14 - MLSQL on k8s（2） - Spark on k8s

Spark on k8s，可能都有听说，可是笔者从网上没有找到一个可以顺利运行的例子。笔者也是走了几个弯路才顺利跑通的。下面笔者将基于spark native方式部署，分别讲解如下三种模式...

祝威廉

602人浏览 · 2021-02-20 12:21:27

祝威廉 · 2021-02-20 12:21:27 发布

Spark on k8s，可能都有听说，可是笔者从网上没有找到一个可以顺利运行的例子。笔者也是走了几个弯路才顺利跑通的。下面笔者将基于spark native方式部署，分别讲解如下三种模式：

spark submit从物理机cluster模式提交
spark submit从物理机client模式提交
spark submit从container client模式提交

首先，先构建spark的镜像，因为镜像要被共享，因此要放到一个镜像库中，笔者用docker搭了一个镜像库：

# https://hub.docker.com/_/registry
docker pull registry
docker run --insecure-registry -d -p 5000:5000 --restart always --name registry registry:2


# 可以通过curl来访问：
curl -XGET http://172.16.2.66:5000/v2/_catalog
curl -XGET http://172.16.2.66:5000/v2/mlsql/tags/list（查看mlsql库下的tags）

在Spark包下，生成镜像并推送到镜像库：

 tar xvf spark-3.0.2-SNAPSHOT-bin-hadoop2.7.tar
 cd spark-3.0.2-SNAPSHOT-bin-hadoop2.7
  
 docker build -t 172.16.2.66:5000/spark:v3.0 -f kubernetes/dockerfiles/spark/Dockerfile .
 docker push 172.16.2.66:5000/spark:v3.0


docker images
REPOSITORY                                                       TAG             IMAGE ID       CREATED         SIZE
172.16.2.66:5000/spark                                           v3.0            ff6692727fad   5 days ago      500MB


curl -XGET http://172.16.2.66:5000/v2/spark/tags/list
{"name":"spark","tags":["v3.0"]}

建立Spark访问k8s apiserver账户：

kubectl create serviceaccount spark
kubectl create clusterrolebinding spark-role --clusterrole=create --serviceaccount=default:spark --namespace=defaul

1. spark submit从物理机cluster模式提交：

./bin/spark-submit \
--master k8s://https://172.16.2.62:6443 \
--deploy-mode cluster \
--name spark-pi \
--class org.apache.spark.examples.SparkPi \
--conf spark.executor.instances=2 \
--conf spark.kubernetes.container.image=172.16.2.66:5000/spark:v3.0 \
--conf spark.kubernetes.driver.pod.name=spark-pi-driver-ca \
--conf spark.kubernetes.namespace=default \
--conf spark.kubernetes.authenticate.driver.serviceAccountName=spark \
--conf spark.kubernetes.authenticate.submission.caCertFile=/opt/kubernetes/ssl/ca.pem \
local:///opt/spark/examples/jars/spark-examples_2.12-3.0.2-SNAPSHOT.jar

会遇到如下错误：http: server gave HTTP response to HTTPS client。

在/etc/docker/daemon.json增加：

{
  "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"],
  "insecure-registries":["172.16.2.66:5000"]
}

哇！终于可以运行起来了，是不是有点儿小兴奋啊！

注意这两个参数：
spark.kubernetes.authenticate.driver.serviceAccountName  指定apiserver的账户
spark.kubernetes.authenticate.submission.caCertFile      apiserver的ca证书

2. spark submit从物理机client模式提交

./bin/spark-submit --master k8s://https://172.16.2.62:6443 \
            --deploy-mode client \
            --name spark-pi \
            --class org.apache.spark.examples.SparkPi \
            --conf spark.kubernetes.namespace=default \
            --conf spark.kubernetes.authenticate.driver.serviceAccountName=spark \
            --conf spark.executor.instances=1 \
            --conf spark.kubernetes.container.image=172.16.2.66:5000/spark:v3.0 \
            --conf spark.driver.host=172.16.2.62 \
            --conf spark.kubernetes.authenticate.caCertFile=/opt/kubernetes/ssl/ca.pem \
            /root/k8s/spark/spark-3.0.2-SNAPSHOT-bin-hadoop2.7/examples/jars/spark-examples_2.12-3.0.2-SNAPSHOT.jar


spark.kubernetes.authenticate.driver.serviceAccountName  指定apiserver的账户
spark.kubernetes.authenticate.caCertFile                 apiserver的ca证书，这个参数和cluster模式不同，笔者真实把spark on k8s的参数仔细看了一遍才测通的
spark.driver.host                                        client所在机器的地址

哇！so easy！那么deployment应该也很容易吧！

3. spark submit从container client模式提交

cat > spark-hello.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: spark-hello
  namespace: default
spec:
  selector:
    matchLabels:
      app: spark-hello
  strategy:
    rollingUpdate:
      maxUnavailable: 0
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: spark-hello
    spec:
      containers:
      - name: spark-hello     
        args:
          - >-
            echo "/opt/spark/bin/spark-submit --master k8s://https://172.16.2.62:6443
            --deploy-mode client
            --name spark-pi
            --class org.apache.spark.examples.SparkPi
            --conf spark.kubernetes.namespace=default
            --conf spark.kubernetes.authenticate.driver.serviceAccountName=spark
            --conf spark.jars.ivy=/tmp/.ivy
            --conf spark.executor.instances=2
            --conf spark.kubernetes.container.image=172.16.2.66:5000/spark:v3.0
            --conf spark.driver.host=$POD_IP
            local:///opt/spark/examples/jars/spark-examples_2.12-3.0.2-SNAPSHOT.jar" | bash
        command:
          - /bin/sh
          - '-c'
        env:
          - name: POD_IP
            valueFrom:
              fieldRef:
                fieldPath: status.podIP          
        image: '172.16.2.66:5000/spark:v3.0'
        imagePullPolicy: Always
EOF


kubectl create -f spark-hello.yaml


kubectl get pods
NAME                                       READY   STATUS    RESTARTS   AGE
spark-hello-7c697b87cc-2n75m               0/1     Error     1          10

果然不是一帆风顺，来看看日志吧：

kubectl logs spark-hello-7c697b87cc-2n75m


21/02/07 09:42:11 INFO KerberosConfDriverFeatureStep: You have not specified a krb5.conf file locally or via a ConfigMap. Make sure that you have the krb5.conf locally on the driver image.
Exception in thread "main" java.io.IOException: failure to login
  at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:841)
  at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:777)
  at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:650)
  at org.apache.spark.util.Utils$.$anonfun$getCurrentUserName$1(Utils.scala:2412)
  at scala.Option.getOrElse(Option.scala:189)
  at org.apache.spark.util.Utils$.getCurrentUserName(Utils.scala:2412)
  at org.apache.spark.deploy.k8s.features.BasicDriverFeatureStep.configurePod(BasicDriverFeatureStep.scala:119)
  at org.apache.spark.deploy.k8s.submit.KubernetesDriverBuilder.$anonfun$buildFromFeatures$3(KubernetesDriverBuilder.scala:59)
  at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126)
  at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122)
  at scala.collection.immutable.List.foldLeft(List.scala:89)
  at org.apache.spark.deploy.k8s.submit.KubernetesDriverBuilder.buildFromFeatures(KubernetesDriverBuilder.scala:58)
  at org.apache.spark.deploy.k8s.submit.Client.run(KubernetesClientApplication.scala:100)
  at org.apache.spark.deploy.k8s.submit.KubernetesClientApplication.$anonfun$run$3(KubernetesClientApplication.scala:235)
  at org.apache.spark.deploy.k8s.submit.KubernetesClientApplication.$anonfun$run$3$adapted(KubernetesClientApplication.scala:229)
  at org.apache.spark.util.Utils$.tryWithResource(Utils.scala:2539)
  at org.apache.spark.deploy.k8s.submit.KubernetesClientApplication.run(KubernetesClientApplication.scala:229)
  at org.apache.spark.deploy.k8s.submit.KubernetesClientApplication.start(KubernetesClientApplication.scala:202)
  at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:928)
  at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:180)
  at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:203)
  at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:90)
  at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:1007)
  at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:1016)
  at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: javax.security.auth.login.LoginException: java.lang.NullPointerException: invalid null input: name
  at jdk.security.auth/com.sun.security.auth.UnixPrincipal.<init>(Unknown Source)
  at jdk.security.auth/com.sun.security.auth.module.UnixLoginModule.login(Unknown Source)
  at java.base/javax.security.auth.login.LoginContext.invoke(Unknown Source)
  at java.base/javax.security.auth.login.LoginContext$4.run(Unknown Source)
  at java.base/javax.security.auth.login.LoginContext$4.run(Unknown Source)
  at java.base/java.security.AccessController.doPrivileged(Native Method)
  at java.base/javax.security.auth.login.LoginContext.invokePriv(Unknown Source)
  at java.base/javax.security.auth.login.LoginContext.login(Unknown Source)
  at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:815)
  at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:777)
  at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:650)
  at org.apache.spark.util.Utils$.$anonfun$getCurrentUserName$1(Utils.scala:2412)
  at scala.Option.getOrElse(Option.scala:189)
  at org.apache.spark.util.Utils$.getCurrentUserName(Utils.scala:2412)
  at org.apache.spark.deploy.k8s.features.BasicDriverFeatureStep.configurePod(BasicDriverFeatureStep.scala:119)
  at org.apache.spark.deploy.k8s.submit.KubernetesDriverBuilder.$anonfun$buildFromFeatures$3(KubernetesDriverBuilder.scala:59)
  at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126)
  at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122)
  at scala.collection.immutable.List.foldLeft(List.scala:89)
  at org.apache.spark.deploy.k8s.submit.KubernetesDriverBuilder.buildFromFeatures(KubernetesDriverBuilder.scala:58)
  at org.apache.spark.deploy.k8s.submit.Client.run(KubernetesClientApplication.scala:100)
  at org.apache.spark.deploy.k8s.submit.KubernetesClientApplication.$anonfun$run$3(KubernetesClientApplication.scala:235)
  at org.apache.spark.deploy.k8s.submit.KubernetesClientApplication.$anonfun$run$3$adapted(KubernetesClientApplication.scala:229)
  at org.apache.spark.util.Utils$.tryWithResource(Utils.scala:2539)
  at org.apache.spark.deploy.k8s.submit.KubernetesClientApplication.run(KubernetesClientApplication.scala:229)
  at org.apache.spark.deploy.k8s.submit.KubernetesClientApplication.start(KubernetesClientApplication.scala:202)
  at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:928)
  at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:180)
  at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:203)
  at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:90)
  at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:1007)
  at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:1016)
  at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)


  at java.base/javax.security.auth.login.LoginContext.invoke(Unknown Source)
  at java.base/javax.security.auth.login.LoginContext$4.run(Unknown Source)
  at java.base/javax.security.auth.login.LoginContext$4.run(Unknown Source)
  at java.base/java.security.AccessController.doPrivileged(Native Method)
  at java.base/javax.security.auth.login.LoginContext.invokePriv(Unknown Source)
  at java.base/javax.security.auth.login.LoginContext.login(Unknown Source)
  at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:815)
  ... 24 more

这个问题笔者真是用了半天的时间解决的，网上各种找，没有一个说到点儿上的。笔者仔细分析了一下，就是在container中spark submit的用户没有指定名字。然后有了两个假设：

构建容器的时候是否可以指定用户
deployment启动容器的时候是否可以指定用户

笔者仔细的看了spark的Dockerfile:

# Specify the User that the actual main process will run as
USER ${spark_uid}

网上说这样指定就可以通过，但是并没有。然后笔者查看k8s文档，找到了这个参数：

        securityContext:
          runAsUser: 0

这样可以使容器以root用户运行。0指root用户的uid。(生产环境需要指定用户启动，在构建竟像时候需要建一个用户，执行脚本切换到这个用户，比如建hdfs用户，修改这一行：-streaming.driver.port 9003" | su hdfs | chown -R hdfs /opt/spark/work-dir | bash)

# 把这个参数加上后：
apiVersion: apps/v1
kind: Deployment
metadata:
  name: spark-hello
  namespace: default
spec:
  selector:
    matchLabels:
      app: spark-hello
  strategy:
    rollingUpdate:
      maxUnavailable: 0
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: spark-hello
    spec:
      containers:
      - name: spark-hello     
        args:
          - >-
            echo "/opt/spark/bin/spark-submit --master k8s://https://172.16.2.62:6443
            --deploy-mode client
            --name spark-pi
            --class org.apache.spark.examples.SparkPi
            --conf spark.kubernetes.namespace=default
            --conf spark.kubernetes.authenticate.driver.serviceAccountName=spark
            --conf spark.jars.ivy=/tmp/.ivy
            --conf spark.executor.instances=2
            --conf spark.kubernetes.container.image=172.16.2.66:5000/spark:v3.0
            --conf spark.driver.host=$POD_IP
            local:///opt/spark/examples/jars/spark-examples_2.12-3.0.2-SNAPSHOT.jar" | bash
        command:
          - /bin/sh
          - '-c'
        env:
          - name: POD_IP
            valueFrom:
              fieldRef:
                fieldPath: status.podIP          
        image: '172.16.2.66:5000/spark:v3.0'
        imagePullPolicy: Always
        securityContext:
          runAsUser: 0

kubectl delete deploy spark-hello
kubectl create -f spark-hello.yaml


# 继续报错：
Exception in thread "main" io.fabric8.kubernetes.client.KubernetesClientException: Failure executing: POST at: https://172.16.2.62:6443/api/v1/namespaces/default/pods. Message: Forbidden!Configured service account doesn't have access. Service account may have been revoked. pods is forbidden: User "system:serviceaccount:default:default" cannot create resource "pods" in API group "" in the namespace "default".
  at io.fabric8.kubernetes.client.dsl.base.OperationSupport.requestFailure(OperationSupport.java:568)
  at io.fabric8.kubernetes.client.dsl.base.OperationSupport.assertResponseCode(OperationSupport.java:505)
  at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:471)
  at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleResponse(OperationSupport.java:430)
  at io.fabric8.kubernetes.client.dsl.base.OperationSupport.handleCreate(OperationSupport.java:251)
  at io.fabric8.kubernetes.client.dsl.base.BaseOperation.handleCreate(BaseOperation.java:815)
  at io.fabric8.kubernetes.client.dsl.base.BaseOperation.create(BaseOperation.java:333)
  at org.apache.spark.deploy.k8s.submit.Client.run(KubernetesClientApplication.scala:129)
  at org.apache.spark.deploy.k8s.submit.KubernetesClientApplication.$anonfun$run$3(KubernetesClientApplication.scala:235)
  at org.apache.spark.deploy.k8s.submit.KubernetesClientApplication.$anonfun$run$3$adapted(KubernetesClientApplication.scala:229)
  at org.apache.spark.util.Utils$.tryWithResource(Utils.scala:2539)
  at org.apache.spark.deploy.k8s.submit.KubernetesClientApplication.run(KubernetesClientApplication.scala:229)
  at org.apache.spark.deploy.k8s.submit.KubernetesClientApplication.start(KubernetesClientApplication.scala:202)
  at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:928)
  at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:180)
  at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:203)
  at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:90)
  at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:1007)
  at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:1016)
  at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

spark submit明明指定了spark.kubernetes.authenticate.driver.serviceAccountName，为什么没有生效呢？

笔者这次没有浪费太多时间，肯定是deployment文件的问题，笔者就去k8s看deployment的文档，参数多的让人看着头疼，但最终还是找到了。

serviceAccountName: spark

完整的脚本：

# 把这个参数加上后：
apiVersion: apps/v1
kind: Deployment
metadata:
  name: spark-hello
  namespace: default
spec:
  selector:
    matchLabels:
      app: spark-hello
  strategy:
    rollingUpdate:
      maxUnavailable: 0
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: spark-hello
    spec:
      serviceAccountName: spark
      containers:
      - name: spark-hello     
        args:
          - >-
            echo "/opt/spark/bin/spark-submit --master k8s://https://172.16.2.62:6443
            --deploy-mode client
            --name spark-pi
            --class org.apache.spark.examples.SparkPi
            --conf spark.kubernetes.namespace=default
            --conf spark.kubernetes.authenticate.driver.serviceAccountName=spark
            --conf spark.jars.ivy=/tmp/.ivy
            --conf spark.executor.instances=2
            --conf spark.kubernetes.container.image=172.16.2.66:5000/spark:v3.0
            --conf spark.driver.host=$POD_IP
            local:///opt/spark/examples/jars/spark-examples_2.12-3.0.2-SNAPSHOT.jar" | bash
        command:
          - /bin/sh
          - '-c'
        env:
          - name: POD_IP
            valueFrom:
              fieldRef:
                fieldPath: status.podIP          
        image: '172.16.2.66:5000/spark:v3.0'
        imagePullPolicy: Always
        securityContext:
          runAsUser: 0

kubectl delete deploy spark-hello
kubectl create -f spark-hello.yaml


kubectl get pods
NAME                                       READY   STATUS    RESTARTS   AGE
spark-hello-69bdffdcbb-zhgf8               1/1     Running   1          29s
spark-pi-c103a7777beb81d2-exec-1           1/1     Running   0          8s
spark-pi-c103a7777beb81d2-exec-2           1/1     Running   0          8




kubectl logs spark-hello-69bdffdcbb-zhgf8
21/02/07 09:56:17 INFO DAGScheduler: Job 0 finished: reduce at SparkPi.scala:38, took 1.249581 s
Pi is roughly 3.143515717578588
21/02/07 09:56:17 INFO SparkUI: Stopped Spark web UI at http://10.244.0.72:4040

笔者用了一天的时间把这几种模式调通了，对于一个接触三天的k8s小白来说已经很满足了。最大的感触是，遇到问题要仔细分析，不断的提出可能的假设，然后去验证，因为很多问题网上是找不到答案的，只有提高自己的分析与处理问题的能力，才能应对更难的问题。

图片素材1：瑞士卢塞恩老城

图片素材2：互联网

往期回顾：

1 - MLSQL介绍

2 - MLSQL加载JDBC数据源深度剖析

3 - MLSQL DSL-你准备好搞自己的DSL了吗

4 - 教你如何实现 Hive 列权限控制

5 - 教你如何实现 JDBC 列权限控制

6 - 教你如何使用Spark分布式执行Python脚本计算数据

7 - 教你如何读取MySQL binlog

8 - 请开启解析Canal binlog为Spark DataFrame的正确姿势

9 - 教你如何用注册发现模式--动态扩展

10 - 教你如何动态注册Spark UDF和UDAF

11 - 对MLSQL支持逻辑处理的思考

12 - 你足够了解MLSQL吗？- jvm profiler

13 - MLSQL on k8s（1） - k8s安装

喜欢就点击最上方的[ MLSQL之道 ]关注下吧！右下角还有在看哦！

源码地址：

https://github.com/latincross/mlsqlwechat（resource/c14）

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