Fix Kafka Channel dispatcher ownerRef

kafka/channel/config/500-dispatcher.yaml

@@ -0,0 +1,83 @@
+# Copyright 2020 The Knative Authors
+#
+# 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.
+
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: kafka-ch-dispatcher
+  namespace: knative-eventing
+  labels:
+    eventing.knative.dev/release: devel
+spec:
+  # this deployment is going to be scaled up by the
+  # controller when the very first KafkaChannel is created
+  replicas: 0
+  selector:
+    matchLabels:
+      messaging.knative.dev/channel: kafka-channel
+      messaging.knative.dev/role: dispatcher
+  template:
+    metadata:
+      labels:
+        messaging.knative.dev/channel: kafka-channel
+        messaging.knative.dev/role: dispatcher
+        eventing.knative.dev/release: devel
+    spec:
+      containers:
+        - name: dispatcher
+          image: ko://knative.dev/eventing-contrib/kafka/channel/cmd/channel_dispatcher
+          env:
+            - name: SYSTEM_NAMESPACE
+              valueFrom:
+                fieldRef:
+                  apiVersion: v1
+                  fieldPath: metadata.namespace
+            - name: METRICS_DOMAIN
+              value: "knative.dev/eventing"
+            - name: CONFIG_LOGGING_NAME
+              value: "config-logging"
+            - name: CONFIG_LEADERELECTION_NAME
+              value: "config-leader-election-kafka"
+          ports:
+            - containerPort: 9090
+              name: metrics
+              protocol: TCP
+          volumeMounts:
+            - name: config-kafka
+              mountPath: /etc/config-kafka
+      serviceAccountName: kafka-ch-dispatcher
+      volumes:
+        - name: config-kafka
+          configMap:
+            name: config-kafka
+
+---
+
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    messaging.knative.dev/channel: kafka-channel
+    messaging.knative.dev/role: dispatcher
+  name: kafka-ch-dispatcher
+  namespace: knative-eventing
+spec:
+  ports:
+  - name: http-dispatcher
+    port: 80
+    protocol: TCP
+    targetPort: 8080
+  selector:
+    messaging.knative.dev/channel: kafka-channel
+    messaging.knative.dev/role: dispatcher

kafka/channel/pkg/dispatcher/dispatcher.go

@@ -90,7 +90,7 @@ func NewDispatcher(ctx context.Context, args *KafkaDispatcherArgs) (*KafkaDispat
 
 	producer, err := sarama.NewAsyncProducer(args.Brokers, conf)
 	if err != nil {
-		return nil, fmt.Errorf("unable to create kafka producer: %v", err)
+		return nil, fmt.Errorf("unable to create kafka producer against Kafka bootstrap servers %v : %v", args.Brokers, err)
 	}
 
 	dispatcher := &KafkaDispatcher{

kafka/channel/pkg/reconciler/controller/kafkachannel.go

@@ -20,7 +20,8 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"reflect"
+
+	"k8s.io/utils/pointer"
 
 	"github.com/Shopify/sarama"
 
@@ -294,17 +295,51 @@ func (r *Reconciler) reconcileDispatcher(ctx context.Context, scope string, disp
 		logging.FromContext(ctx).Errorw("Unable to get the dispatcher deployment", zap.Error(err))
 		kc.Status.MarkDispatcherUnknown("DispatcherDeploymentFailed", "Failed to get dispatcher deployment: %v", err)
 		return nil, err
-	} else if !reflect.DeepEqual(expected.Spec.Template.Spec.Containers[0].Image, d.Spec.Template.Spec.Containers[0].Image) {
-		logging.FromContext(ctx).Infof("Deployment image is not what we expect it to be, updating Deployment Got: %q Expect: %q", expected.Spec.Template.Spec.Containers[0].Image, d.Spec.Template.Spec.Containers[0].Image)
-		d, err := r.KubeClientSet.AppsV1().Deployments(dispatcherNamespace).Update(expected)
-		if err == nil {
-			controller.GetEventRecorder(ctx).Event(kc, corev1.EventTypeNormal, dispatcherDeploymentUpdated, "Dispatcher deployment updated")
-			kc.Status.PropagateDispatcherStatus(&d.Status)
-			return d, nil
-		} else {
-			kc.Status.MarkServiceFailed("DispatcherDeploymentUpdateFailed", "Failed to update the dispatcher deployment: %v", err)
+	} else {
+		existing := utils.FindContainer(d, resources.DispatcherContainerName)
+		if existing == nil {
+			logging.FromContext(ctx).Errorw("Container %s does not exist in existing dispatcher deployment. Updating the deployment", resources.DispatcherContainerName)
+			d, err := r.KubeClientSet.AppsV1().Deployments(dispatcherNamespace).Update(expected)
+			if err == nil {
+				controller.GetEventRecorder(ctx).Event(kc, corev1.EventTypeNormal, dispatcherDeploymentUpdated, "Dispatcher deployment updated")
+				kc.Status.PropagateDispatcherStatus(&d.Status)
+				return d, nil
+			} else {
+				kc.Status.MarkServiceFailed("DispatcherDeploymentUpdateFailed", "Failed to update the dispatcher deployment: %v", err)
+			}
+			return d, newDeploymentWarn(err)
+		}
+
+		expectedContainer := utils.FindContainer(expected, resources.DispatcherContainerName)
+		if expectedContainer == nil {
+			return nil, errors.New(fmt.Sprintf("Container %s does not exist in expected dispatcher deployment. Cannot check if the deployment needs an update.", resources.DispatcherContainerName))
+		}
+
+		needsUpdate := false
+
+		if existing.Image != expectedContainer.Image {
+			logging.FromContext(ctx).Infof("Dispatcher deployment image is not what we expect it to be, updating Deployment Got: %q Expect: %q", expected.Spec.Template.Spec.Containers[0].Image, d.Spec.Template.Spec.Containers[0].Image)
+			existing.Image = expectedContainer.Image
+			needsUpdate = true
+		}
+
+		if *d.Spec.Replicas == 0 {
+			logging.FromContext(ctx).Infof("Dispatcher deployment has 0 replicas. Scaling up deployment to 1 replicas")
+			d.Spec.Replicas = pointer.Int32Ptr(1)
+			needsUpdate = true
+		}
+
+		if needsUpdate {
+			d, err := r.KubeClientSet.AppsV1().Deployments(dispatcherNamespace).Update(d)
+			if err == nil {
+				controller.GetEventRecorder(ctx).Event(kc, corev1.EventTypeNormal, dispatcherDeploymentUpdated, "Dispatcher deployment updated")
+				kc.Status.PropagateDispatcherStatus(&d.Status)
+				return d, nil
+			} else {
+				kc.Status.MarkServiceFailed("DispatcherDeploymentUpdateFailed", "Failed to update the dispatcher deployment: %v", err)
+			}
+			return d, newDeploymentWarn(err)
 		}
-		return d, newDeploymentWarn(err)
 	}
 
 	kc.Status.PropagateDispatcherStatus(&d.Status)

kafka/channel/pkg/reconciler/controller/resources/dispatcher.go

@@ -24,6 +24,8 @@ import (
 	"knative.dev/pkg/system"
 )
 
+const DispatcherContainerName = "dispatcher"
+
 var (
 	serviceAccountName = "kafka-ch-dispatcher"
 	dispatcherName     = "kafka-ch-dispatcher"
@@ -65,7 +67,7 @@ func MakeDispatcher(args DispatcherArgs) *v1.Deployment {
 					ServiceAccountName: serviceAccountName,
 					Containers: []corev1.Container{
 						{
-							Name:  "dispatcher",
+							Name:  DispatcherContainerName,
 							Image: args.Image,
 							Env:   makeEnv(args),
 							Ports: []corev1.ContainerPort{{

kafka/channel/pkg/utils/util.go

@@ -19,6 +19,8 @@ package utils
 import (
 	"errors"
 	"fmt"
+	appsv1 "k8s.io/api/apps/v1"
+	corev1 "k8s.io/api/core/v1"
 	"strings"
 
 	"knative.dev/pkg/configmap"
@@ -89,3 +91,13 @@ func TopicName(separator, namespace, name string) string {
 	topic := []string{knativeKafkaTopicPrefix, namespace, name}
 	return strings.Join(topic, separator)
 }
+
+func FindContainer(d *appsv1.Deployment, containerName string) *corev1.Container {
+	for i := range d.Spec.Template.Spec.Containers {
+		if d.Spec.Template.Spec.Containers[i].Name == containerName {
+			return &d.Spec.Template.Spec.Containers[i]
+		}
+	}
+
+	return nil
+}