fix(validator): reject incompatible StorageClass before model-cache PVC create - #2452
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fix(validator): reject incompatible StorageClass before model-cache PVC create#2452mikecook wants to merge 5 commits into
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Included review availability: Your plan provides up to 12 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughThe inference workload configuration now stores the selected GPU node instance type. Model-cache validation resolves explicit or default StorageClasses, supports current and legacy default annotations, and selects the newest default. It parses machine families, validates storage compatibility for GKE Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to The change adds a localized pre-flight validation that fails incompatible StorageClass and GPU-node combinations early with actionable remediation; no actionable merge-blocking risk remains beyond normal checks and review. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Actionable comments posted: 1
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Inline comments:
In `@validators/performance/model_cache.go`:
- Around line 283-315: Update the PVC creation logic after the StorageClass
resolution and compatibility check to use resolvedSC.Name when explicitSC is
empty, pinning the validated default StorageClass; continue using explicitSC
unchanged for explicit overrides.
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validators/performance/inference_perf_constraint.govalidators/performance/model_cache.govalidators/performance/model_cache_test.go
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…VC create Some GPU node families can only attach a subset of a CSI provisioner's disk types (e.g. GKE's a4x-highgpu-4g nodes reject Persistent Disk entirely, including pd-balanced, and need Hyperdisk instead). Without a pre-flight check, the inference-perf model-cache PVC binds to an incompatible StorageClass and the workload just sits Pending until the populate-Job timeout, with no indication of the real cause. Add a rule-table (storageCompatibilityRules) keyed by provisioner and machine family, and check the cache PVC's resolved StorageClass (explicit override or cluster default) against the chosen node's instance-type family before creating it. An incompatible combination now fails immediately with the concrete remediation instead of a slow, opaque timeout. The table is provisioner/family-driven so a future incompatibility on another cloud can be added without touching the check logic itself. Also select the effective default StorageClass by CreationTimestamp when more than one is annotated default, matching the cluster's own DefaultStorageClass admission controller tie-break, and accept parameters.type=dynamic for GKE's pd.csi.storage.gke.io driver on a4x nodes alongside the hyperdisk- prefix, since dynamic always resolves to Hyperdisk on a node family that can't attach Persistent Disk. Signed-off-by: Mike Cook <micook@nvidia.com>
The pre-flight check validated the cluster-default StorageClass resolved at list time, but PVC creation still left StorageClassName nil when there was no explicit override, letting Kubernetes re-resolve the default at admission. If the cluster default changed between the check and admission, an unvalidated (possibly incompatible) StorageClass could bind, reintroducing the Pending / attach failure this preflight exists to prevent. Pin the PVC to resolvedSC.Name when the StorageClass was implicit; explicit overrides are unaffected. Signed-off-by: Mike Cook <micook@nvidia.com>
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🤖 Prompt for all review comments with AI agents
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@validators/performance/model_cache.go`:
- Around line 249-252: The validation error constructed in the model-cache
compatibility check must state that StorageClass parameters.type set to dynamic
is also valid, alongside types beginning with rule.compatibleTypePrefix. Update
the remediation text in the errors.New call without changing the validation
logic or other guidance.
- Line 221: Update the return block in the relevant model-cache function so the
rationale is in a normal comment before the lint directive, and place the
standalone //nolint:nilnil directive immediately before return best, nil.
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validators/performance/model_cache.govalidators/performance/model_cache_test.go
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Directive-shaped comments must be self-contained: put the rationale in a normal comment before the directive, not trailing it on the same line as the guarded return. No functional change. Signed-off-by: Mike Cook <micook@nvidia.com>
The compatibility-check error only told operators to pick a parameters.type starting with compatibleTypePrefix, omitting that autoSelectType (e.g. GKE's "dynamic") is also accepted. Build the type guidance from the rule so it stays correct as new provisioner/family rules are added to the table. Signed-off-by: Mike Cook <micook@nvidia.com>
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Some GPU node families can only attach a subset of a CSI provisioner's disk types (e.g. GKE's a4x-highgpu-4g nodes reject Persistent Disk entirely, including pd-balanced, and need Hyperdisk instead). Without a pre-flight check, the inference-perf model-cache PVC binds to an incompatible StorageClass and the workload just sits Pending until the populate-Job timeout, with no indication of the real cause.
Add a rule-table (storageCompatibilityRules) keyed by provisioner and machine family, and check the cache PVC's resolved StorageClass (explicit override or cluster default) against the chosen node's instance-type family before creating it. An incompatible combination now fails immediately with the concrete remediation instead of a slow, opaque timeout. The table is provisioner/family-driven so a future incompatibility on another cloud can be added without touching the check logic itself.
Also select the effective default StorageClass by CreationTimestamp when more than one is annotated default, matching the cluster's own DefaultStorageClass admission controller tie-break, and accept parameters.type=dynamic for GKE's pd.csi.storage.gke.io driver on a4x nodes alongside the hyperdisk- prefix, since dynamic always resolves to Hyperdisk on a node family that can't attach Persistent Disk.
Summary
Adds a pre-flight StorageClass compatibility check before creating the inference-perf model-cache PVC, so an incompatible GPU-node/StorageClass combination (e.g. GKE a4x nodes + Persistent Disk) fails fast with a concrete remediation instead of silently sitting Pending until the populate-Job timeout.
Motivation / Context
Some GPU node families can only attach a subset of a CSI provisioner's disk types — GKE's a4x-highgpu-4g nodes reject Persistent Disk entirely (including pd-balanced) and require Hyperdisk instead. Without a pre-flight check, the model-cache PVC binds to an incompatible StorageClass and the workload just hangs until the populate-Job timeout, giving no indication of the real cause.
Fixes: N/A
Related: N/A
Type of Change
Component(s) Affected
pkg/validator)Implementation Notes
Adds a storageCompatibilityRules table keyed by CSI provisioner and GPU-node machine family, checked against the cache PVC's resolved StorageClass (explicit override or cluster default) before the PVC is created. The table is provisioner/family-driven, so a future incompatibility on another cloud can be added as a new table entry without touching the check logic.
Two related fixes bundled in because they affect resolving the "effective" StorageClass correctly:
Testing
All stages passed (test-coverage, lint, tuning-check, coverage-check, e2e, scan, license-check, api-diff). validators/performance package coverage: 62.1%. scan surfaced only pre-existing low/unknown-severity findings unrelated to this change (GO-2025-3547 low, GO-2026-5932 unknown) — no new highs.
Risk Assessment
Rollout notes: N/A — pure validator-side pre-flight check; no config/flag changes, no migration. A currently-passing combination remains unaffected; only combinations already destined to time out now fail fast with a clear message instead.
Checklist
make testwith-race)make lint)git commit -S)