fix(validator): isolate each NCCL benchmark run in its own namespace - #2443
fix(validator): isolate each NCCL benchmark run in its own namespace#2443mikecook wants to merge 3 commits into
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Included review availability: Your plan provides up to 12 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughNCCL benchmark runs now use isolated per-run namespaces. Namespace ownership checks reject live foreign workloads. Resource, pod, and diagnostic operations use the run namespace. Cleanup deletes the namespace, waits for termination, and propagates failures. Stale fixed-name resources are updated in place. Tests cover namespace lifecycle, cleanup failures, timeouts, and stale-resource handling. Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to Per-run namespaces can still be reused by concurrent executions with the same run ID before the first workload is created, allowing one execution to modify or clean up another execution’s resources. Ownership must be made atomic before this change is merge-ready. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In `@validators/performance/nccl_all_reduce_bw_constraint.go`:
- Around line 495-496: Preserve structured namespace lifecycle errors by
replacing the generic wrapping around ensureNamespace at
validators/performance/nccl_all_reduce_bw_constraint.go:495-496 and
waitForNamespaceGone at
validators/performance/nccl_all_reduce_bw_constraint.go:2143-2145 with
aicrErrors.PropagateOrWrap, retaining the existing contextual messages.
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validators/performance/nccl_all_reduce_bw_constraint.govalidators/performance/nccl_all_reduce_bw_constraint_test.govalidators/performance/nccl_roce_apply_test.govalidators/performance/trainer_ensure_test.govalidators/performance/trainer_lifecycle.go
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The NCCL all-reduce TrainJob/TrainingRuntime/ComputeDomain/RoCE-claim resources are applied by fixed name in the shared, persistent aicr-validation namespace, so two concurrent `aicr validate` runs (or a crashed run and its retry) could delete or adopt each other's resources. This affects every NCCL leaf in the catalog (EFA, TCPXO, RoCE, NVLS across A100/H100/B200/GB200/GB300), not just one accelerator or fabric. Give each run its own namespace instead, mirroring the pattern inference-perf already uses (deriveRunID/ensureNamespace): every fixed resource name only has to be unique within its own namespace, so concurrent or crashed runs can never collide, adopt, or delete each other's resources. Cleanup deletes the namespace and waits for it to fully terminate (cascading GC for anything created in it) before returning, and now returns a real cleanup failure instead of only logging it, so a genuine cleanup failure fails the check. Signed-off-by: Mike Cook <micook@nvidia.com>
ensureNamespace and waitForNamespaceGone can return a StructuredError with a specific code (e.g. ErrCodeTimeout when a namespace is stuck terminating). Wrapping their errors with a fresh ErrCodeInternal flattened that code away instead of letting it propagate. Use PropagateOrWrap so an already-coded error passes through unchanged, falling back to ErrCodeInternal with the existing contextual message only when it isn't one. Signed-off-by: Mike Cook <micook@nvidia.com>
| // fixed resource name below only has to be unique within it, so two | ||
| // concurrent (or one crashed, one retried) aicr validate runs can never | ||
| // collide, adopt, or delete each other's resources — no lock required. | ||
| gpuConfig.Namespace = fmt.Sprintf("%s-%s", ncclWorkloadNamespacePrefix, deriveRunID()) |
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MAJOR: Treat an existing run namespace as an ownership conflict, not success
ensureNamespace returns success for any active namespace with this derived name, but this path then creates fixed-name resources with Create and unconditionally deletes the namespace on exit. A retry with the same AICR_RUN_ID therefore hits AlreadyExists on stale TrainingRuntime/TrainJob resources instead of recovering, while an overlapping or colliding run can adopt and later delete the other run's entire namespace. This contradicts the isolation/retry invariant described here.
Minimum correction: make the namespace collision-resistant per live execution, verify ownership before reuse or cleanup, and delete with a UID precondition. If same-run recovery is required, reclaim only after proving the prior execution is no longer live and reconcile its fixed-name resources. Add regressions for an active foreign namespace and stale same-run resources.
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Multi-persona review — PR #2443 (isolate each NCCL benchmark run in its own namespace)
Method: 3 independent persona reviewers (Correctness/Concurrency, Kubernetes Domain/Operability, Test-coverage) fanned out in parallel, then every finding was re-derived from the resolved code by an adversarial senior meta-reviewer. Reviewed at live head 0fa13a13f (the earlier 64a5680f4 was stale — the follow-up commit preserve structured errors from namespace lifecycle is included and resolves the one error-code finding).
Legend: 🔴 Blocker · 🟠 Major · 🟡 Minor · 🔵 Nitpick
Assessment: Solid, well-tested change that faithfully adopts the inference-perf per-run-namespace pattern. The primary production path (recipe declares kubeflow-trainer via --platform kubeflow) is correct and now has good regression coverage. No finding fires on the default path and none corrupts results — the worst cases fail closed. Recommendation: Approve with comments. Three 🟡 threads are worth a look before merge but none blocks it.
| Tier | Count |
|---|---|
| 🔴 Blocker | 0 |
| 🟠 Major | 0 |
| 🟡 Minor | 4 |
| 🔵 Nitpick | 3 |
Confirmed non-issues (examined, solid): namespace threading (no ctx.Namespace leak); foldCleanupError fallbackMsg threading + semantics; RBAC/SA/cluster-scoped deps (Trainer controller is cluster-scoped, reconciles the per-run-ns TrainJob); DNS-1123 validity + no collision with the aicr-inference-perf-<hex> sibling; deriveRunID 8-hex length invariant; cleanup correctly on context.Background; the two headline regression tests are well-constructed and 50× race-clean; error-code preservation is correct at the live head.
| // NotFound-tolerant, so running it after an early/partial-apply failure is | ||
| // safe. A cleanup failure only overrides a nil benchErr — see | ||
| // foldCleanupError — so it never masks a real benchmark failure. | ||
| defer func() { |
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🟡 Reversed defer order drops the removed "delete CRs while the CRDs still exist" guarantee (self-install path). The namespace-cleanup defer is registered here (504) before the ensureTrainerInstalled block, and the deleteTrainer defer at :522 is registered after — so LIFO runs deleteTrainer first, then the namespace delete. The comment you removed documented the deliberate opposite ordering ("NCCL CRs are deleted while their CRDs still exist, rather than relying on CRD-delete cascade GC"). On the self-install fallback (installedResources > 0, i.e. the recipe does not declare kubeflow-trainer), deleteTrainer tears down the controller + trainjobs/jobsets CRDs first; if those CRs carry controller-serviced finalizers, the per-run namespace can hang Terminating, waitForNamespaceGone times out at 5m, and foldCleanupError turns a green benchmark into a failure. Production/UAT --platform kubeflow runs return no installed resources so this defer never registers — hence 🟡, not higher. Consider registering the namespace-cleanup defer after the deleteTrainer block (so the ns drains while the controller is still alive), or reaping the TrainJob/TrainingRuntime CRs by name before deleteTrainer. Note this competes with the install-failure-leak coverage the early registration was chosen to give — a single defer can't satisfy both, so it's worth an explicit decision.
| // Same bound as ensureNamespace's wait on the create side (see | ||
| // defaults.InferenceNamespaceTerminationWait doc comment) — this cascade | ||
| // is the same finalizer chain, just observed from the delete side. | ||
| waitCtx, waitCancel := context.WithTimeout(context.Background(), defaults.InferenceNamespaceTerminationWait) |
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🟡 Folding a namespace-termination wait timeout into the check verdict can fail an otherwise-green benchmark, and diverges from the sibling it mirrors. The sibling cleanupInferenceWorkload fires Namespaces().Delete and returns (fire-and-forget, slog.Warn on error). Here you additionally block up to InferenceNamespaceTerminationWait (5m) on waitForNamespaceGone and, via foldCleanupError at :505, return its ErrCodeTimeout as the check result when benchErr == nil. NVLS runs create a ComputeDomain + auto-generated ResourceClaimTemplate whose DRA/IMEX finalizers are legitimately slow — a namespace that takes >5m to GC would fail a certified-good bandwidth result, exactly on the high-value dual-fabric GB200 path, where the identical inference situation passes silently. The wait is also largely redundant for correctness: with per-run namespaces the only same-name reuse is a same-AICR_RUN_ID retry, which ensureNamespace's create-side terminating-wait already covers. Suggest keeping the wait for teardown observability but logging its timeout rather than folding it into the verdict (the Namespaces().Delete itself, once accepted, GCs server-side regardless).
| // Isolate this run in its own namespace, the same pattern | ||
| // inferenceWorkloadConfig uses (see deriveRunID/ensureNamespace): every | ||
| // fixed resource name below only has to be unique within it, so two | ||
| // concurrent (or one crashed, one retried) aicr validate runs can never |
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🟡 Isolation is keyed on runID alone, but the NCCL variants share one run ID — the "can never collide" claim holds only across separate invocations. deriveRunID() hashes AICR_RUN_ID, and all three catalog checks (nccl-all-reduce-bw, -net, -nvls) in one validate run get the same 8-hex suffix → the identical namespace aicr-nccl-perf-<hex> and identical fixed resource names. It's safe today because intra-phase entries run serially and the blocking waitForNamespaceGone guarantees -net's namespace is fully gone before -nvls reuses the name. But the in-repo TODO(perf) to parallelize intra-phase entries would put two variants in the same namespace concurrently, and the first to finish would Namespaces().Delete the sibling's in-flight pods — strictly worse than the pre-PR shared-namespace behavior. Worth either folding the variant/check identity into the namespace suffix now (e.g. aicr-nccl-perf-<variant>-<runID>), or leaving a note on that TODO that per-variant namespaces are a prerequisite for parallelizing this phase. (Minor, related: this comment also overstates the same-AICR_RUN_ID retry case — createUnstructured is not AlreadyExists-tolerant, so a crash that leaves an Active, non-terminating namespace would fail the retry on AlreadyExists; ensureNamespace only waits when the prior namespace is already Terminating.)
| // registered right after ensureNamespace succeeds, not after | ||
| // ensureTrainerInstalled, or a Trainer-install failure returns before the | ||
| // defer is ever registered and leaks the per-run namespace forever. | ||
| func TestRunNCCLTrainJob_TrainerInstallFailureCleansUpNamespace(t *testing.T) { |
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🟡 This guard only covers the early-probe-fail branch — the defer-interaction path where the F3 risk lives is untested. Forcing the CRD get reactor to ServiceUnavailable makes ensureTrainerInstalled return before it installs anything, so runNCCLTrainJob returns with installedResources == nil — before the deleteTrainer defer is even registered. So this proves the namespace-cleanup defer fires on an early error, but never exercises the installedResources > 0 case where deleteTrainer and the namespace cleanup both run in LIFO order (the reversed-ordering concern above). Consider a companion case: seed a complete Trainer install so the probe reports installed, force a downstream failure (e.g. in applyNCCLResources), and assert both the namespace is gone and deleteTrainer ran — ideally asserting their relative order.
| // fixed resource name below only has to be unique within it, so two | ||
| // concurrent (or one crashed, one retried) aicr validate runs can never | ||
| // collide, adopt, or delete each other's resources — no lock required. | ||
| gpuConfig.Namespace = fmt.Sprintf("%s-%s", ncclWorkloadNamespacePrefix, deriveRunID()) |
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🔵 Orphan-namespace accumulation for standalone runs + serial wall-clock cost. When AICR_RUN_ID is unset (standalone aicr validate, not the Job path), deriveRunID() uses a random suffix; a process killed before the deferred cleanup runs leaves an aicr-nccl-perf-<hex> namespace nothing ever reclaims (the Job path self-heals because the deterministic run-ID is reused and ensureNamespace drains a terminating prior namespace). Separately, the blocking wait adds up to 5m per variant to the serial performance phase. Both low-priority; a labeled sweep for stale aicr-nccl-perf-* namespaces (mirroring the existing UAT janitor thinking) would cover the leak if it ever matters.
| if _, err := fakeClient.Resource(resourceClaimTemplateGVR).Namespace(ns). | ||
| Get(context.Background(), ncclRoceClaimName, metav1.GetOptions{}); err != nil { | ||
| t.Fatalf("precondition: claim should exist before cleanup: %v", err) | ||
| if got := atomic.LoadInt32(&deleteCalls); got < 2 { |
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🔵 deleteCalls < 2 is a weaker guard than its comment implies, and start is captured after the goroutine launches. The second delete is fired unconditionally by the test's own goroutine at t=200ms, so deleteCalls reaching 2 doesn't by itself prove cleanup blocked — the real guard is the elapsed >= holdFinalizer check below it (which does fail-close, since a pre-fix early return hits the assertion at ~0ms with deleteCalls still 1). Also start := time.Now() on :219 is taken after the go func(){...}() on :214, so if the goroutine's time.Sleep(200ms) began before start was assigned, elapsed could dip marginally under the bound. Empirically robust (50× race-clean), so this is just cheap hardening: capture start before the go statement, or assert against a slightly reduced bound.
ensureNamespace treated any active, non-terminating namespace with the derived per-run name as safe to adopt, and cleanupNCCLResources deleted it unconditionally on exit. Since deriveRunID is deterministic for a given AICR_RUN_ID, this let a same-run retry collide with (rather than recover from) a still-live prior execution, and let cleanup delete a namespace another run actively owns. verifyNCCLNamespaceNotLive now fails closed with ErrCodeConflict when an existing, non-terminating namespace still has a non-terminal pod in it, before ensureNamespace is ever called. cleanupNCCLResources pins its delete to the namespace UID captured right after creation/reclaim, so a namespace deleted and recreated under the same name in between can't be removed by the wrong run. createUnstructured now reclaims (Get + Update) an AlreadyExists TrainingRuntime/TrainJob left by a crashed same-run retry instead of failing, matching the pattern already used for ComputeDomain and the RoCE ResourceClaimTemplate. Signed-off-by: Mike Cook <micook@nvidia.com>
3 participants
The NCCL all-reduce TrainJob/TrainingRuntime/ComputeDomain/RoCE-claim resources are applied by fixed name in the shared, persistent aicr-validation namespace, so two concurrent
aicr validateruns (or a crashed run and its retry) could delete or adopt each other's resources. This affects every NCCL leaf in the catalog (EFA, TCPXO, RoCE, NVLS across A100/H100/B200/GB200/GB300), not just one accelerator or fabric.Give each run its own namespace instead, mirroring the pattern inference-perf already uses (deriveRunID/ensureNamespace): every fixed resource name only has to be unique within its own namespace, so concurrent or crashed runs can never collide, adopt, or delete each other's resources. Cleanup deletes the namespace and waits for it to fully terminate (cascading GC for anything created in it) before returning, and now returns a real cleanup failure instead of only logging it, so a genuine cleanup failure fails the check.
Summary
Give each
aicr validateNCCL all-reduce run its own per-run namespace instead of the shared, persistentaicr-validationnamespace, so concurrent or crashed/retried runs can no longer collide, adopt, or delete each other's resources.Motivation / Context
The NCCL all-reduce TrainJob/TrainingRuntime/ComputeDomain/RoCE-claim resources were applied by fixed name in the shared
aicr-validationnamespace, so two concurrentaicr validateruns (or a crashed run and its retry) could delete or adopt each other's resources. This affects every NCCL leaf in the catalog (EFA, TCPXO, RoCE, NVLS across A100/H100/B200/GB200/GB300), not just one accelerator or fabric. Cleanup also only logged delete failures rather than returning them, letting a real cleanup failure disappear silently, and didn't wait for the namespace to actually finish terminating before reporting success.Fixes: N/A
Related: N/A
Type of Change
Component(s) Affected
cmd/aicr,pkg/cli)cmd/aicrd,pkg/server)pkg/recipe)pkg/bundler,pkg/component/*)pkg/collector,pkg/snapshotter)pkg/validator)pkg/errors,pkg/k8s)docs/,examples/)Implementation Notes
Mirrors the pattern
inference-perfalready uses (deriveRunID/ensureNamespace): every fixed resource name only has to be unique within its own namespace, so concurrent or crashed runs can never collide. Cleanup becomes a single namespace delete relying on Kubernetes cascading GC instead of tracking and UID-pinning a delete for each individual resource, via a rewrittencleanupNCCLResources(clientset, namespace) error.foldCleanupErroris now parameterized on its fallback message (previously hardcoded to the Trainer-specific string) so the same helper serves both the Trainer-install cleanup path and the new namespace-cleanup path without misattributing errors.Namespaces().Deleteonly starts asynchronous deletion, so cleanup also waits for it to actually finish via the samewaitForNamespaceGonehelperensureNamespacealready relies on on the create side — otherwise a successful benchmark could report clean teardown while the namespace (and the ComputeDomain/ResourceClaimTemplate/TrainJob finalizers cascading through it) was still terminating.Testing
make qualifypassed clean:make test-coverage: all packages pass with-race;validators/performanceat 63.2% (repo-wide 84.1%, threshold 80%)make lint(golangci-lint + yamllint): cleanmake tuning-check: cleanmake e2e(chainsaw,--no-cluster): 24/24 passed, 0 failed, 0 skippedmake scan(grype): no new vulnerabilities introduced by this changemake license-check: cleanmake api-diff: no incompatible SDK facade / transparent-alias changes since v0.20.0Added
TestCleanupNCCLResources_WaitsForFinalizerHeldNamespaceandTestWaitForNamespaceGone_TimesOutWhenNeverDeletedas regression guards for the wait-for-termination fix, plus updatedTestFoldCleanupError/TestFoldCleanupError_PreservesCleanupCodefor the newfallbackMsgparameter.Risk Assessment
Rollout notes: N/A — internal validator behavior only, no recipe/API/CLI surface change. Each run now creates/deletes an
aicr-nccl-perf-<runID>namespace instead of reusing the sharedaicr-validationnamespace; no action needed by recipe authors or operators.Checklist
make testwith-race)make lint)git commit -S) — GPG signing info