Spark Operator Chart

GoogleCloud Spark Operator，基于Spark官方Kubernetes资源管理器的实现，实现了通过K8S接口提交Spark应用的功能。
下面列出了一些官方Operator Chart中核心yaml文件的定义，可能与最新版本的文件有些不同，请读者自行更新，同时欢迎交流。

sparkapps-crd.yaml

通过Opertaor方式提交Spark应用时的自定义资源描述文件，描述了所有类型为SparkApplication的资源对象的关键Field的定义，各字段的验证规范须符合给定的JSON Template规则，如cores字段的值必须大于等于0等。

apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  creationTimestamp: null
  generation: 1
  name: sparkapplications.sparkoperator.k8s.io
spec:
  group: sparkoperator.k8s.io
  names:
    kind: SparkApplication
    listKind: SparkApplicationList
    plural: sparkapplications
    shortNames:
    - sparkapp
    singular: sparkapplication
  scope: Namespaced
  validation:
    openAPIV3Schema:
      properties:
        metadata:
          properties:
            name:
              maxLength: 63
              minLength: 1
              type: string
        spec:
          properties:
            deps:
              properties:
                downloadTimeout:
                  minimum: 1
                  type: integer
                maxSimultaneousDownloads:
                  minimum: 1
                  type: integer
            driver:
              properties:
                cores:
                  exclusiveMinimum: true
                  minimum: 0
                  type: number
                podName:
                  pattern: '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*'
            executor:
              properties:
                cores:
                  exclusiveMinimum: true
                  minimum: 0
                  type: number
                instances:
                  minimum: 1
                  type: integer
            mode:
              enum:
              - cluster
              - client
            monitoring:
              properties:
                prometheus:
                  properties:
                    port:
                      maximum: 49151
                      minimum: 1024
                      type: integer
            pythonVersion:
              enum:
              - "2"
              - "3"
            restartPolicy:
              properties:
                onFailureRetries:
                  minimum: 0
                  type: integer
                onFailureRetryInterval:
                  minimum: 1
                  type: integer
                onSubmissionFailureRetries:
                  minimum: 0
                  type: integer
                onSubmissionFailureRetryInterval:
                  minimum: 1
                  type: integer
                type:
                  enum:
                  - Never
                  - OnFailure
                  - Always
            type:
              enum:
              - Java
              - Scala
              - Python
              - R
  version: v1beta2
status:
  acceptedNames:
    kind: ""
    plural: ""
  conditions: []

spark-operator-rbac.yaml

定义了Operator服务的RBAC规则，指定了能够有权限使用的API接口，如对Pod资源的增、删、改、查等。

{{- if .Values.rbac.create }}
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: {{ include "sparkoperator.fullname" . }}-cr
  labels:
    app.kubernetes.io/name: {{ include "sparkoperator.name" . }}
    helm.sh/chart: {{ include "sparkoperator.chart" . }}
    app.kubernetes.io/instance: {{ .Release.Name }}
    app.kubernetes.io/managed-by: {{ .Release.Service }}
rules:
- apiGroups: [""]
  resources: ["pods"]
  verbs: ["*"]
- apiGroups: [""]
  resources: ["services", "configmaps", "secrets"]
  verbs: ["create", "get", "delete", "update"]
- apiGroups: ["extensions"]
  resources: ["ingresses"]
  verbs: ["create", "get", "delete"]
- apiGroups: [""]
  resources: ["nodes"]
  verbs: ["get"]
- apiGroups: [""]
  resources: ["events"]
  verbs: ["create", "update", "patch"]
- apiGroups: ["apiextensions.k8s.io"]
  resources: ["customresourcedefinitions"]
  verbs: ["create", "get", "update", "delete"]
- apiGroups: ["admissionregistration.k8s.io"]
  resources: ["mutatingwebhookconfigurations"]
  verbs: ["create", "get", "update", "delete"]
- apiGroups: ["sparkoperator.k8s.io"]
  resources: ["sparkapplications", "scheduledsparkapplications"]
  verbs: ["*"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: {{ include "sparkoperator.fullname" . }}-crb
  labels:
    app.kubernetes.io/name: {{ include "sparkoperator.name" . }}
    helm.sh/chart: {{ include "sparkoperator.chart" . }}
    app.kubernetes.io/instance: {{ .Release.Name }}
    app.kubernetes.io/managed-by: {{ .Release.Service }}
subjects:
  - kind: ServiceAccount
    name: {{ include "sparkoperator.serviceAccountName" . }}
    namespace: {{ .Release.Namespace }}
roleRef:
  kind: ClusterRole
  name: {{ include "sparkoperator.fullname" . }}-cr
  apiGroup: rbac.authorization.k8s.io
{{- end }}

spark-rbac.yaml

定义了Spark应用，Kind为SparkApplication，能够有权限访问的API接口，这里只需要拥有POD资源的所有权限即可，因为一个Spark应用可以认为就是启动了Driver&Executor两种容器，而Driver需要调用Pod接口来管理所有的Executor。

{{- if and (.Values.rbac.create) (ne .Values.sparkJobNamespace "") }}
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  namespace: {{ .Values.sparkJobNamespace }}
  name: spark-role
  labels:
    app.kubernetes.io/name: {{ include "sparkoperator.name" . }}
    helm.sh/chart: {{ include "sparkoperator.chart" . }}
    app.kubernetes.io/instance: {{ .Release.Name }}
    app.kubernetes.io/managed-by: {{ .Release.Service }}
rules:
- apiGroups:
  - "" # "" indicates the core API group
  resources:
  - "pods"
  verbs:
  - "*"
- apiGroups:
  - "" # "" indicates the core API group
  resources:
  - "services"
  verbs:
  - "*"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: spark-role-binding
  namespace: {{ .Values.sparkJobNamespace }}
  labels:
    app.kubernetes.io/name: {{ include "sparkoperator.name" . }}
    helm.sh/chart: {{ include "sparkoperator.chart" . }}
    app.kubernetes.io/instance: {{ .Release.Name }}
    app.kubernetes.io/managed-by: {{ .Release.Service }}
subjects:
- kind: ServiceAccount
  name: {{ include "spark.serviceAccountName" . }}
  namespace: {{ .Values.sparkJobNamespace }}
  roleRef:
  kind: Role
  name: spark-role
  apiGroup: rbac.authorization.k8s.io
{{- end }}

webhook-init-job.yaml

截至v2.4.4-v1beta2版本，Operator官方只支持Service的方式注册Webhook服务到Kubernetes集群，因此本人修改了一相关的脚本和代码，以支持通过外部域名或是Ingress来注册服务，并可以通过参数的选择。

{{ if .Values.enableWebhook }}
apiVersion: batch/v1
kind: Job
metadata:
  name: {{ include "sparkoperator.fullname" . }}-init
  namespace: {{ .Release.Namespace }}
  annotations:
    "helm.sh/hook": post-install, post-upgrade
    "helm.sh/hook-delete-policy": hook-succeeded
  labels:
    app.kubernetes.io/name: {{ include "sparkoperator.name" . }}
    helm.sh/chart: {{ include "sparkoperator.chart" . }}
    app.kubernetes.io/instance: {{ .Release.Name }}
    app.kubernetes.io/managed-by: {{ .Release.Service }}
spec:
  template:
    spec:
      serviceAccountName: {{ include "sparkoperator.serviceAccountName" . }}
      restartPolicy: OnFailure
      containers:
      - name: main
        image: {{ .Values.operatorImageName }}:{{ .Values.operatorVersion }}
        imagePullPolicy: {{ .Values.imagePullPolicy }}
        {{- if .Values.environments }}
        env:
        - name: WEBHOOK_INGRESS_NAME
          value: {{ include "sparkoperator.webhookIngressName" . }}
        {{- range $key, $val := .Values.environments }}
        - name: {{ $key }}
          value: {{ $val | quote }}
        {{- end }}
        {{- end }}
        ## create secret bind to a Service, the original definition
        #command: ["/bin/bash", "-l", "-c", "/usr/bin/gencerts.sh -n {{ .Release.Namespace }} -s {{ .Release.Name }}-webhook -p"]
        ## create secret bind to an Ingress
        ## gencerts.sh usage:
        ##   -h | --help                    Display help information.
        ##   -n | --namespace <namespace>   The namespace where the Spark operator is installed.
        ##   -s | --service <service>       The name of the webhook service.
        ##   -i | --ingress <ingress>       The name of the webhook ingress name if using url mode
        ##   -p | --in-pod                  Whether the script is running inside a pod or not.
        command: ["/bin/bash", "-l", "-c", "sudo sed -i 's/kubernetes.default.svc/xx-k8s-master-domain.com/g' /usr/bin/gencerts.sh; /usr/bin/gencerts.sh -n {{ .Release.Namespace }} -i ${WEBHOOK_INGRESS_NAME} -p"]
{{ end }}

spark-operator-deployment.yaml

Spark Operator服务的定义文件，指定如果启动一个Controller、Webhook进程，所有的相关组件都围绕这个Deployment开展工作，截至v2.4.4-v1beta2版本，已经可以支持Scala、Python、R程序。

# If the admission webhook is enabled, then a post-install step is required
# to generate and install the secret in the operator namespace.

# In the post-install hook, the token corresponding to the operator service account
# is used to authenticate with the Kubernetes API server to install the secret bundle.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: {{ include "sparkoperator.fullname" . }}
  namespace: {{ .Release.Namespace }}
  labels:
    app.kubernetes.io/name: {{ include "sparkoperator.name" . }}
    helm.sh/chart: {{ include "sparkoperator.chart" . }}
    app.kubernetes.io/instance: {{ .Release.Name }}
    app.kubernetes.io/managed-by: {{ .Release.Service }}
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: {{ include "sparkoperator.name" . }}
      app.kubernetes.io/version: {{ .Values.operatorVersion }}
  strategy:
    type: Recreate
  template:
    metadata:
      {{- if .Values.enableMetrics }}
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "{{ .Values.metricsPort }}"
        prometheus.io/path: {{ .Values.metricsEndpoint }}
      {{- end }}
      labels:
        app.kubernetes.io/name: {{ include "sparkoperator.name" . }}
        app.kubernetes.io/version: {{ .Values.operatorVersion }}
      initializers:
        pending: []
    spec:
      serviceAccountName: {{ include "sparkoperator.serviceAccountName" . }}
      volumes:
        - name: hdfs-conf
          configMap:
            name: demo-hdfs-conf
        - name: spark-conf
          configMap:
            name: demo-spark-operator-2.4.3
        - name: hive-conf
          configMap:
            name: demo-hive-conf
      {{- if .Values.enableWebhook }}
        - name: webhook-certs
          secret:
            secretName: {{ include "sparkoperator.webhookSecretName" . }}
      {{- end }}
      containers:
      - name: sparkoperator
        image: {{ .Values.operatorImageName }}:{{ .Values.operatorVersion }}
        imagePullPolicy: {{ .Values.imagePullPolicy }}
        {{- if .Values.environments }}
        env:
        {{- range $key, $val := .Values.environments }}
        - name: {{ $key }}
          value: {{ $val | quote }}
        {{- end }}
        {{- end }}
        volumeMounts:
          - name: hdfs-conf
            mountPath: /etc/conf/hdfs
          - name: spark-conf
            mountPath: /etc/conf/spark
          - name: hive-conf
            mountPath: /etc/conf/hive
        {{- if .Values.enableWebhook }}
          - name: webhook-certs
            mountPath: /etc/webhook-certs
        {{- end }}
        {{- if .Values.enableMetrics }}
        ports:
          - containerPort: {{ .Values.metricsPort }}
        {{ end }}
        args:
        - -v={{ .Values.logLevel }}
        - -namespace={{ .Values.sparkJobNamespace }}
        - -ingress-url-format={{ .Values.ingressUrlFormat }}
        - -controller-threads={{ .Values.controllerThreads }}
        - -resync-interval={{ .Values.resyncInterval }}
        - -logtostderr
        {{- if .Values.enableMetrics }}
        - -enable-metrics=true
        - -metrics-labels=app_type
        - -metrics-port={{ .Values.metricsPort }}
        - -metrics-endpoint={{ .Values.metricsEndpoint }}
        - -metrics-prefix={{ .Values.metricsPrefix }}
        {{- end }}
        {{- if .Values.enableWebhook }}
        - -enable-webhook=true
        - -webhook-svc-namespace={{ .Release.Namespace }}
        - -webhook-port={{ .Values.webhookPort }}
        - -webhook-svc-name={{ include "sparkoperator.webhookServiceName" . }}
        - -webhook-config-name={{ include "sparkoperator.fullname" . }}-webhook-config
        ## two self-defined args for supporting URL
        - -webhook-mode={{ .Values.webhookMode }}
        - -webhook-url={{ .Values.webhookUrl }}
        {{- end }}
      {{- if .Values.nodeSelector }}
      nodeSelector:
{{ toYaml .Values.nodeSelector | indent 8 }}
      {{- end }}

Spark Application Chart

定义了一个Spark应用需要的资源信息，如Driver容器的可能CPU数、内存大小、是否挂载Volumes等，同理定义Executor容器。

sparkapp-template.yaml

apiVersion: {{ required "You must specify the active api version!" .Values.apiVersion | quote }}
kind: SparkApplication
metadata:
  name: {{ include "sparkapp.fullname" . }}
  namespace: {{ .Values.namespace | default "mlp" }}
  annotations:
    business_domain: {{ .Values.businessDomain }}
spec:
  type: {{ .Values.type | default "Scala" }}
  mode: {{ .Values.mode | default "cluster" }}
  image: {{ .Values.image }}
  {{- if eq .Values.type "Python" }}
  pythonVersion: {{ .Values.pythonVersion | default 3 | quote }}
  mainApplicationFile: {{required "Then entrypoint python file should be given!" .Values.mainApplicationFile | quote }}
  {{- end }}
  {{- if eq .Values.type "Scala" }}
  mainClass: {{ required "While submitting a Scala application, you should specify the main class!" .Values.mainClass | quote }}
  mainApplicationFile: {{ required "While submitting a Scala application, a jar file should be supplied!" .Values.mainApplicationFile | quote }}
  {{- end }}
  {{- if .Values.arguments }}
  arguments:
  {{- range $val := .Values.arguments }}
    - {{ $val | quote }}
  {{- end }}
  {{- end }}
  {{- with .Values.deps }}
  deps:
    {{- if .jars }}
    jars:
    {{- range .jars }}
      - {{ . }}
    {{- end }}
    {{- end }}
    {{- if .files }}
    files:
    {{- range .files }}
      - {{ . }}
    {{- end }}
    {{- end }}
    {{- if .pyFiles }}
    pyFiles:
    {{- range .pyFiles }}
      - {{ . }}
    {{- end }}
    {{- end }}
  {{- end }}
  {{- if .Values.sparkConf }}
  sparkConf:
    {{- range $key, $val := .Values.sparkConf }}
    {{ $key }}: {{ quote $val }}
    {{- end }}
    {{- include "sparkapp.envs" . | indent 4 }}
  {{- end }}
  {{- if .Values.sparkConfigMap }}
  sparkConfigMap: {{ .Values.sparkConfigMap }}
  {{- end }}
  sparkVersion: {{ .Values.sparkVersion }}
  {{- include "sparkapp.volumes" . }}
  {{- include "sparkapp.driver" . }}
  {{- include "sparkapp.executor" . }}
  {{- if .Values.nodeSelector }}
  nodeSelector:
{{ toYaml .Values.nodeSelector | indent 4 }}
  {{- end }}
  {{- if .Values.restartPolicy }}
  restartPolicy:
{{ toYaml .Values.restartPolicy | indent 4 }}
  {{- end }}

_helpers.tpl

以.tpl为后缀的文件，用于定义模板对象，在此文件中定义的变量，可以被其它yaml直接引用，请参考详细的语法规则。
我在这个文件中定义了Volume、Driver、Executor对象，但不一定是最合适的地方，仅供参考。

{{/* Define executor args */}}
{{- define "sparkapp.labels" }}
    annotations:
      business_domain: {{ .Values.businessDomain }}
    labels:
      version: {{ .Values.sparkVersion }}
      falcon: spark-operator
      vip.com/helm-reference: {{ .Release.Name }}
{{- end }}
{{- define "sparkapp.driverlabels" -}}
{{ include "sparkapp.labels" . }}
{{- range $key, $value := .Values.driver.labels }}
      {{ $key }}: {{ $value }}
{{- end }}
{{- end -}}
{{- define "sparkapp.executorlabels" -}}
{{ include "sparkapp.labels" . }}
{{- range $key, $value := .Values.executor.labels }}
      {{ $key }}: {{ $value }}
{{- end }}
{{- end -}}

{{/* Define driver & executor environments */}}
{{- define "sparkapp.envs" -}}
{{- range $kv := .Values.envs }}
{{ printf "%s.%s" "spark.kubernetes.driverEnv" $kv.name | quote }}: {{ $kv.value | quote }}
{{ printf "%s.%s" "spark.executorEnv" $kv.name | quote }}: {{ $kv.value | quote }}
{{- end }}
{{- end -}}

{{- define "sparkapp.fullname" -}}
{{- $name := default "spark-app" .Values.appname -}}
{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
{{- end -}}

{{- define "sparkapp.volumes" }}
  volumes:
    {{- with .Values.configMaps }}
    - name: hdfs-conf
      configMap:
        name: {{ .hdfsconf }}
    - name: hive-conf
      configMap:
        name: {{ .hiveconf }}
    {{- end }}
    - name: spark-log
      hostPath:
        # spark logs location on host
        path: {{ .Values.volumes.hostPath.sparkLog | default "/tmp/operator/log" }}
        # optional
        type: DirectoryOrCreate
    - name: spark-work-dir
      hostPath:
        # spark worker location on host
        path: {{ .Values.volumes.hostPath.sparkWork | default "/tmp/operator/worker" }}
        # optional
        type: DirectoryOrCreate
    - name: spark-hard-disk
      hostPath:
        # spark local data location on host
        path: {{ .Values.volumes.hostPath.sparkLocalData | default "/tmp/operator/data" }}
        # optional
        type: DirectoryOrCreate
{{- end }}

{{/* Spark driver defines. */}}
{{- define "sparkapp.driver" }}
  driver:
    cores: {{ .Values.driver.cores | default 1 }}
    coreLimit: {{ .Values.driver.coreLimit | default 1 | quote }}
    memory: {{ .Values.driver.memory | default "512m" }}
    {{- if .Values.driver.configMaps }}
    configMaps:
      {{- range $kv := .Values.driver.configMaps }}
      - name: {{ $kv.name }}
        path: {{ $kv.path }}
      {{- end }}
    {{- end }}
    {{- if .Values.driver.volumeMounts }}
    volumeMounts:
      {{- range $kv := .Values.driver.volumeMounts }}
      - name: {{ $kv.name }}
        mountPath: {{ $kv.mountPath }}
      {{- end }}
    {{- end }}
    {{- with .Values.driver.gpu }}
    gpu:
      name: {{ .name | default "nvidia.com/gpu" }}
      quantity: {{ .quantity | default 0 }}
    {{- end }}
    {{- include "sparkapp.driverlabels" . }}
    serviceAccount: {{ .Values.serviceAccount | default "default" }}
{{- end }}

{{/* Spark executor defines. */}}
{{- define "sparkapp.executor" }}
  executor:
    {{- include "sparkapp.executorlabels" . }}
    cores: {{ .Values.executor.cores | default 1 }}
    instances: {{ .Values.executor.instances | default 1 }}
    memory: {{ .Values.executor.memory | default "512m" }}
    {{- if .Values.executor.volumeMounts }}
    volumeMounts:
      {{- range $kv := .Values.executor.volumeMounts }}
      - name: {{ $kv.name }}
        mountPath: {{ $kv.mountPath }}
      {{- end }}
    {{- end }}
    {{- with .Values.executor.gpu }}
    gpu:
      name: {{ .name | default "nvidia.com/gpu" }}
      quantity: {{ .quantity | default 0 }}
    {{- end }}
{{- end }}