test(e2e): add simple stress test suite

.github/workflows/test.yml

@@ -58,6 +58,52 @@ jobs:
           if-no-files-found: ignore
           retention-days: 1
 
+  test-stress:
+    name: E2E Stress Tests
+    strategy:
+      fail-fast: true
+      matrix:
+        include:
+          - profile: short
+            steps: 5
+            interval: 5s
+          - profile: long
+            steps: 15
+            interval: 10s
+
+    runs-on: ubuntu-latest
+    env:
+      TEST_E2E_DIAGNOSTIC_REPORT_PATH: ${{ github.workspace }}/test-report
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      - run: go mod tidy
+
+      - run: make test-e2e-stress
+        env:
+          TEST_E2E_STRESS_STEPS: ${{ matrix.steps }}
+          TEST_E2E_STRESS_STEP_INTERVAL: ${{ matrix.interval }}
+
+      - uses: actions/upload-artifact@v4
+        if: failure()
+        with:
+          name: test-report-stress-${{ matrix.profile }}
+          path: ${{ env.TEST_E2E_DIAGNOSTIC_REPORT_PATH }}
+          if-no-files-found: ignore
+
+      - run: go tool covdata textfmt -i /tmp/kind/data/emqx-operator-system/test-e2e-coverage -o ${{ github.workspace }}/cover.stress.out
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: coverprofile-stress-${{ matrix.profile }}
+          path: ${{ github.workspace }}/cover.stress.out
+          if-no-files-found: ignore
+          retention-days: 1
+
   test-upgrade:
     name: E2E Upgrade Tests - ${{ matrix.profile }}
     strategy:

Makefile

@@ -82,24 +82,31 @@ lint-fix: golangci-lint ## Run golangci-lint linter and perform fixes
 TEST_E2E_UPGRADE_IMAGE_INITIAL ?= emqx/emqx:5.10.2
 TEST_E2E_UPGRADE_IMAGE_UPGRADE ?= emqx/emqx:6.1.0
 
+TEST_E2E_STRESS_STEPS ?= 8
+TEST_E2E_STRESS_STEP_INTERVAL ?= 5s
+TEST_E2E_STRESS_IMAGE ?= emqx/emqx:6.1.0
+
 .PHONY: test
 test: manifests generate fmt vet envtest ## Run tests.
 	KUBEBUILDER_ASSETS="$(shell $(ENVTEST) use $(ENVTEST_K8S_VERSION) --bin-dir $(LOCALBIN) -p path)" go test -v $$(go list ./... | grep -v /e2e) -coverprofile ./cover.out
 
-# TODO(user): To use a different vendor for e2e tests, modify the setup under 'tests/e2e'.
-# The default setup assumes Kind is pre-installed and builds/loads the Manager Docker image locally.
-# Prometheus and CertManager are installed by default; skip with:
-# - PROMETHEUS_INSTALL_SKIP=true
-# - CERT_MANAGER_INSTALL_SKIP=true
+# Prometheus is installed by default; skip with:
+# - TEST_E2E_SKIP_PROMETHEUS_INSTALL=true
 .PHONY: test-e2e
 test-e2e: manifests generate e2e-test-cluster ## Run general E2E tests. Expected an isolated environment using Kind.
 	go test ./test/e2e/ -v -ginkgo.v -timeout 60m
 
 test-e2e-upgrade: manifests generate e2e-test-cluster ## Run E2E upgrade tests. Expected an isolated environment using Kind.
-	go test ./test/e2e/ -v -ginkgo.v -timeout 20m -ginkgo.focus="EMQX Upgrade Test" \
+	go test ./test/e2e/upgrade -v -ginkgo.v -timeout 20m \
 		-emqx-image-initial=$(TEST_E2E_UPGRADE_IMAGE_INITIAL) \
 		-emqx-image-upgrade=$(TEST_E2E_UPGRADE_IMAGE_UPGRADE)
 
+test-e2e-stress: manifests generate e2e-test-cluster ## Run E2E stress tests. Expected an isolated environment using Kind.
+	go test ./test/e2e/stress -v -ginkgo.v -timeout 20m \
+		-stress-steps=$(TEST_E2E_STRESS_STEPS) \
+		-step-interval=$(TEST_E2E_STRESS_STEP_INTERVAL) \
+		-emqx-image=$(TEST_E2E_STRESS_IMAGE)
+
 .PHONY: test-e2e-helm
 test-e2e-helm: e2e-test-cluster ## Run Helm chart E2E tests. Expected an isolated environment using Kind.
 	go test ./test/e2e-helm/ -v -ginkgo.v -timeout 20m
@@ -143,11 +150,11 @@ doc-crd-v3: ## Generate documentation for the `apps.emqx.io/v3beta1` CRD.
 # (i.e. docker build --platform linux/arm64). However, you must enable docker buildKit for it.
 # More info: https://docs.docker.com/develop/develop-images/build_enhancements/
 .PHONY: docker-build
-docker-build: ## Build docker image with the manager.
+docker-build: generate ## Build docker image with the manager.
 	$(CONTAINER_TOOL) build -t ${OPERATOR_IMAGE} .
 
 .PHONY: docker-build-coverage
-docker-build-coverage: Dockerfile.coverage ## Build docker image with the manager and code coverage enabled.
+docker-build-coverage: Dockerfile.coverage generate ## Build docker image with the manager and code coverage enabled.
 	$(CONTAINER_TOOL) build -t ${OPERATOR_IMAGE} -f Dockerfile.coverage .
 
 .PHONY: docker-push
@@ -162,7 +169,7 @@ docker-push: ## Push docker image with the manager.
 #   OPERATOR_IMAGE=<myregistry/image:<tag>> then the export will fail)
 PLATFORMS ?= linux/arm64,linux/amd64
 .PHONY: docker-buildx
-docker-buildx: Dockerfile.cross ## Build and push docker image for the manager for cross-platform support
+docker-buildx: Dockerfile.cross generate ## Build and push docker image for the manager for cross-platform support
 	- $(CONTAINER_TOOL) buildx create --name emqx-operator-builder
 	$(CONTAINER_TOOL) buildx use emqx-operator-builder
 	- $(CONTAINER_TOOL) buildx build --push --platform=$(PLATFORMS) --tag ${OPERATOR_IMAGE} -f Dockerfile.cross .

internal/controller/load_state.go

@@ -151,16 +151,6 @@ func (r *reconcileState) updateReplicantSet(instance *crd.EMQX) *appsv1.ReplicaS
 	return nil
 }
 
-// partOfReplicantSets checks if a pod belongs to any replicant ReplicaSet.
-func (r *reconcileState) partOfReplicantSet(pod *corev1.Pod) bool {
-	for _, rs := range r.replicantSets {
-		if util.IsPodManagedBy(pod, rs) {
-			return true
-		}
-	}
-	return false
-}
-
 // outdatedReplicantReplicaSets returns all replicant ReplicaSets except the update revision set,
 // sorted by creation timestamp (oldest first).
 func (r *reconcileState) outdatedReplicantSets(instance *crd.EMQX) []*appsv1.ReplicaSet {

internal/controller/sync_core_set.go

@@ -372,27 +372,28 @@ func (s *syncCoreSet) startEvacuation(
 // migrationTargetNodes returns the list of EMQX nodes to migrate workloads to.
 // * In core-only cluster, targets are pods of the core set.
 // * In core-replicant cluster, targets are:
-//   - pods in the "update" replicant set, if it has at least 1 ready replica,
+//   - pods in the "update" replicant set, if it has at least 1 node up and running,
 //   - pods in any replicant set otherwise.
 func migrationTargetNodes(r *reconcileRound, instance *crd.EMQX) []string {
 	targets := []string{}
+	fallback := []string{}
 	if instance.Spec.HasReplicants() {
 		updateReplicantSet := r.state.updateReplicantSet(instance)
 		if updateReplicantSet == nil {
 			return targets
 		}
-		updateReady := updateReplicantSet.Status.ReadyReplicas > 0
 		for _, node := range instance.Status.ReplicantNodes {
 			pod := r.state.podWithName(node.PodName)
 			if pod == nil {
 				continue
 			}
-			if updateReady && util.IsPodManagedBy(pod, updateReplicantSet) {
-				targets = append(targets, node.Name)
-			}
-			if r.state.partOfReplicantSet(pod) {
+			if util.IsPodManagedBy(pod, updateReplicantSet) {
 				targets = append(targets, node.Name)
 			}
+			fallback = append(fallback, node.Name)
+		}
+		if len(targets) == 0 {
+			return fallback
 		}
 	} else {
 		for _, node := range instance.Status.CoreNodes {

test/e2e/emqx.go → test/e2e/assert.go

@@ -1,3 +1,19 @@
+/*
+Copyright 2026.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
 package e2e
 
 import (
@@ -8,7 +24,7 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
-func checkEMQXReady(g Gomega, afterTime ...metav1.Time) {
+func EMQXReady(g Gomega, afterTime ...metav1.Time) {
 	var cond metav1.Condition
 	g.Expect(KubectlOut("get", "emqx", "emqx", "-o", "jsonpath={.status.conditions[?(@.type==\"Ready\")]}")).
 		To(UnmarshalInto(&cond), "Failed to get emqx status")
@@ -24,7 +40,7 @@ func checkEMQXReady(g Gomega, afterTime ...metav1.Time) {
 	}
 }
 
-func checkEMQXStatus(g Gomega, coreReplicas int) {
+func CoresStable(g Gomega, coreReplicas int) {
 	var status crd.CoreNodesStatus
 	var nodes []crd.EMQXNode
 	var podList corev1.PodList
@@ -75,7 +91,7 @@ func checkEMQXStatus(g Gomega, coreReplicas int) {
 	)
 }
 
-func checkNoReplicants(g Gomega) {
+func NoReplicants(g Gomega) {
 	g.Expect(KubectlOut("get", "emqx", "emqx",
 		"-o", "jsonpath={.status.replicantNodesStatus.currentReplicas}",
 	)).To(Equal("0"), "EMQX cluster status has replicant replicas")
@@ -84,7 +100,7 @@ func checkNoReplicants(g Gomega) {
 	)).To(BeEmpty(), "EMQX cluster status lists replicant nodes")
 }
 
-func checkReplicantStatus(g Gomega, replicantReplicas int) {
+func ReplicantsStable(g Gomega, replicantReplicas int) {
 	var status crd.ReplicantNodesStatus
 	g.Expect(KubectlOut("get", "emqx", "emqx", "-o", "jsonpath={.status.replicantNodesStatus}")).
 		To(UnmarshalInto(&status), "Failed to get EMQX replicant nodes status")
@@ -96,10 +112,6 @@ func checkReplicantStatus(g Gomega, replicantReplicas int) {
 		),
 		"EMQX status does not have expected number of replicant nodes",
 	)
-	checkReplicantNodesStatusRevision(g, status, replicantReplicas)
-}
-
-func checkReplicantNodesStatusRevision(g Gomega, status crd.ReplicantNodesStatus, replicas int) {
 	var podList corev1.PodList
 	g.Expect(status).To(
 		And(
@@ -118,12 +130,12 @@ func checkReplicantNodesStatusRevision(g Gomega, status crd.ReplicantNodesStatus
 		"-o", "json",
 	)).To(UnmarshalInto(&podList), "Failed to list replicant pods")
 	g.Expect(podList.Items).To(
-		HaveLen(replicas),
-		"EMQX cluster does not have %d current revision replicant pods", replicas,
+		HaveLen(replicantReplicas),
+		"EMQX cluster does not have %d current revision replicant pods", replicantReplicas,
 	)
 }
 
-func checkDSReplicationStatus(g Gomega, coreReplicas int) {
+func DSReplicationStable(g Gomega, coreReplicas int) {
 	status := &crd.DSReplicationStatus{}
 	replicationFactor := min(3, coreReplicas)
 	g.Expect(KubectlOut("get", "emqx", "emqx", "-o", "jsonpath={.status.dsReplication}")).
@@ -146,7 +158,7 @@ func checkDSReplicationStatus(g Gomega, coreReplicas int) {
 	)
 }
 
-func checkDSReplicationHealthy(g Gomega) {
+func DSReplicationHealthy(g Gomega) {
 	g.Expect(KubectlOut("exec", "service/emqx-listeners", "--", "emqx", "ctl", "ds", "info")).
 		NotTo(
 			ContainSubstring("(!)"),

test/e2e/const.go

@@ -0,0 +1,22 @@
+/*
+Copyright 2026.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package e2e
+
+const (
+	// namespace where the project is deployed in
+	Namespace = "emqx-operator-system"
+)