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Signed-off-by: Harry Lee <harrli@nvidia.com>
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WalkthroughThe Python bindings add ChangesOfflineRouter
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🟡 Moderate · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 16.94% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 124 functions across 12 files. (2 skipped… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
| Description check | |
The description provides substantial scope, implementation details, reviewer guidance, integration context, and validation results. However, it does not include the required "## Related Issues" sectio… | Add a "## Related Issues" section and reference the issue using the required format, such as "Relates to #38" or "Closes #38". Preserve the existing details and validation information unless the issue number requires a repository-qualified … |
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Title check The title clearly identifies the main change: exposing native scheduler and affinity capabilities through Python bindings.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 16.94% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 124 functions across 12 files. (2 skipped: 2 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
Full details: Description check
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Explanation
The description provides substantial scope, implementation details, reviewer guidance, integration context, and validation results. However, it does not include the required "## Related Issues" section or a supported issue reference format. It ends with "Part of ai-dynamo/aisimulate#38", which does not match the repository template.
Resolution
Add a "## Related Issues" section and reference the issue using the required format, such as "Relates to
#38" or "Closes#38". Preserve the existing details and validation information unless the issue number requires a repository-qualified reference because it is in another repository.
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Actionable comments posted: 2
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @lib/bindings/python/rust/llm/offline_router/router.rs:
- Around line 739-746: Update finalize_worker_removal to remove wid from
workers_with_configs when it is still eligible, and publish the updated
collection through workers_tx only when a removal occurs. Preserve the existing
slot unregistration and indexer tree cleanup behavior.
Review comments at @lib/bindings/python/tests/test_offline_router_policy.py:
- Line 17: Update the module-level pytestmark to include the required pre_merge
lifecycle marker alongside unit and gpu_0, and add timeout markers to
test_idle_affinity_does_not_expire_in_host_wall_time and
test_policy_runs_when_simulator_python_imports_are_blocked, using durations
appropriate for the sleep and subprocess work.
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📒 Files selected for processing: 14
lib/bindings/python/Cargo.tomllib/bindings/python/rust/lib.rslib/bindings/python/rust/llm.rslib/bindings/python/rust/llm/offline_router/README.mdlib/bindings/python/rust/llm/offline_router/affinity.rslib/bindings/python/rust/llm/offline_router/helpers.rslib/bindings/python/rust/llm/offline_router/mod.rslib/bindings/python/rust/llm/offline_router/router.rslib/bindings/python/rust/llm/offline_router/runtime.rslib/bindings/python/rust/llm/offline_router/tests.rslib/bindings/python/rust/llm/offline_router/wire.rslib/bindings/python/src/dynamo/_core.pyilib/bindings/python/src/dynamo/llm/__init__.pylib/bindings/python/tests/test_offline_router_policy.py
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Previously reported defects still present:
- Original discussion: The Python test module still declares only
unitandgpu_0, so it lacks the required lifecycle marker and may be deselected from its intended pre-merge stage; the wall-clock sleep and subprocess cases also still lack pytest timeout markers. - Original discussion: The reported direct-
worker_removeddefect remains:finalize_worker_removalunregisters slots and clears the radix tree without removing the worker fromworkers_with_configsor publishing the updated selector membership, so a removed worker remains selectable unless the host previously sentworker_draining. - Original discussion: Verified at the reviewed head:
worker_removedaccepts any known worker, butfinalize_worker_removaldoes not remove it fromworkers_with_configsor publish the updated worker set. Callingworker_removedwithoutworker_drainingtherefore leaves the removed worker eligible for selection, and later re-adding that ID poisons the handle because its router entry still exists. Remove and publish eligibility during final removal, or require the draining transition first. - Original discussion: Verified still present:
worker_removedis accepted for any known worker, butfinalize_worker_removalunregisters slot/indexer state without removing the worker fromworkers_with_configsor publishing the new selection set. A direct removal can therefore leave the removed worker selectable, and a laterworker_readyfor that ID fails because the internal config still exists, poisoning the handle. Remove and publish the worker during finalization when it remains eligible, or require a preceding draining transition.
| use dynamo_kv_router::scheduling::queue::DEFAULT_MAX_BATCHED_TOKENS; | ||
| use dynamo_kv_router::{ActiveSequencesMultiWorker, NoopSequencePublisher}; | ||
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| /// The engine capacity/topology fields needed by the native Router. |
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This comment merely expands NativeRouterEngineArgs; the private struct name and its capacity/topology fields already convey the same information, with no invariant or constraint added.
🤖 AI Fix
Remove this redundant doc comment.
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| pub(super) fn dispatch_aborted(&mut self, request_id: Uuid, now_ms: f64) -> Result<()> { | ||
| self.router.advance_time(now_ms)?; |
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Aborting an admitted request frees its scheduler booking, and free_if_booking notifies queued admissions that capacity changed, but this path neither polls those admissions nor schedules a wakeup for routers without affinity (next_wakeup_ms only consults affinity.ready). Such a response can therefore report pending_count > 0 with next_wakeup_ms: null, leaving the newly ready placement stranded under the documented wakeup-driven host loop. Drain admissions here or expose an immediate non-affinity wakeup after the free.
🤖 AI Fix
Make dispatch_aborted arrange an immediate poll of newly woken admissions for every router, either by returning the released placements or by setting a general wakeup flag consumed by advance_clock.
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| def test_decode_load_tracks_independent_allocations_for_identical_prompts(): | ||
| # Route two equal prompts to one worker. Their decode allocations are |
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These lines restate the test name and the immediately visible setup: two identical requests are placed and their independent decode load is asserted. They add no non-obvious reason or constraint.
🤖 AI Fix
Remove these two narrating comment lines.
Signed-off-by: Harry Lee <harrli@nvidia.com>
❌ Dynamo PR CI failed — run 39352788461 (attempt 1) on
|
| Other | Jobs |
|---|---|
| dynamo-runtime | ❌ 2 ✅ 6 |
Failure details
2 jobs failed (amd64 and arm64 runtime CPU tests) with the same cause: 2 tests in deploy/helm/charts/platform/tests/test_grove_version.py shell out to helm, which is not installed in the test image (FileNotFoundError: ... 'helm').
❌ dynamo-runtime / test / parallel cuda13.0, amd64: FileNotFoundError: 'helm' in test_grove_version.py
Job: dynamo-runtime / test / parallel cuda13.0, amd64 · Failed step: Run CPU-only tests (parallelized) · Logs: gh run view --job 118405115961 -R ai-dynamo/dynamo --log-failed
deploy/helm/charts/platform/tests/test_grove_version.py:51: in test_dependency_and_preflight_use_same_chart_version
self.helm(
deploy/helm/charts/platform/tests/test_grove_version.py:15: in helm
result = subprocess.run(
args = ('template', 'verifier', '/tmp/tmp1o5gv6p9/verifier', '--set-file', 'platformChart=/workspace/deploy/helm/charts/platform/Chart.yaml')
E FileNotFoundError: [Errno 2] No such file or directory: 'helm'
FAILED deploy/helm/charts/platform/tests/test_grove_version.py::GroveVersionTest::test_dependency_and_preflight_use_same_chart_version - FileNotFoundError: [Errno 2] No such file or directory: 'helm'
FAILED deploy/helm/charts/platform/tests/test_grove_version.py::GroveVersionTest::test_git_source_and_package_read_changed_dependency_without_generation - FileNotFoundError: [Errno 2] No such file or directory: 'helm'
GroveVersionTest::test_dependency_and_preflight_use_same_chart_version and ::test_git_source_and_package_read_changed_dependency_without_generation both call helm template via subprocess.run, but the helm binary is not on PATH in the runtime test container, so both fail (also on every Early Flake Detection retry). The tests need helm in the image or a skip when it is absent.
❌ dynamo-runtime / test / parallel cuda13.0, arm64: FileNotFoundError: 'helm' in test_grove_version.py
Job: dynamo-runtime / test / parallel cuda13.0, arm64 · Failed step: Run CPU-only tests (parallelized) · Logs: gh run view --job 118405116082 -R ai-dynamo/dynamo --log-failed
FAILED deploy/helm/charts/platform/tests/test_grove_version.py::GroveVersionTest::test_dependency_and_preflight_use_same_chart_version - FileNotFoundError: [Errno 2] No such file or directory: 'helm'
FAILED deploy/helm/charts/platform/tests/test_grove_version.py::GroveVersionTest::test_git_source_and_package_read_changed_dependency_without_generation - FileNotFoundError: [Errno 2] No such file or directory: 'helm'
Same 2 tests and same error as the amd64 job: helm is not installed in the test container.
For agents
{"pr": 16854, "run_id": 39352788461, "run_attempt": 1, "head_sha": "b5a8eab3d62b26ed3bc5ff341574658c920aefb9",
"failures": [
{"job": "dynamo-runtime / test / parallel cuda13.0, amd64", "job_id": 118405115961, "failed_step": "Run CPU-only tests (parallelized)", "signature": "FileNotFoundError: [Errno 2] No such file or directory: 'helm'", "tests": ["deploy/helm/charts/platform/tests/test_grove_version.py::GroveVersionTest::test_dependency_and_preflight_use_same_chart_version", "deploy/helm/charts/platform/tests/test_grove_version.py::GroveVersionTest::test_git_source_and_package_read_changed_dependency_without_generation"], "log_cmd": "gh run view --job 118405115961 -R ai-dynamo/dynamo --log-failed"},
{"job": "dynamo-runtime / test / parallel cuda13.0, arm64", "job_id": 118405116082, "failed_step": "Run CPU-only tests (parallelized)", "signature": "FileNotFoundError: [Errno 2] No such file or directory: 'helm'", "tests": ["deploy/helm/charts/platform/tests/test_grove_version.py::GroveVersionTest::test_dependency_and_preflight_use_same_chart_version", "deploy/helm/charts/platform/tests/test_grove_version.py::GroveVersionTest::test_git_source_and_package_read_changed_dependency_without_generation"], "log_cmd": "gh run view --job 118405116082 -R ai-dynamo/dynamo --log-failed"}
]}Posted automatically by Devin for run 39352788461. Updated on every full-CI run of this PR.
Harrilee
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Summary
Expose existing Dynamo routing capabilities to Python hosts through thin
OfflineRouterandSessionAffinitybindings. Reuse the existingRadixTreeand hash bindings. NativeLocalSchedulerstill performs selection, admission, load accounting and cancellation; nativeSessionAffinityowns binding, lease and TTL behavior.The bindings accept native fields and explicit clock advances. They contain no AISim request schema, conversation-tree interpretation, role-specific simulation configuration, lifecycle protocol or reporting. Hosts own that translation and simulation execution. No additional wheel/crate or AISim dependency change is introduced.
Start with
lib/bindings/python/rust/llm/offline_router.rs(530 lines) and its Python declarations in_core.pyi. The complete PR adds 764 lines including registration, declarations and five boundary tests.Integration
Merge this API before AISimulate #306, which owns AgentX simulation and acceptance. Dynamo #15240 remains an optional downstream dependency update. Existing #15631/#16490 remain unchanged; no release backport is requested.
Validation
ais-forward-passor any AISim pin change.ai-dynamoplugin.Calls are synchronous and thread-affine. Python transport performance has not been benchmarked.
Part of ai-dynamo/aisimulate#38.