rocketmq-operator之Broker

下辈子再也不写代码了2024-11-01 15:35

一 、了解Broker

Broker主要负责消息的存储、投递和查询以及服务高可用保证。

NameServer几乎无状态节点，因此可集群部署，节点之间无任何信息同步。Broker部署相对复杂。

在 Master-Slave 架构中，Broker 分为 Master 与 Slave。一个Master可以对应多个Slave，但是一个Slave只能对应一个Master。Master 与 Slave 的对应关系通过指定相同的BrokerName，不同的BrokerId 来定义，BrokerId为0表示Master，非0表示Slave。Master也可以部署多个。

二 、Broker的具体实现

我是手抄了一下官网的项目，和官网上的可能有一些不同，我说一下重点

2.1 broke_types

go 复制代码 
// BrokeSpec defines the desired state of Broke
type BrokeSpec struct {
	// INSERT ADDITIONAL SPEC FIELDS - desired state of cluster
	// Important: Run "operator-sdk generate k8s" to regenerate code after modifying this file
	// Size of broker clusters
	Size int `json:"size"`
	// NameServers defines the name service list e.g. 192.168.1.1:9876;192.168.1.2:9876
	NameServers string `json:"nameServers,omitempty"`
	// ClusterMode defines the way to be a broker cluster, valid values can be one of the following:
	// - STATIC: default clusters with static broker roles
	// - CONTROLLER: clusters with DLedger Controller since RocketMQ 5.0
	// - CONTAINER: [NOT implemented yet] enabling broker containers since RocketMQ 5.0
	ClusterMode string `json:"clusterMode,omitempty"`
	// ReplicaPerGroup each broker cluster's replica number
	ReplicaPerGroup int `json:"replicaPerGroup"`
	// BaseImage is the broker image to use for the Pods
	BrokerImage string `json:"brokerImage"`
	// ImagePullPolicy defines how the image is pulled
	ImagePullPolicy corev1.PullPolicy `json:"imagePullPolicy"`
	// HostNetwork can be true or false
	HostNetwork bool `json:"hostNetwork,omitempty"`
	// AllowRestart defines whether allow pod restart
	AllowRestart bool `json:"allowRestart"`
	// Resources describes the compute resource requirements
	Resources corev1.ResourceRequirements `json:"resources"`
	// StorageMode can be EmptyDir, HostPath, StorageClass
	StorageMode string `json:"storageMode"`
	// HostPath is the local path to store data
	HostPath string `json:"hostPath,omitempty"`
	// Env defines custom env, e.g. BROKER_MEM
	Env []corev1.EnvVar `json:"env"`
	// Volumes define the broker.conf
	Volumes []corev1.Volume `json:"volumes"`
	// VolumeClaimTemplates defines the StorageClass
	VolumeClaimTemplates []corev1.PersistentVolumeClaim `json:"volumeClaimTemplates"`
	// The name of pod where the metadata from
	ScalePodName string `json:"scalePodName"`
	// Pod Security Context
	PodSecurityContext *corev1.PodSecurityContext `json:"securityContext,omitempty"`
	// Container Security Context
	ContainerSecurityContext *corev1.SecurityContext `json:"containerSecurityContext,omitempty"`
	// The secrets used to pull image from private registry
	ImagePullSecrets []corev1.LocalObjectReference `json:"imagePullSecrets,omitempty"`
	// Affinity the pod's scheduling constraints
	Affinity *corev1.Affinity `json:"affinity,omitempty"`
	// Tolerations the pod's tolerations.
	Tolerations []corev1.Toleration `json:"tolerations,omitempty"`
	// NodeSelector is a selector which must be true for the pod to fit on a node
	NodeSelector map[string]string `json:"nodeSelector,omitempty"`
	// PriorityClassName indicates the pod's priority
	PriorityClassName string `json:"priorityClassName,omitempty"`
	// ServiceAccountName
	ServiceAccountName string `json:"serviceAccountName,omitempty"`
}

// BrokeStatus defines the observed state of Broke
type BrokeStatus struct {
	// INSERT ADDITIONAL STATUS FIELD - define observed state of cluster
	// Important: Run "make" to regenerate code after modifying this file

	Nodes []string `json:"nodes,omitempty"`
	Size  int      `json:"size"`
}

// +kubebuilder:object:root=true
// +kubebuilder:subresource:status

// Broke is the Schema for the brokes API
type Broke struct {
	metav1.TypeMeta   `json:",inline"`
	metav1.ObjectMeta `json:"metadata,omitempty"`

	Spec   BrokeSpec   `json:"spec,omitempty"`
	Status BrokeStatus `json:"status,omitempty"`
}

// +kubebuilder:object:root=true

// BrokeList contains a list of Broke
type BrokeList struct {
	metav1.TypeMeta `json:",inline"`
	metav1.ListMeta `json:"metadata,omitempty"`
	Items           []Broke `json:"items"`
}

func init() {
	SchemeBuilder.Register(&Broke{}, &BrokeList{})
}

和NameService差不多，不再复述

2.2broke_controller

2.2.1Reconcile方法

核心，无需多言，Reconcile方法有点长我将拆分成多个代码块说明

  1. 获取broker的rc，获取不到就报错
go 复制代码 
// Fetch the Broker instance
//获取broker资源
broker := &appsv1s.Broke{}
err := r.Client.Get(context.TODO(), req.NamespacedName, broker)
if err != nil {
    if errors.IsNotFound(err) {
        // Request object not found, could have been deleted after reconcile request.
        // Owned objects are automatically garbage collected. For additional cleanup logic use finalizers.
        // Return and don't requeue
        reqLogger.Info("Broker resource not found. Ignoring since object must be deleted")
        return reconcile.Result{}, err
    }
    // Error reading the object - requeue the request.
    reqLogger.Error(err, "Failed to get Broker")
    return reconcile.Result{}, err

}
  1. 设置broker集群的数量，这个数量可以理解为几个Master-Slave
ini 复制代码 
//设置broker集群的数量
if broker.Status.Size == 0 {
    //期望值
    share.GroupNum = broker.Spec.Size
} else {
    //实际值
    share.GroupNum = broker.Status.Size
}
  1. 设置broker的NameServers地址
c 复制代码 
//等NameServer初始化完成，才会启动Broker
if broker.Spec.NameServers == "" {
    // wait for name server ready when create broker cluster if nameServers is omitted
    for {
        if share.IsNameServersStrInitialized {
            break
        } else {
            log.Info("Broker Waiting for name server ready...")
            time.Sleep(time.Duration(constants.WaitForNameServerReadyInSecond) * time.Second)
        }
    }
} else {
    //获取NameServer地址
    share.NameServersStr = broker.Spec.NameServers
}

这里算是一个小的重点，如果你部署过MQ的话，在我们启动完nameservice之后，部署broker的时候需要执行如下命令$ nohup sh bin/mqbroker -n localhost:9876 --enable-proxy &来部署Broker，我们发现部署Broker需要输入nameservice的ip地址和端口号，启动的每一台都需要输入，非常麻烦，又没有更好的解决方案呢？

聪明的你可能想到，我写一个脚本，将nameservice地址作为参数传入，去启动多个broker，事实上，我们在mq中确实是这样启动的nohup sh bin/mqbroker -n 192.168.1.1:9876 -c $ROCKETMQ_HOME/conf/2m-noslave/broker-a.properties --enable-proxy &。

但是我们已经用了operator了啊，我们所有的nameservice和broker都交给了rocketmq-operator管理了，那么可不可以将nameservice地址都存到operator中，这样我启动broker时去operator取出地址就行了，这样好处就是完全实现了自动化，无需手动输入nameservice地址，再结合上一篇提到的nameservice地址变化会调用命令通知broker变化，完美的解决broekr获取nameservice地址的问题。

  1. 创建broker的所有（多集群多副本）StatefulSet资源
go 复制代码 
//保存一下broker的集群名字，用于nameService像broker发送命令使用
share.BrokerClusterName = broker.Name

replicaPerGroup := broker.Spec.ReplicaPerGroup
reqLogger.Info("brokerGroupNum=" + strconv.Itoa(share.GroupNum) + ", replicaPerGroup=" + strconv.Itoa(replicaPerGroup))

//两层for循环 第一层时集群（主），第二层 时副本（从）
//循环创建broker集群
for brokerGroupIndex := 0; brokerGroupIndex < share.GroupNum; brokerGroupIndex++ {
    reqLogger.Info("Check Broker cluster" + strconv.Itoa(brokerGroupIndex+1) + "/" + strconv.Itoa(share.GroupNum))
    //这里就和nameservice一样了
    dep := r.getBrokerStatefulSet(broker, brokerGroupIndex, 0)

    // Check if the statefulSet already exists, if not create a new one
    // 检查 statefulSet 是否已经存在，如果不存在，请创建一个新的
    found := &appsv1.StatefulSet{}
    err = r.Client.Get(context.TODO(), types.NamespacedName{Name: dep.Name, Namespace: dep.Namespace}, found)
    if err != nil && errors.IsNotFound(err) {
        reqLogger.Info("Creating a new Master Broker StatefulSet.", "StatefulSet.Namespace", dep.Namespace, "StatefulSet.Name", dep.Name)
        err = r.Client.Create(context.TODO(), dep)
        if err != nil {
            reqLogger.Error(err, "Failed to create new Broker StatefulSet.", "StatefulSet.Namespace", dep.Namespace, "StatefulSet.Name", dep.Name)
        }
    } else if err != nil {
        reqLogger.Error(err, "Failed to get broker master StatefulSet.")
    }

    for replicaIndex := 1; replicaIndex <= replicaPerGroup; replicaIndex++ {
        //从节点
        reqLogger.Info("Check Replica Broker of cluster-" + strconv.Itoa(brokerGroupIndex) + " " + strconv.Itoa(replicaIndex) + "/" + strconv.Itoa(replicaPerGroup))
        replicaDep := r.getBrokerStatefulSet(broker, brokerGroupIndex, replicaIndex)
        err = r.Client.Get(context.TODO(), types.NamespacedName{Name: replicaDep.Name, Namespace: replicaDep.Namespace}, found)
        if err != nil && errors.IsNotFound(err) {
            reqLogger.Info("Creating a new Replica Broker StatefulSet.", "StatefulSet.Namespace", replicaDep.Namespace, "StatefulSet.Name", replicaDep.Name)
            err = r.Client.Create(context.TODO(), replicaDep)
            if err != nil {
                reqLogger.Error(err, "Failed to create new StatefulSet of broker-"+strconv.Itoa(brokerGroupIndex)+"-replica-"+strconv.Itoa(replicaIndex), "StatefulSet.Namespace", replicaDep.Namespace, "StatefulSet.Name", replicaDep.Name)
            }
        } else if err != nil {
            reqLogger.Error(err, "Failed to get broker replica StatefulSet.")
        }
    }
}

重点看一下两个for循环，第一个for创建主节点，第二个for创建从节点，核心在getBrokerStatefulSet方法，主从唯一的区别就是传入replicaIndex的值，主传0,从就是1～n（有几个从就是几），体现出来的就是statefulset名字不同，如一主一从且brokerName为broke-sample，那么对应Broker的statefulset的Name为Brokerbroke-sample-0-masterbroke-sample-0-replica-1。

  1. 如果NameServers地址是否有变化，需要broker更新nameservice地址并重启pod。
less 复制代码 
// Check for name server scaling
//broker是否开启允许重新设置nameService地址
if broker.Spec.AllowRestart {
    // The following code will restart all brokers to update NAMESRV_ADDR env
    // NameServers地址是否有变化？
    if share.IsNameServersStrUpdated {
        for brokerGroupIndex := 0; brokerGroupIndex < broker.Spec.Size; brokerGroupIndex++ {
            brokerName := getBrokerName(broker, brokerGroupIndex)
            // Update master broker
            reqLogger.Info("Update Master Broker NAMESRV_ADDR of " + brokerName)
            dep := r.getBrokerStatefulSet(broker, brokerGroupIndex, 0)
            found := &appsv1.StatefulSet{}
            err = r.Client.Get(context.TODO(), types.NamespacedName{
                Name:      dep.Name,
                Namespace: dep.Namespace,
            }, found)
            if err != nil {
                reqLogger.Error(err, "Failed to get broker master StatefulSet of "+brokerName)
            } else {
                //给每个broker的env里第一个变量赋值nameservice地址
                found.Spec.Template.Spec.Containers[0].Env[0].Value = share.NameServersStr
                err = r.Client.Update(context.TODO(), found)
                if err != nil {
                    reqLogger.Error(err, "Failed to update NAMESRV_ADDR of master broker "+brokerName, "StatefulSet.Namespace", found.Namespace, "StatefulSet.Name", found.Name)
                } else {
                    reqLogger.Info("Successfully updated NAMESRV_ADDR of master broker "+brokerName, "StatefulSet.Namespace", found.Namespace, "StatefulSet.Name", found.Name)
                }
                time.Sleep(time.Duration(constants.RestartBrokerPodIntervalInSecond) * time.Second)
            }

            // Update replicas brokers
            // 从节点同理
            for replicaIndex := 1; replicaIndex <= replicaPerGroup; replicaIndex++ {
                reqLogger.Info("Update Replica Broker NAMESRV_ADDR of " + brokerName + " " + strconv.Itoa(replicaIndex) + "/" + strconv.Itoa(replicaPerGroup))
                replicaDep := r.getBrokerStatefulSet(broker, brokerGroupIndex, replicaIndex)
                replicaFound := &appsv1.StatefulSet{}
                err = r.Client.Get(context.TODO(), types.NamespacedName{Name: replicaDep.Name, Namespace: replicaDep.Namespace}, replicaFound)
                if err != nil {
                    reqLogger.Error(err, "Failed to get broker replica StatefulSet of "+brokerName)
                } else {
                    //从节点可能有多个环境变量，找到名字为"NAMESRV_ADDR"
                    for index := range replicaFound.Spec.Template.Spec.Containers[0].Env {
                        if constants.EnvNameServiceAddress == replicaFound.Spec.Template.Spec.Containers[0].Env[index].Name {
                            //赋值
                            replicaFound.Spec.Template.Spec.Containers[0].Env[index].Value = share.NameServersStr
                            break
                        }
                    }

                    err = r.Client.Update(context.TODO(), replicaFound)
                    if err != nil {
                        reqLogger.Error(err, "Failed to update NAMESRV_ADDR of "+strconv.Itoa(brokerGroupIndex)+"-replica-"+strconv.Itoa(replicaIndex), "StatefulSet.Namespace", replicaFound.Namespace, "StatefulSet.Name", replicaFound.Name)
                    } else {
                        reqLogger.Info("Successfully updated NAMESRV_ADDR of "+strconv.Itoa(brokerGroupIndex)+"-replica-"+strconv.Itoa(replicaIndex), "StatefulSet.Namespace", replicaFound.Namespace, "StatefulSet.Name", replicaFound.Name)
                    }
                    time.Sleep(time.Duration(constants.RestartBrokerPodIntervalInSecond) * time.Second)
                }
            }
        }
    }
    share.IsNameServersStrUpdated = false
}

其实这里大概率不需要我们更新nameservice地址，因为NameService会通过admin的方式去更改。

  1. 检测所有pod是否都是就绪态，没有就先return。
go 复制代码 
// List the pods for this broker's statefulSet
podList := &corev1.PodList{}
labelSelector := labels.SelectorFromSet(labelsForBroker(broker.Name))
listOps := &client.ListOptions{
    Namespace:     broker.Namespace,
    LabelSelector: labelSelector,
}

err = r.Client.List(context.TODO(), podList, listOps)
if err != nil {
    reqLogger.Error(err, "Failed to list pods.", "Broker.Namespace", broker.Namespace, "Broker.Name", broker.Name)
    return reconcile.Result{}, err
}
// 拿到所有pod的名字作保存
podNames := getPodNames(podList.Items)
log.Info("broker.Status.Nodes length = " + strconv.Itoa(len(broker.Status.Nodes)))
log.Info("podNames length = " + strconv.Itoa(len(podNames)))
// Ensure every pod is in ready
// 确保每个pod都是就绪态
for _, pod := range podList.Items {
    //已经启动
    if !reflect.DeepEqual(pod.Status.Phase, corev1.PodRunning) {
        log.Info("pod " + pod.Name + " phase is " + string(pod.Status.Phase) + ", wait for a moment...")
    }
    //已经通过检查
    if !isReady(pod) {
        reqLogger.Info("pod " + pod.Name + " is not ready, wait for a moment...")
        return reconcile.Result{Requeue: true, RequeueAfter: time.Duration(constants.RequeueIntervalInSecond) * time.Second}, nil
    }
}
  1. 如果发现扩容，会复制sourcePodName名字pod的subscriptionGroup.json和topics.json文件内容，然后生成写入这些内容的命令（ps：理解为拷贝文件复制到新的pod里）
go 复制代码 
if broker.Status.Size != 0 && broker.Spec.Size > broker.Status.Size {
    // Get the metadata including subscriptionGroup.json and topics.json from scale source pod
    k8s, err := tool.NewK8sClient()
    if err != nil {
        log.Error(err, "Error occurred while getting K8s Client")
    }
    // 这个pod是你自己手动指定的
    sourcePodName := broker.Spec.ScalePodName
    topicsCommand := getCopyMetadataJsonCommand(cons.TopicJsonDir, sourcePodName, broker.Namespace, k8s)
    log.Info("topicsCommand: " + topicsCommand)
    subscriptionGroupCommand := getCopyMetadataJsonCommand(cons.SubscriptionGroupJsonDir, sourcePodName, broker.Namespace, k8s)
    log.Info("subscriptionGroupCommand: " + subscriptionGroupCommand)
    MakeConfigDirCommand := "mkdir -p " + cons.StoreConfigDir
    ChmodDirCommand := "chmod a+rw " + cons.StoreConfigDir
    cmdContent := MakeConfigDirCommand + " && " + ChmodDirCommand
    if topicsCommand != "" {
        cmdContent = cmdContent + " && " + topicsCommand
    }
    if subscriptionGroupCommand != "" {
        cmdContent = cmdContent + " && " + subscriptionGroupCommand
    }
    cmd = []string{"/bin/bash", "-c", cmdContent}
}

其实这里这里只是生成了命令，当再次执行4中的getBrokerStatefulSet方法时，会有一个钩子函数，在pod创建成功之后立即执行这个命令。

  1. 更新state的size和node
scss 复制代码 
// Update status.Size if needed
if broker.Spec.Size != broker.Status.Size {
    log.Info("broker.Status.Size = " + strconv.Itoa(broker.Status.Size))
    log.Info("broker.Spec.Size = " + strconv.Itoa(broker.Spec.Size))
    broker.Status.Size = broker.Spec.Size
    err = r.client.Status().Update(context.TODO(), broker)
    if err != nil {
        reqLogger.Error(err, "Failed to update Broker Size status.")
    }
}

// Update status.Nodes if needed
if !reflect.DeepEqual(podNames, broker.Status.Nodes) {
    broker.Status.Nodes = podNames
    err = r.client.Status().Update(context.TODO(), broker)
    if err != nil {
        reqLogger.Error(err, "Failed to update Broker Nodes status.")
    }
}

这里更新完之后，当下一次执行4的时候如果是扩容，那么它在执行getBrokerStatefulSet时就是7中新的cmd命令了。至此流程结束。

画一个流程图方便理解：

2.2.2getBrokerStatefulSet方法

主要有两部分我分别介绍以下

  1. 设置statefulset的名字，主从不一样
ini 复制代码 
//主要看一下静态代理
if broker.Spec.ClusterMode == "STATIC" {
    if replicaIndex == 0 { //主节点默认是0
        //拼接statefuleSetName名字
        statefuleSetName = broker.Name + "-" + strconv.Itoa(brokerGroupIndex) + "-master"
    } else {
        statefuleSetName = broker.Name + "-" + strconv.Itoa(brokerGroupIndex) + "-replica-" + strconv.Itoa(replicaIndex)
    }
} else if broker.Spec.ClusterMode == "CONTROLLER" {
    statefuleSetName = broker.Name + "-" + strconv.Itoa(brokerGroupIndex) + "-" + strconv.Itoa(replicaIndex)
}
  1. 创建statefulset
yaml 复制代码 
dep := &appsv1.StatefulSet{
    ObjectMeta: metav1.ObjectMeta{
        Name:      statefuleSetName,
        Namespace: broker.Namespace,
    },
    Spec: appsv1.StatefulSetSpec{
        Replicas: c, //这里默认是1，和Nameservice有很大的不同，Nameservice获取的是spec.size
        Selector: &metav1.LabelSelector{
            MatchLabels: ls,
        },
        UpdateStrategy: appsv1.StatefulSetUpdateStrategy{
            Type: appsv1.RollingUpdateStatefulSetStrategyType,
        },
        Template: corev1.PodTemplateSpec{
            ObjectMeta: metav1.ObjectMeta{
                Labels: ls,
            },
            Spec: corev1.PodSpec{
                ServiceAccountName: broker.Spec.ServiceAccountName,
                HostNetwork:        broker.Spec.HostNetwork,
                DNSPolicy:          corev1.DNSClusterFirstWithHostNet,
                Affinity:           broker.Spec.Affinity,
                Tolerations:        broker.Spec.Tolerations,
                NodeSelector:       broker.Spec.NodeSelector,
                PriorityClassName:  broker.Spec.PriorityClassName,
                Containers: []corev1.Container{{
                    Resources: broker.Spec.Resources,
                    Image:     broker.Spec.BrokerImage,
                    Name:      constants.BrokerContainerName,
                    Lifecycle: &corev1.Lifecycle{
                        PostStart: &corev1.LifecycleHandler{ //钩子函数启动之后立即执行
                            Exec: &corev1.ExecAction{
                                Command: cmd,
                            },
                        },
                    },
                    SecurityContext: broker.GetContainerSecurityContext(),
                    ImagePullPolicy: broker.Spec.ImagePullPolicy,
                    Env:             getENV(broker, replicaIndex, brokerGroupIndex), //->
                    Ports: []corev1.ContainerPort{{
                        ContainerPort: constants.BrokerVipContainerPort,
                        Name:          constants.BrokerVipContainerPortName,
                    }, {
                        ContainerPort: constants.BrokerMainContainerPort,
                        Name:          constants.BrokerMainContainerPortName,
                    },
                                              {
                                                  ContainerPort: constants.BrokerHighAvailabilityContainerPort,
                                                  Name:          constants.BrokerHighAvailabilityContainerPortName,
                                              }},
                    VolumeMounts: []corev1.VolumeMount{{
                        MountPath: constants.LogMountPath,
                        Name:      broker.Spec.VolumeClaimTemplates[0].Name,
                        SubPath:   constants.LogSubPathName + getPathSuffix(broker, brokerGroupIndex, replicaIndex),
                    }, {
                        MountPath: constants.StoreMountPath,
                        Name:      broker.Spec.VolumeClaimTemplates[0].Name,
                        SubPath:   constants.StoreSubPathName + getPathSuffix(broker, brokerGroupIndex, replicaIndex),
                    }, {
                        MountPath: constants.BrokerConfigPath + "/" + constants.BrokerConfigName,
                        Name:      broker.Spec.VolumeClaimTemplates[0].Name,
                        SubPath:   constants.BrokerConfigName,
                    }},
                }},
                Volumes:         broker.GetVolumes(),
                SecurityContext: broker.GetPodSecurityContext(),
            },
        },
        VolumeClaimTemplates: broker.GetVolumeClaimTemplates(),
    },
}

一是Replicas: c, 这里默认是1，和NameService有很大的不同，NameService获取的是spec.size。也就是说NameService不管几个pod，都只会创建一个statefulset，而Broker是每个pod会创建一个statefulset。

二是下面这段代码，他会在pod成功后执行我们的cmd命令，也就是我们刚刚提到的2.2.1中的第7步，创建subscriptionGroup.json和topics.json。

css 复制代码 
                     Lifecycle: &corev1.Lifecycle{
                        PostStart: &corev1.LifecycleHandler{ //钩子函数启动之后立即执行
                            Exec: &corev1.ExecAction{
                                Command: cmd,
                            },
                        },
                    },

总结

我感觉主要是做了这两件事：

  1. 实现了新扩容的Name Server 自动被所有Broker感知
  2. 新扩容的Broker元数据注册

参考

GitHub - apache/rocketmq-operator: Apache RocketMQ Operator

初识RocketMQ | RocketMQ

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