Add StatefulSet reconciler unit test for resize after scale-to-zero by kavix · Pull Request #15319 · kubernetes-sigs/kueue

kavix · 2026-09-09T08:02:38Z

What type of PR is this?

/kind cleanup
/area testing

What this PR does / why we need it?

Follow-up to #15279: adds unit-test coverage for the StatefulSet reconciler when scaling down to zero and then scaling up to a different replica count, ensuring the Workload PodSet count is updated before the hold is released.

Useful notes for your reviewer

Validates the reconciler behavior in pkg/controller/jobs/statefulset/statefulset_reconciler_test.go without requiring the integration test suite.

Release note

NONE

AI summary

Adds StatefulSet reconciler unit tests for scaling from zero to five replicas.
Verifies the Workload PodSet count updates before the Workload leaves hold.
Covers both UnadmittedWorkloadsObservability settings.

Suggested release note

NONE

This change adds unit-test coverage only. It does not change user-facing behavior.

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kubernetes-prow · 2026-09-09T08:02:57Z

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kavix
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coderabbitai · 2026-09-09T08:03:15Z

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pkg/controller/jobs/statefulset/statefulset_reconciler_test.go

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📝 Walkthrough

Walkthrough

The StatefulSet reconciler tests now cover scaling a held workload from zero to five replicas. They verify that the Workload PodSet count updates before hold release and check the conditions with observability enabled and disabled.

Changes

StatefulSet resize validation

Layer / File(s)	Summary
Scale-up resize reconciliation test `pkg/controller/jobs/statefulset/statefulset_reconciler_test.go`	Adds cases for zero-to-five replica scaling. The tests check that the PodSet count reaches five while the Workload remains on hold, then verify the conditions for both observability settings. The test harness supports client interceptors and a second reconcile. It also ignores condition transition timestamps during comparisons.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 5138b

This change adds regression tests for StatefulSet scale-up ordering and does not alter runtime behavior. It is low risk to merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: adding a StatefulSet reconciler unit test for resizing after scaling to zero.
Linked Issues check	✅ Passed	The change satisfies issue `#15300`. It adds two table cases in `pkg/controller/jobs/statefulset/statefulset_reconciler_test.go`. Each case reconciles a StatefulSet at 0 replicas, updates it to 5 replic…
Out of Scope Changes check	✅ Passed	The changes stay within issue `#15300`. The client interceptor, second-reconcile setup, condition timestamp comparison option, and feature-gate case support the required StatefulSet resize test. No unre…

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kavix · 2026-09-09T08:05:00Z

/ok-to-test

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Inline comments:
In `@pkg/controller/jobs/statefulset/statefulset_reconciler_test.go`:
- Line 255: Update the “should resize workload podSets when StatefulSet scales
up from zero” test to reconcile the StatefulSet at zero replicas first, then
change replicas to 5 and reconcile again. Record Workload writes and assert the
PodSet Count: 5 update occurs before WorkloadOnHold is cleared, while retaining
the final Workload state assertions.

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pkg/controller/jobs/statefulset/statefulset_reconciler_test.go

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tenzen-y · 2026-09-12T14:32:00Z

/test pull-kueue-test-e2e-dra-baseline-main
/test pull-kueue-test-e2e-dra-capacity-main

mbobrovskyi · 2026-09-14T16:55:53Z

 			},
 		},
+		"should resize workload podSets when StatefulSet scales up from zero": {
+			featureGates: map[featuregate.Feature]bool{features.TopologyAwareScheduling: false},


Suggested change

featureGates: map[featuregate.Feature]bool{features.TopologyAwareScheduling: false},

mbobrovskyi · 2026-09-14T16:56:41Z

+		},
+		"should resize workload podSets when StatefulSet scales up from zero with UnadmittedWorkloadsObservability disabled": {
+			featureGates: map[featuregate.Feature]bool{
+				features.TopologyAwareScheduling:          false,


Suggested change

features.TopologyAwareScheduling: false,

mbobrovskyi · 2026-09-14T16:58:51Z

+				UID("sts-uid").
+				Queue("lq").
+				Replicas(5).
+				DeepCopy(),


Suggested change

DeepCopy(),

Obj(),

mbobrovskyi · 2026-09-14T16:58:59Z

+				UID("sts-uid").
+				Queue("lq").
+				Replicas(5).
+				DeepCopy(),


Suggested change

DeepCopy(),

Obj(),

mbobrovskyi · 2026-09-14T17:11:58Z

+		wantEvents                  []utiltesting.EventRecord
+		wantErr                     error
+		interceptorFuncs            interceptor.Funcs
+		statefulSetForNextReconcile *appsv1.StatefulSet


I'm not sure I fully understand the reason for this. Would it be possible to keep only the statefulSet and split the test into two cases: scaling down to zero and another one scaling back up from zero? I think that might keep the test simpler.

mbobrovskyi · 2026-09-14T17:15:30Z

+				Update: func(ctx context.Context, c client.WithWatch, obj client.Object, opts ...client.UpdateOption) error {
+					if w, ok := obj.(*kueue.Workload); ok {
+						if len(w.Spec.PodSets) > 0 && w.Spec.PodSets[0].Count == 5 && workload.IsOnHold(w) {
+							updatedBeforeHoldReleased.Store(true)
+						}
+					}
+					return c.Update(ctx, obj, opts...)
+				},
+			},


What exactly are we trying to verify here? Would it be sufficient to check that the workload conditions have been updated?

Signed-off-by: kavix <kavix@yahoo.com>

kubernetes-prow · 2026-10-06T09:59:21Z

PR needs rebase.

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kubernetes-prow Bot added release-note-none Denotes a PR that doesn't merit a release note. kind/cleanup Categorizes issue or PR as related to cleaning up code, process, or technical debt. area/testing Testing - related stuff labels Sep 9, 2026

kubernetes-prow Bot added the cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. label Sep 9, 2026

kubernetes-prow Bot requested review from amy and kannon92 September 9, 2026 08:02

kubernetes-prow Bot added the size/L Denotes a PR that changes 100-499 lines, ignoring generated files. label Sep 9, 2026

kubernetes-prow Bot added the ok-to-test Indicates a non-member PR verified by an org member that is safe to test. label Sep 9, 2026

mimowo reviewed Sep 9, 2026

View reviewed changes

Comment thread pkg/controller/jobs/statefulset/statefulset_reconciler_test.go Outdated

kavix force-pushed the test-sts-resize-scale-to-zero branch from 6a2bc9b to 3ca7fb9 Compare September 9, 2026 08:10

kavix requested a review from mimowo September 9, 2026 08:12

coderabbitai Bot reviewed Sep 9, 2026

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Comment thread pkg/controller/jobs/statefulset/statefulset_reconciler_test.go

kavix force-pushed the test-sts-resize-scale-to-zero branch from 3ca7fb9 to bc0adaf Compare September 9, 2026 08:30

mbobrovskyi reviewed Sep 14, 2026

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kubernetes-prow Bot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Sep 14, 2026

Add StatefulSet reconciler unit test for resize after scale-to-zero

5138b58

Signed-off-by: kavix <kavix@yahoo.com>

kavix force-pushed the test-sts-resize-scale-to-zero branch from bc0adaf to 5138b58 Compare September 29, 2026 06:33

kubernetes-prow Bot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Sep 29, 2026

kubernetes-prow Bot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Oct 6, 2026

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