fix(operator): surface Blocked condition and event when non-interrupt… - #582
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… pods block drain Previously, when spec.podNonInterruptLabels held a node at the pre-drain barrier, the operator gave no indication why or which pods were responsible - administrators only saw Ready=False/Progressing indefinitely, with no way to tell a deliberate wait from a stuck node. - HasNonInterruptWork now returns the names of the blocking pods instead of discarding them. - EnsureNodeIsReadyForInterrupt sets a Blocked condition (reason NonInterruptPodsRunning) naming the blocking pods (up to ReadyConditionNodeListLimit, else a count with the full list logged at info level), and emits a single Warning event when the barrier is first entered - not on every reconcile pass. - The condition clears once the barrier lifts, without disturbing an unrelated Blocked condition set for another reason (e.g. DependencyUninstalled). - UpdateBlockedCondition no longer unconditionally clears all Blocked conditions regardless of reason, which previously caused this condition to flap every reconcile. Fixes NVIDIA#542 Signed-off-by: bharqav <bhargavpodapati28@gmail.com>
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📝 WalkthroughWalkthroughThe operator now lists matching Pending and Running pods at the Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Merge Risk: 🔵 Low · up to Some nodes may show missing or stale blocked status, but drain behavior itself remains intact. The fixes are localized and should be addressed before or shortly after merge. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In `@operator/api/nodewright/v1alpha1/nodewright_types.go`:
- Around line 48-49: Update the documentation for PodNonInterruptLabels to
describe its selector behavior and pre-drain barrier semantics: matching Pending
or Running pods block draining, keep the node cordoned, and are not bounded by
DrainConfig.Timeout; reference the NonInterruptPodsRunning condition and remove
the inaccurate “whether they Interruptible” wording.
In `@operator/config/crd/bases/nodewright.nvidia.com_nodewrights.yaml`:
- Around line 595-596: Update the podNonInterruptLabels API field description in
the CRD source to say matching Pending and Running pods block pre-drain progress
indefinitely, that spec.drainConfig.timeout does not apply, and that the
condition uses the corrected wording “whether they are interruptible”; then
regenerate the CRD so the generated schema reflects the complete barrier
contract.
In `@operator/internal/controller/skyhook_controller.go`:
- Line 3288: Update the blocked-pod barrier handling around the existing
condition predicate and Eventf call to track NonInterruptPodsRunning
independently of other Blocked reasons, preserving unrelated Blocked conditions
and recording the blocking pod names. Emit the Warning event only when entering
this barrier state, not on subsequent reconciles; add a regression test covering
a pre-existing DependencyUninstalled condition and two reconciles.
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docs/architecture/interrupt-flow.mdoperator/RELEASE_NOTES.mdoperator/api/nodewright/v1alpha1/nodewright_types.gooperator/config/crd/bases/nodewright.nvidia.com_nodewrights.yamloperator/internal/controller/cluster_state_v2.gooperator/internal/controller/skyhook_controller.gooperator/internal/controller/skyhook_controller_test.gooperator/internal/wrapper/skyhook_conditions.gooperator/internal/wrapper/skyhook_conditions_test.go
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…ed reason is active Addresses CodeRabbit review on PR NVIDIA#582 — the event was firing on every reconcile whenever an unrelated Blocked reason (e.g. DependencyUninstalled) already owned the condition slot, since the transition guard never resolved to false in that case. Also documents the full podNonInterruptLabels barrier contract per review feedback. Signed-off-by: bharqav <bhargavpodapati28@gmail.com>
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Thanks for taking #542 on — the reporting gap it describes is real, and naming the specific pods holding the barrier is genuinely more useful than what the issue asked for, which only proposed naming nodes.
Before anything else: the red CI is not your change. e2e/interrupt (k8s-1.33.12) died during cluster setup — curl: (35) Recv failure: Connection reset by peer followed by No such container: kind-registry — so the job never reached chainsaw, and ci-gate just aggregates it. Worth a re-run rather than investigation.
The main thing I would like reconsidered is the choice of condition type, because most of what follows is downstream of it.
The design in #542
The issue is unusually prescriptive, and asks for three things this PR does differently:
- Condition type
DrainBlocked, shared with #541, with the explicit note that whichever lands second "should not introduce a parallel type". This PR writes toBlocked, which already carries reasonDependencyUninstalled. Two independent writers now contend for one slot, and that collision is exactly why the PR needs the suppression guard at line 3288 and theUpdateBlockedConditioncarve-out. - An aggregate message naming nodes:
"1/5 nodes waiting on non-interruptible pods (node-b); default/trainer-7 matches podNonInterruptLabels", withReadyConditionNodeListLimitapplied to nodes. This PR writes a per-node message listing pods, and applies that limit to pods. - The condition as the deliverable, with the event "a reasonable addition" — and a specific warning that events default to a 1h TTL while this wait "can outlast them by orders of magnitude". Most of the complexity budget here went into emit-once event semantics instead, and those do not hold (see 2 below).
Blocking
1. The Blocked condition can strand True forever
UpdateBlockedCondition runs every reconcile via refreshSkyhookConditions (skyhook_controller.go:608) and previously cleared Blocked unconditionally. With the carve-out at cluster_state_v2.go:617, the only remaining clear is RemoveSkyhookConditionTypeAndReason inside EnsureNodeIsReadyForInterrupt, reachable only from the interrupt path at line 3194.
Set nodewright.nvidia.com/pause while a node sits at the barrier: Reconcile short-circuits on IsPaused and processSkyhooksPerNode skips the Skyhook, so nothing clears it. The pods finish, the Skyhook is resumed and completes, and .status.conditions[Blocked]=True remains — which projects to Ready=False / Blocked permanently. Same outcome if the node is deleted or relabelled out of spec.nodeSelector.
That is a worse outcome than the bug being fixed: #542's complaint is an unexplained Ready=False, and this can produce a confidently wrong one.
2. One cluster-scoped condition slot, written per node
addOrUpdateSkyhookCondition matches on Type only, so a NodeWright holds exactly one Blocked condition, but EnsureNodeIsReadyForInterrupt runs per node.
With a budget of 2: node-a is held and sets the condition; node-b is not held, falls through to the clear at line 3317, and deletes node-a's condition in the same pass. Next pass existing == nil again, so a fresh Warning event is emitted — every 2s, indefinitely, which is the opposite of the stated behavior. If both nodes are blocked instead, the message is overwritten by whichever node is visited last, so Updated=true every pass and the operator patches status every 2s with a message flapping between nodes.
The new tests are entirely single-node — every spec uses node-a, with no second node anywhere — which is why this passes.
3. Pod names are reported without their namespace
r.dal.GetPods is called with only client.MatchingLabelsSelector and client.MatchingFields{fieldSelectorNodeName} (lines 2418-2423), no client.InNamespace, so podNonInterruptLabels matches across every namespace. Two pods named worker-0 in team-a and team-b both on the node produce Pods [worker-0, worker-0] are running. Waiting., which identifies neither. DrainNode in the same file formats pods as [%s:%s] with namespace (line 2540), so this also breaks the file's own convention, and sort.Strings on bare names interleaves namespaces.
Should fix
4. The message never names the node
message is built from pod names only. On a 200-node NodeWright, kubectl get nodewright x -o yaml shows Blocked / NonInterruptPodsRunning: "Pod [trainer-0] is running. Waiting." with no node reference and Ready still reporting Progressing. The node name lives only in the event, which is the artifact #542 specifically says not to depend on. The Ready message already does this well — 2 blocked (node-a, node-b).
5. The regenerated CRD was not mirrored into the chart — two files
operator/config/crd/bases/nodewright.nvidia.com_nodewrights.yaml has the new three-line description, but chart/templates/nodewright-crd.yaml:590 and chart/templates/skyhook-crd.yaml:571 both still read "monitor pods for whether they Interruptible". Helm is the distributed install path, so installed clusters get stale kubectl explain output for the very field this PR documents. AGENTS.md: "operator/config/ ↔ chart/ must stay in sync ... Any change to one must be mirrored into the other in the same PR."
6. The Warning event is not emitted on the Node
DrainNode emits DrainTimeout twice — on skyhookNode.GetNode() (2488) and on the NodeWright (2496). The barrier event only does the latter, so an admin running kubectl describe node node-a, the obvious first step for a node that is cordoned and not progressing, sees nothing.
7. The truncation log fires every pass, per node, per package
EnsureNodeIsReadyForInterrupt is called once per (node, interrupting package) per reconcile, and the loop requeues at 2s while blocked. 50 held nodes and 2 interrupting packages is ~100 Info lines every 2 seconds, each carrying the full pod slice. The analogous Ready-condition truncation log (cluster_state_v2.go:912) fires at most once per pass for the whole Skyhook.
Smaller
FindSkyhookConditionalready exists upstream.operator/vendor/k8s.io/apimachinery/pkg/api/meta/conditions.go:91providesFindStatusCondition(conditions, conditionType) *metav1.Conditionwith identical semantics — the call ismeta.FindStatusCondition(skyhook.Status.Conditions, conditionType). Separately,RemoveSkyhookConditionTypeAndReasonduplicatesRemoveSkyhookConditionTypesin full (same nil guard, same[:0]compaction, sameUpdatedbookkeeping) and differs only in the predicate; oneremoveSkyhookConditionsFunc(skyhook, func(metav1.Condition) bool)with both exported wrappers collapses them. Note also that returning a live pointer intoStatus.Conditionslets a caller mutate a condition without settingUpdated, so the change would silently never be patched.if _package != nilis unreachable.ProcessInterruptdereferences the package on its first line (skyhookNode.HasInterrupt(*_package), line 3150) before calling through at 3194, so nil panics long before this branch. If it were taken the event would readpackage [:].DrainNodeat 2505 uses the fields directly without a guard.ReadyConditionNodeListLimitis a node cap being used as a pod cap. Tuning it for Ready's node lists silently changes pod truncation here, and the two have different size characteristics since one node can run dozens of matching pods. AnonInterruptPodListLimitnext to its owner, or a kind-agnostic rename, would fix it.- The
UpdateBlockedConditioncarve-out needs a why-comment. It encodes a cross-file invariant — a second writer inskyhook_controller.gonow owns this slot — that is invisible fromcluster_state_v2.go. The next person reasonably simplifies it back to the unconditional remove and silently reintroduces the wipe. The function's own doc comment also still says it clears the condition whenever nothing is blocking.
Docs
docs/architecture/operator-status.md— the new reason is absent from "Other Condition Types", and theReadytable still says blocked is caused only "by taint toleration or ignored nodes".Blockedwas already undocumented there before this PR, so this is an inherited gap rather than one you created, but this change is what makes it user-visible.docs/architecture/interrupt-flow.md— #542 asks the paragraph to state three things; the PR covers "unbounded" and "timeout does not apply" but omits the node stays cordoned throughout.Cordon()runs before the barrier check, so a node can sit unschedulable indefinitely, which is the fact an admin most needs when deciding whether to intervene.
Tests
Every new spec is single-node and mutates the in-memory wrapper without round-tripping through the apiserver, so findings 1, 2 and 3 are all invisible to the suite. A two-node case — one held at the barrier, one not — would catch 2 directly, and is worth adding whichever way the condition-type question is resolved.
…le pass Addresses ayuskauskas's review on PR NVIDIA#582. The prior per-node approach let EnsureNodeIsReadyForInterrupt read-modify-write a single shared Blocked condition once per node per reconcile, causing three real bugs: an unblocked node could clobber a blocked node's condition and re-trigger its Warning event every pass; a paused, deleted, or deselected node could leave the condition permanently stuck True since only the per-node path ever cleared it; and blocking pod names were reported without their namespace. - updateDrainBlockedCondition now runs once per reconcile pass in refreshSkyhookConditions, computing the full set of currently-blocked nodes fresh from live state and writing a single aggregate condition and at most one Warning event per genuine transition into the blocked state. - EnsureNodeIsReadyForInterrupt no longer touches the shared condition; it still gates per-node drain and now also emits a supplementary Warning event on the Node object itself, matching the existing DrainTimeout convention. - HasNonInterruptWork now reports pod names as namespace/name. - Collapsed RemoveSkyhookConditionTypeAndReason into RemoveSkyhookConditionTypes via a shared predicate helper, and replaced FindSkyhookCondition with the existing upstream meta.FindStatusCondition. - Mirrored the CRD field description into chart/templates, documented the Blocked/NonInterruptPodsRunning reason and the cordon-persists-throughout behavior, and updated RELEASE_NOTES.md to match the new aggregate behavior. - Added a two-node envtest regression covering the exact contention bug: one blocked node, one unblocked, across multiple reconcile passes, including coexistence with an unrelated DependencyUninstalled condition. Signed-off-by: bharqav <bhargavpodapati28@gmail.com>
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Inline comments:
In `@operator/internal/controller/skyhook_controller.go`:
- Line 3390: Bound the pod-name list used in the Node Warning event message to
ReadyConditionNodeListLimit, matching the existing node-list display behavior.
When truncation occurs, log the complete sorted pod list separately, while
keeping the event message limited to the configured display size; update the
code around the strings.Join(podNames, ", ") call.
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chart/templates/nodewright-crd.yamlchart/templates/skyhook-crd.yamldocs/architecture/interrupt-flow.mddocs/architecture/operator-status.mdoperator/RELEASE_NOTES.mdoperator/internal/controller/cluster_state_v2.gooperator/internal/controller/skyhook_controller.gooperator/internal/controller/skyhook_controller_test.gooperator/internal/wrapper/skyhook_conditions.gooperator/internal/wrapper/skyhook_conditions_test.go
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Cap the pod list in the Node-level Warning event emitted from EnsureNodeIsReadyForInterrupt at wrapper.ReadyConditionNodeListLimit, matching the existing truncation behavior in updateDrainBlockedCondition. The full sorted pod list is logged at info level when truncation occurs. Addresses CodeRabbit finding on PR NVIDIA#582. Signed-off-by: bharqav <bhargavpodapati28@gmail.com>
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Inline comments:
In `@operator/internal/controller/skyhook_controller.go`:
- Line 3394: Pass the transition result from updateDrainBlockedCondition through
EnsureNodeIsReadyForInterrupt and gate the Node Warning Eventf so it is emitted
only when a new NonInterruptPodsRunning barrier transition occurs. Preserve
existing behavior otherwise, and add regression coverage for repeated reconciles
with unchanged matching pods and for an unrelated Blocked reason.
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The unit-tests (k8s-1.37.0) failure is in HandleRuntimeRequired... manually uncordoned (skyhook_controller_test.go:1905), a pre-existing test from #401 unrelated to this PR's changes, none of this PR's diff touches that code path. It's a 409 Conflict from the test's direct client.Patch racing the live controller manager's background reconcile on the same Node object, a known class of envtest timing flake. Main's recent CI history shows this test passing consistently. Could someone with access re-run the failed job? Happy to investigate further if it recurs. |
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Inline comments:
In `@operator/internal/controller/cluster_state_v2.go`:
- Around line 620-623: Update the cleanup logic around existing and
wrapper.SkyhookConditionBlocked to inspect both the unprefixed and
nodewright.nvidia.com/Blocked condition types. Remove both condition types
whenever neither matching condition has reason NonInterruptPodsRunning,
including when only the prefixed condition exists.
In `@operator/internal/controller/skyhook_controller.go`:
- Around line 627-630: Update nodeNeedsInterruptDrain and its call from
updateDrainBlockedCondition to accept and reuse the logger, and log the error
returned by node.RunNext before returning false; preserve the existing
empty-toRun behavior while ensuring dependency-graph validation failures are
recorded during evaluation.
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chart/templates/nodewright-crd.yamlchart/templates/skyhook-crd.yamldocs/architecture/operator-status.mdoperator/config/crd/bases/nodewright.nvidia.com_nodewrights.yamloperator/internal/controller/cluster_state_v2.gooperator/internal/controller/skyhook_controller.gooperator/internal/controller/skyhook_controller_test.go
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nodeNeedsInterruptDrain previously treated a RunNext() error identically to an empty task list, silently returning false with no trace. This could cause a node with a real dependency-graph error to be silently excluded from the NonInterruptPodsRunning aggregate, in reconcile paths (paused, disabled, node-picker skip) that never reach RunSkyhookPackages' own error handling for the same call in the same pass. Now logs the error via log.FromContext before returning false, matching this file's existing logging conventions. Addresses CodeRabbit finding on PR NVIDIA#582. Signed-off-by: bharqav <bhargavpodapati28@gmail.com>
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One more doc fix before this goes in, and then I think we're done.
That last clause is the opposite of what this PR establishes. Your new CRD description and Please correct it in this PR rather than a follow-up. It is the same contract the change is documenting, and leaving the two pages disagreeing is worse than either one alone. On the condition type: I raised Thanks for staying with this one through a long review. |
…tLabels barrier custom-resource.md incorrectly suggested pairing this barrier with drainConfig.timeout to bound the wait. The barrier is unbounded by design: EnsureNodeIsReadyForInterrupt returns before DrainNode is ever reached while non-interrupt pods are running, so drainStart_ (written only inside StartDrain, called only from DrainNode) is never set and no timeout clock exists. Corrected to match the existing, accurate wording already used in docs/architecture/interrupt-flow.md and the CRD field description. Addresses review feedback on PR NVIDIA#582. Signed-off-by: bharqav <bhargavpodapati28@gmail.com>
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Fixed, pushed in eb774a1. Replaced the drainConfig.timeout clause with "This wait is unbounded and drain timeout does not apply," matching the CRD description and interrupt-flow.md now. Also updated the branch with main. Thanks for the thorough review on this one, appreciate you sticking with it. |
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Approving at 8c0acac9.
CI is fully green — the complete e2e matrix (core, interrupt, lifecycle, uninstall across k8s 1.34.11 / 1.35.8 / 1.36.4 / 1.37.0), plus unit-tests, helm-tests, migration, operator-agent, cli-e2e and deployment-policy. No failures. The HandleRuntimeRequired flake you flagged in #582 didn't recur.
The doc fix in eb774a16 is correct — docs/user-guide/custom-resource.md now says the wait is unbounded and drain timeout does not apply, matching the CRD description and docs/architecture/interrupt-flow.md:168.
I also gave the diff a security read, since this touches the interrupt path. Nothing of concern: no network calls, no os/exec, no environment or secret access, no file writes, no RBAC or kubebuilder permission markers changed, and no dependency, vendor, chart-values, Dockerfile or workflow changes. The only two new imports are k8s.io/apimachinery/pkg/api/meta and strings, both already vendored. The change is confined to condition and event bookkeeping.
Nice use of meta.FindStatusCondition and the collapsed removeSkyhookConditions predicate helper — both read better than what I'd sketched.
Thanks for the persistence on this one.
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Fixes #542
Description
Surfaces a
Blockedcondition (reasonNonInterruptPodsRunning) and a Warning event whenspec.podNonInterruptLabelsholds a node at the pre-drain barrier, so administrators can seewhy a node is stuck and which pods are responsible, instead of an unexplained
Ready=False/Progressingwith no further signal.HasNonInterruptWorknow returns the names of the blocking pods instead of discarding them.EnsureNodeIsReadyForInterruptsets the condition (naming the blocking pods, up toReadyConditionNodeListLimit, else a count with the full list logged at info level) andemits a single Warning event when the barrier is first entered — not on every reconcile pass.
Blockedcondition set for another reason (e.g.
DependencyUninstalled).UpdateBlockedConditionunconditionally clearing allBlockedconditions regardlessof reason, which was previously wiping this condition out on every reconcile.
Testing: extended the existing controller test to assert the condition, event, clearing
behavior, and preservation of an unrelated
Blockedcondition. Fullinternal/controllerandinternal/wrappersuites pass, including with-race. Verified live against a real envtestapiserver — condition appears with correct pod names, exactly one event fires across multiple
reconcile cycles, and the condition clears when the blocking pod is removed.
golangci-lintclean; CRD manifests regenerated and in sync.
Checklist
git commit -s -S.