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运行 Spark 示例:ClassNotFoundException: org.apache.kafka.common.serialization.StringDeserializer

[英]Running Spark example: ClassNotFoundException: org.apache.kafka.common.serialization.StringDeserializer

我是 spark 新手,还没有编写我的第一个 spark 应用程序,并且仍在研究这是否适合我们的目的。 目前只是试图运行访问kafka的spark附带的示例示例

我尝试使用两种方式运行开箱即用的 kafka 示例,但没有成功并出现相同的错误。

  1. 使用 helm/kubernetes 从 spark
  2. 从手动本地构建

我搜索现有帖子,但不太明白为什么开箱即用似乎不起作用。

Spark 因 org.apache.kafka.common.serialization.StringDeserializer 出现 NoClassDefFoundError 而失败

Apache Kafka:...StringDeserializer 不是...Deserializer 的实例

为什么 Spark 应用程序因“线程“主”java.lang.NoClassDefFoundError: ...StringDeserializer 中的异常而失败?

头盔/Kubernetes

Clone https://github.com/bitnami/charts.git bitnami/spark
using
registry: docker.io
  repository: bitnami/spark
  tag: 2.4.5-debian-10-r87
  tag: 2.4.5-debian-10-r94
Got success with ./bin/run-example SparkPi 10
But got error with ./bin/run-example streaming.JavaDirectKafkaWordCount myBroker myConsumerGroup myTopic

    INFO StreamingExamples: Setting log level to [WARN] for streaming example. To override add a custom log4j.properties to the classpath.
    Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/kafka/common/serialization/StringDeserializer
        at org.apache.spark.examples.streaming.JavaDirectKafkaWordCount.main(JavaDirectKafkaWordCount.java:78)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
        at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:845)
        at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:161)
        at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:184)
        at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:86)
        at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:920)
        at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:929)
        at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
    Caused by: java.lang.ClassNotFoundException: org.apache.kafka.common.serialization.StringDeserializer
        at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
        ... 13 more

手动本地构建

Clone https://github.com/apache/spark.git
./build/mvn -DskipTests clean package
[INFO] BUILD SUCCESS

RAN EXAMPLE SUCCESSFULLY
./bin/run-example SparkPi 10
Pi is roughly 3.1424111424111425

RAN KAFKA EXAMPLE WITH ClassNotFoundException
./bin/run-example streaming.JavaDirectKafkaWordCount myBroker myConsumerGroup myTopic

    INFO StreamingExamples: Setting log level to [WARN] for streaming example. To override add a custom log4j.properties to the classpath.
    Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/kafka/common/serialization/StringDeserializer
        at org.apache.spark.examples.streaming.JavaDirectKafkaWordCount.main(JavaDirectKafkaWordCount.java:78)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
        at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:934)
        at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:180)
        at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:203)
        at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:90)
        at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:1013)
        at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:1022)
        at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
    Caused by: java.lang.ClassNotFoundException: org.apache.kafka.common.serialization.StringDeserializer
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 13 more

您需要在 classpath 上使用kafka-clients (它应该包含在spark-sql-kafka-0-10一部分中,Spark 默认提供,因此您必须下载它,并将其添加到 Spark libs 目录中)

注意:Spark“流式传输”已弃用。 你想要结构化

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