full CI / 1_Full CI Success.txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run python - <<'PY'
�[36;1mpython - <<'PY'�[0m
�[36;1mimport json�[0m
�[36;1mimport os�[0m
�[36;1m�[0m
�[36;1mneeds = json.loads(os.environ["NEEDS_JSON"])�[0m
�[36;1mplan = json.loads(os.environ["PLAN_JSON"])�[0m
�[36;1mcomponent_outputs = {�[0m
�[36;1m "platform-wheels": "platform_wheels",�[0m
�[36;1m "collector-data": "collector_data",�[0m
�[36;1m "prediction-regression": "prediction_regression",�[0m
�[36;1m "cargo-deny": "cargo_deny",�[0m
�[36;1m "rust": "rust",�[0m
�[36;1m "rust-feature-modes": "rust_feature_modes",�[0m
�[36;1m "public-api-rust": "public_api_rust",�[0m
�[36;1m "application-wheel": "application_wheel",�[0m
�[36;1m "python-compliance": "application_wheel",�[0m
�[36;1m "application-test-wheel": "application_tests",�[0m
�[36;1m "application-tests": "application_tests",�[0m
�[36;1m "python-compatibility": "python_compatibility",�[0m
�[36;1m "engine-golden-regression": "engine_golden_regression",�[0m
�[36;1m "release-artifact-contract": "release_artifact_contract",�[0m
�[36;1m}�[0m
�[36;1mexpected = {�[0m
�[36;1m "verify-target": "success",�[0m
�[36;1m "select-full-ci": "success",�[0m
�[36;1m "fast-ci": "success",�[0m
�[36;1m}�[0m
�[36;1minvalid_outputs = []�[0m
�[36;1mfor job, output in component_outputs.items():�[0m
�[36;1m selected = plan.get(output)�[0m
�[36;1m if selected not in {"true", "false"}:�[0m
�[36;1m invalid_outputs.append(f"{output}={selected!r}")�[0m
�[36;1m continue�[0m
�[36;1m expected[job] = "success" if selected == "true" else "skipped"�[0m
�[36;1mfailures = []�[0m
�[36;1msummary = [�[0m
�[36;1m f"### Full CI evidence for `{os.environ.get('GITHUB_SHA', 'local')}`",�[0m
�[36;1m "",�[0m
�[36;1m "| Required job | Result |",�[0m
�[36;1m "| --- | --- |",�[0m
�[36;1m]�[0m
�[36;1mfor name, payload in sorted(needs.items()):�[0m
�[36;1m result = payload["result"]�[0m
�[36;1m wanted = expected.ge...
GitHub Actions: Full CI / 3_Application Tests (amd64, support-matrix, 1).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 4_Application Tests (amd64, contracts, 1).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 5_Application Tests (amd64, unit, 3).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 6_Application Tests (arm64, cli-build, 2).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 7_Application Tests (arm64, support-matrix, 1).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 8_Application Tests (amd64, unit, 2).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 9_Application Tests (arm64, unit, 2).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 10_Application Tests (arm64, cli-build, 4).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 11_Application Tests (arm64, tools-build, 1).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 12_Application Tests (arm64, unit, 1).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 13_Application Tests (arm64, unit, 3).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 14_Application Tests (arm64, integration, 1).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 15_Application Tests (amd64, tools-build, 1).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 16_Application Tests (arm64, contracts, 1).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 17_Application Tests (amd64, cli-build, 4).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 18_Application Tests (arm64, cli-build, 1).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 19_Application Tests (arm64, unit, 4).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 20_Application Tests (arm64, cli-build, 3).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 21_Application Tests (amd64, unit, 1).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 22_Application Tests (amd64, cli-build, 2).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 23_Application Tests (amd64, cli-build, 1).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 24_Application Tests (amd64, integration, 1).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 25_Application Tests (amd64, unit, 4).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 26_Application Tests (amd64, cli-build, 3).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mshopt -s nullglob�[0m
�[36;1mwheels=(application-test-dist/aisimulate-*.whl)�[0m
�[36;1mif [[ "${#wheels[@]}" -ne 1 ]]; then�[0m
�[36;1m echo "::error::expected exactly one application test wheel, found ${#wheels[@]}"�[0m
GitHub Actions: Full CI / 38_Release Artifact Contract (amd64).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1m"${MANYLINUX_PYTHON_ROOT}/bin/python" -c \�[0m
�[36;1m 'import sys; assert sys.version_info[:2] == (3, 12), sys.version'�[0m
�[36;1mfor tool in cc c++ make auditwheel patchelf; do�[0m
�[36;1m command -v "${tool}" >/dev/null || {�[0m
�[36;1m echo "::error::manylinux image is missing required tool: ${tool}"�[0m
GitHub Actions: Full CI / 46_Application Test Wheel (arm64).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1m"${MANYLINUX_PYTHON_ROOT}/bin/python" -c \�[0m
�[36;1m 'import sys; assert sys.version_info[:2] == (3, 12), sys.version'�[0m
�[36;1mfor tool in cc c++ make auditwheel patchelf; do�[0m
�[36;1m command -v "${tool}" >/dev/null || {�[0m
�[36;1m echo "::error::manylinux image is missing required tool: ${tool}"�[0m
GitHub Actions: Full CI / 47_Application Test Wheel (amd64).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1m"${MANYLINUX_PYTHON_ROOT}/bin/python" -c \�[0m
�[36;1m 'import sys; assert sys.version_info[:2] == (3, 12), sys.version'�[0m
�[36;1mfor tool in cc c++ make auditwheel patchelf; do�[0m
�[36;1m command -v "${tool}" >/dev/null || {�[0m
�[36;1m echo "::error::manylinux image is missing required tool: ${tool}"�[0m
GitHub Actions: Full CI / 48_Release Artifact Contract (arm64).txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1m"${MANYLINUX_PYTHON_ROOT}/bin/python" -c \�[0m
�[36;1m 'import sys; assert sys.version_info[:2] == (3, 12), sys.version'�[0m
�[36;1mfor tool in cc c++ make auditwheel patchelf; do�[0m
�[36;1m command -v "${tool}" >/dev/null || {�[0m
�[36;1m echo "::error::manylinux image is missing required tool: ${tool}"�[0m
GitHub Actions: Full CI / 52_Select Full CI Scope.txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run set -euo pipefail
�[36;1mset -euo pipefail�[0m
�[36;1mpaths="${RUNNER_TEMP}/full-ci-paths.b64"�[0m
�[36;1mforce_all=false�[0m
�[36;1m�[0m
�[36;1mcase "${GITHUB_EVENT_NAME}:${GITHUB_REF}" in�[0m
�[36;1m workflow_dispatch:*|push:refs/heads/main|push:refs/heads/release/*)�[0m
�[36;1m force_all=true�[0m
�[36;1m : > "${paths}"�[0m
�[36;1m ;;�[0m
�[36;1m push:refs/heads/pull-request/*)�[0m
�[36;1m pr_number="${GITHUB_REF#refs/heads/pull-request/}"�[0m
�[36;1m if [[ ! "${pr_number}" =~ ^[0-9]+$ ]]; then�[0m
�[36;1m echo "::error::invalid trusted PR copy ref: ${GITHUB_REF}"�[0m
GitHub Actions: Full CI / 53_Verify Exact Target.txt: fix: derive vLLM synthetic output tokens from request identity
Conclusion: failure
##[group]Run if [[ "${GITHUB_EVENT_NAME}" == "workflow_dispatch" && -z "${EXPECTED_SHA}" ]]; then
�[36;1mif [[ "${GITHUB_EVENT_NAME}" == "workflow_dispatch" && -z "${EXPECTED_SHA}" ]]; then�[0m
�[36;1m echo "::error::manual Full CI requires a nonempty expected_sha"�[0m
🧰 Additional context used
📓 Path-based instructions (4)
Review scheduler state transitions and event ordering, including cancel, preempt, drain, retry, duplicate, empty, and terminal paths.
⚙️ CodeRabbit configuration file
Files:
crates/core/src/engine/scheduler/vllm/host_offload.rscrates/core/src/engine/kv_manager/g1_manager.rscrates/core/src/engine/kv_manager/vllm_backend.rscrates/core/src/engine/scheduler/vllm/request.rscrates/core/src/engine/kv_manager/state_cache_tests.rscrates/core/src/engine/common/sequence.rscrates/core/src/engine/trace.rs
Read REVIEW.md before commenting.
⚙️ CodeRabbit configuration file
Files:
crates/core/src/engine/scheduler/vllm/host_offload.rscrates/core/src/engine/kv_manager/g1_manager.rscrates/core/src/engine/kv_manager/vllm_backend.rscrates/core/src/engine/scheduler/vllm/request.rscrates/core/src/engine/kv_manager/state_cache_tests.rscrates/core/src/engine/common/sequence.rscrates/core/tests/artifacts.rscrates/core/src/engine/trace.rs
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📄 CodeRabbit inference engine (AGENTS.md)
Files:
crates/core/src/engine/scheduler/vllm/host_offload.rscrates/core/src/engine/kv_manager/g1_manager.rscrates/core/src/engine/kv_manager/vllm_backend.rscrates/core/src/engine/scheduler/vllm/request.rscrates/core/src/engine/kv_manager/state_cache_tests.rscrates/core/src/engine/common/sequence.rscrates/core/tests/artifacts.rscrates/core/src/engine/trace.rs
Source excerpt: Only workflows under the repository-root `.github/workflows/` run for this repository.
📄 CodeRabbit inference engine (REVIEW.md)
Files:
crates/core/src/engine/scheduler/vllm/host_offload.rscrates/core/src/engine/kv_manager/g1_manager.rscrates/core/src/engine/kv_manager/vllm_backend.rscrates/core/src/engine/scheduler/vllm/request.rscrates/core/src/engine/kv_manager/state_cache_tests.rscrates/core/src/engine/common/sequence.rscrates/core/tests/artifacts.rscrates/core/src/engine/trace.rs
🔀 Multi-repo context ai-dynamo/dynamo, ai-dynamo/aiconfigurator
Linked repositories findings
ai-dynamo/dynamo
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The vLLM mock server derives a stable UUID from
(seed, request_id)and supplies explicit syntheticoutput_token_ids, so this path should not depend on the new fallback derivation. SGLang likewise supplies deterministic output IDs.[::ai-dynamo/dynamo::]lib/mocker/servers/vllm/src/server_request.rs:183-205lib/mocker/servers/sglang/src/server_request.rs:87-110
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Potential determinism boundary:
lib/llm/src/mocker.rs:814parsesctx.id()as a UUID but falls back toUuid::new_v4(), then passes it asDirectRequest.uuid(:868-878). Canonical replay using non-UUID context IDs would therefore still receive run-varying derived tokens. -
Offline replay fixtures use explicit UUIDs (
lib/mocker/src/replay/entrypoints.rs:2692-2700), aligning with the new request-ID-based derivation. No references toplanned_output_idswere found; the onlyRequestSequence::newmatches belong to a separatelib/kvbm-logicalAPI.
ai-dynamo/aiconfigurator
- No references to
RequestSequence,planned_output_ids, or replay determinism contracts were found.[::ai-dynamo/aiconfigurator::]
SGLang hashed (request uuid, ordinal) with std's DefaultHasher, whose algorithm is not guaranteed stable across Rust releases, so canonical SGLang output-block hashes could shift with a toolchain upgrade. Route SGLang through the same xxh3-based synthetic_output_token helper as vLLM/TRT-LLM so every engine derives unplanned output tokens identically and stably. Signed-off-by: PeaBrane <yanrpei@gmail.com>
…thetic-output-tokens Signed-off-by: PeaBrane <yanrpei@gmail.com>
Pin synthetic_output_token to independently computed XXH3 values, require every engine to emit the same unplanned stream for one request identity, and check that a stored block holding only generated tokens carries the hash of those tokens. Document that absent output_token_ids derive from request_id and position. Signed-off-by: PeaBrane <yanrpei@gmail.com>
PeaBrane
changed the title
Resolve the import conflict in the SGLang request module: keep main's new queue imports (VecDeque, Deref, RangeFull, QueueStats, QueuedLength) and drop the hashing imports that this branch replaced with the shared synthetic_output_token helper. Signed-off-by: PeaBrane <yanrpei@gmail.com>
Brings in the FPM decoupling / self-service onboarding stack (ai-dynamo#238, ai-dynamo#248, ai-dynamo#347), the output adapters (ai-dynamo#334) and the CI changes (ai-dynamo#349, ai-dynamo#351, ai-dynamo#353, ai-dynamo#354, ai-dynamo#330, ai-dynamo#319). Conflict resolutions: - ENGINE_SPEC_SCHEMA_VERSION: upstream claimed 25 for the FPM decoupling selector; decode CP is renumbered to 26 (positional dcp_size tails on the attention / MLA / DSA ops). Stale-payload loops reject 20..25; the 25 payload keeps the selector like the decoupling branch's 21. - cp_size: upstream added a CP1-only `cp_size` to compile_engine, estimate_kv_cache / estimate_num_gpu_blocks, EngineBuildRequest and the legacy Rust compile path ("this SDK entry point does not support context parallelism"). This branch supports prefill CP at exactly those entry points, so the duplicate parameters / struct field are folded into ours, the CP1 gates become positive-integer validation, and the FPM profile cell selection receives the real cp_size (a profile without that cell fails loud with "no matching FPM deployment profile"). Upstream's tests are adjusted accordingly. - FpmCompileConfig / AicTimingConfig parallel-shape checks combine upstream's `fpm_profile.is_none()` exemption with the `* cp_size` fold; aic_capacity_kwargs gains cp_size / dcp_size; fpm best_available keeps upstream's registered-architecture check ahead of the DCP mode gate. - capacity.py worker resolution carries aic_cp_size / aic_dcp_size next to aic_fpm_profile / worker_type. - ParallelismPresetConfig.prefill_context becomes Optional (None = 1), like decode_context, so default parallelism dumps carry no CP keys; the new onboarding topology tests (ai-dynamo#248) compare those dumps against the six-key request parallelism. Consumers read it through compiler._prefill_cp. Signed-off-by: Tianhao Xu <tianhaox@nvidia.com> Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
) * fix: derive vLLM synthetic output tokens from request identity The vLLM and TRT-LLM scheduler path filled output positions without a planned token with unseeded random u32 values. Those tokens determine output-block hashes, so two otherwise identical canonical replays emitted different output token IDs and KV events. Derive each missing position from the request UUID and output ordinal, matching the inputs SGLang already uses. RequestSequence now carries its request ID. XXH3 over a fixed little-endian encoding keeps the values stable across platforms and toolchains and costs no more than the thread RNG it replaces. Signed-off-by: PeaBrane <yanrpei@gmail.com> * fix: derive SGLang synthetic output tokens from the shared helper SGLang hashed (request uuid, ordinal) with std's DefaultHasher, whose algorithm is not guaranteed stable across Rust releases, so canonical SGLang output-block hashes could shift with a toolchain upgrade. Route SGLang through the same xxh3-based synthetic_output_token helper as vLLM/TRT-LLM so every engine derives unplanned output tokens identically and stably. Signed-off-by: PeaBrane <yanrpei@gmail.com> * test: pin synthetic output tokens and hash a generated block Pin synthetic_output_token to independently computed XXH3 values, require every engine to emit the same unplanned stream for one request identity, and check that a stored block holding only generated tokens carries the hash of those tokens. Document that absent output_token_ids derive from request_id and position. Signed-off-by: PeaBrane <yanrpei@gmail.com> --------- Signed-off-by: PeaBrane <yanrpei@gmail.com>
Summary
Bug. On the vLLM and TRT-LLM scheduler path, an output position with no planned token was filled with
rand::random::<u32>(). Those tokens feed the output-block hashes. As a result, two otherwise identical replays produce different output token IDs and different KVStoredevents, even underReplayDeterminism::CanonicalV1. This affects any request that reaches the engine withoutoutput_token_ids:ReplaySpecrequests that omit them, including JSON specs submitted through the Python bindingEnginecallersTrace and workload drivers are unaffected because they already plan outputs from a fixed seed. SGLang already derived these tokens from the request UUID and the output ordinal, but hashed them with
std'sDefaultHasher, whose algorithm Rust does not guarantee across releases.Root cause.
RequestSequence::generate_token(crates/core/src/engine/common/sequence.rs) fell back to the unseeded thread RNG.Fix.
RequestSequencenow stores its request ID, which is its owner UUID. Each missing position isxxh3_64(request_uuid_bytes ‖ ordinal_le)truncated tou32, via one sharedsynthetic_output_tokenhelper.DefaultHasher(uuid, ordinal), so every engine derives unplanned output tokens identically and stably across toolchains.DefaultHasherfor two reasons. XXH3 is already a dependency for block hashing, and its output is specified across Rust releases and platforms. It also keeps the decode hot path at parity;DefaultHasheradded about 5% host time in the probe below.u32range, as before.RequestSequence::newsignature gains the request ID. Every other call site is a test or fixture; they pass their existing owner UUID, orUuid::nil()insequence.rs's own unit tests.Determinism mode. No new knob, on purpose. Synthetic tokens follow request identity, and
ReplayDeterminismalready controls identity:Randomassigns fresh v4 UUIDs, so outputs still vary from run to run as before.CanonicalV1assigns ordinal UUIDs, so outputs and KV hashes now reproduce.Enginecallers get reproducible outputs whenever they pass reproduciblerequest_ids. (Dynamo's live mocker assigns its own fresh scheduler UUID, so live outputs stay random.)The engine never needs to know the replay mode, and all three engines behave the same way.
Observable change. Only output token IDs and output-block KV hashes of unplanned requests change: vLLM/TRT-LLM move from unseeded random values to the shared derivation (in
Randommode they now follow the v4 request UUID), and SGLang's values change fromDefaultHasherto xxh3 outputs over the same inputs. Simulated timing and metrics are unchanged, and there is no public or serialized contract change.Not changed.
Test.
canonical_replay_reproduces_unplanned_output_tokens_and_kv_hashesincrates/core/tests/artifacts.rsruns the sameCanonicalV1artifact replay twice for each backend (vLLM, TRT-LLM, SGLang). The replay has two requests with identical materialized prompts (6 tokens) and no output plan (9 output tokens each). The test requires:tokens_hashmatches XXH3 of those tokenssynthetic_output_tokens_match_independent_xxh3_valuespins the helper to values computed with an independent XXH3 implementation (Pythonxxhash). A per-process hasher seed or a dropped ordinal therefore fails the test, even though both runs share one test process.Validation
main(9f140b7) plus only the new test: fails. TheVllm request 0output tokens differ between the two runs.ba96a1a0, with currentmainmerged in):cargo test --workspacepasses, 1,772 passed, 0 failed, 1 already ignored.cargo fmt --all -- --checkis clean.googleapis-common-protosbreak that already failed onmainat the old base. That break was fixed onmainby fix(deps): constrain Google protos for Vizier compatibility #335, which is now merged into this branch.cargo test --workspacepasses (1656 lib tests plus all integration tests; 0 failed, 1 ignored, which was already ignored).cargo fmt --all -- --checkis clean. Run on Linux x86_64 with rustc 1.93.1.mainand 684.1 ms on this branch, which is within noise.🤖 Generated with Claude Code