spark streaming中找不到kafkautils类

vh0rcniy 于 2021-06-08 发布在 Kafka

关注(0)|答案(9)|浏览(493)

我刚刚开始使用spark流媒体，我正在尝试构建一个示例应用程序来计算Kafka流中的单词。尽管它是用 sbt package ，当我运行它时，我得到 NoClassDefFoundError . 这篇文章似乎也有同样的问题，但解决方案是maven的，我还没能用sbt重现它。 KafkaApp.scala :

import org.apache.spark._
import org.apache.spark.streaming._
import org.apache.spark.streaming.kafka._

object KafkaApp {
  def main(args: Array[String]) {

    val conf = new SparkConf().setAppName("kafkaApp").setMaster("local[*]")
    val ssc = new StreamingContext(conf, Seconds(1))
    val kafkaParams = Map(
        "zookeeper.connect" -> "localhost:2181",
        "zookeeper.connection.timeout.ms" -> "10000",
        "group.id" -> "sparkGroup"
    )

    val topics = Map(
        "test" -> 1
    )

    // stream of (topic, ImpressionLog)
    val messages = KafkaUtils.createStream(ssc, kafkaParams, topics, storage.StorageLevel.MEMORY_AND_DISK)
    println(s"Number of words: %{messages.count()}")
  }
}
``` `build.sbt` :

name := "Simple Project"

version := "1.1"

scalaVersion := "2.10.4"

libraryDependencies ++= Seq(
"org.apache.spark" %% "spark-core" % "1.1.1",
"org.apache.spark" %% "spark-streaming" % "1.1.1",
"org.apache.spark" %% "spark-streaming-kafka" % "1.1.1"
)

resolvers += "Akka Repository" at "http://repo.akka.io/releases/"

我提交时附带：

bin/spark-submit
--class "KafkaApp"
--master local[4]
target/scala-2.10/simple-project_2.10-1.1.jar

错误：

14/12/30 19:44:57 INFO AkkaUtils: Connecting to HeartbeatReceiver: akka.tcp://sparkDriver@192.168.5.252:65077/user/HeartbeatReceiver
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/spark/streaming/kafka/KafkaUtils$
at KafkaApp$.main(KafkaApp.scala:28)
at KafkaApp.main(KafkaApp.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.spark.deploy.SparkSubmit$.launch(SparkSubmit.scala:329)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:75)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.ClassNotFoundException: org.apache.spark.streaming.kafka.KafkaUtils$
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

apache-kafka apache-spark sbt

来源：https://stackoverflow.com/questions/27710887/kafkautils-class-not-found-in-spark-streaming

9条答案

按热度按时间

sg2wtvxw1#

使用 --packages 争论 spark-submit ，它以 group:artifact:version,...

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polkgigr2#

import org.apache.spark.streaming.kafka.KafkaUtils

在build.sbt中使用以下命令

name := "kafka"

version := "0.1"

scalaVersion := "2.11.12"

retrieveManaged := true

fork := true

//libraryDependencies += "org.apache.spark" % "spark-streaming_2.11" % "2.2.0"
//libraryDependencies += "org.apache.spark" % "spark-streaming-kafka-0-8_2.11" % "2.1.0"

libraryDependencies += "org.apache.spark" %% "spark-core" % "2.2.0"

//libraryDependencies += "org.apache.spark" %% "spark-sql" % "2.2.0"

libraryDependencies += "org.apache.spark" %% "spark-streaming" % "2.2.0"

// https://mvnrepository.com/artifact/org.apache.spark/spark-streaming-kafka-0-8
libraryDependencies += "org.apache.spark" %% "spark-streaming-kafka-0-8" % "2.2.0" % "provided"

// https://mvnrepository.com/artifact/org.apache.spark/spark-streaming-kafka-0-8-assembly
libraryDependencies += "org.apache.spark" %% "spark-streaming-kafka-0-8-assembly" % "2.2.0"

这将解决问题

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w6lpcovy3#

跟随 build.sbt 为我工作。它要求你也把 sbt-assembly 插件在一个文件下 projects/ 目录。
构建.sbt

name := "NetworkStreaming" // https://github.com/sbt/sbt-assembly/blob/master/Migration.md#upgrading-with-bare-buildsbt

libraryDependencies ++= Seq(
  "org.apache.spark" % "spark-streaming_2.10" % "1.4.1",
  "org.apache.spark" % "spark-streaming-kafka_2.10" % "1.4.1",         // kafka
  "org.apache.hbase" % "hbase" % "0.92.1",
  "org.apache.hadoop" % "hadoop-core" % "1.0.2",
  "org.apache.spark" % "spark-mllib_2.10" % "1.3.0"
)

mergeStrategy in assembly := {
  case m if m.toLowerCase.endsWith("manifest.mf")          => MergeStrategy.discard
  case m if m.toLowerCase.matches("meta-inf.*\\.sf$")      => MergeStrategy.discard
  case "log4j.properties"                                  => MergeStrategy.discard
  case m if m.toLowerCase.startsWith("meta-inf/services/") => MergeStrategy.filterDistinctLines
  case "reference.conf"                                    => MergeStrategy.concat
  case _                                                   => MergeStrategy.first
}

项目/插件.sbt addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.1")

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2g32fytz4#

您还可以下载jar文件并将其放在spark lib文件夹中，因为它没有与spark一起安装，而不是拼命打赌sbt build.sbt是否可以工作。
http://central.maven.org/maven2/org/apache/spark/spark-streaming-kafka-0-10_2.10/2.1.1/spark-streaming-kafka-0-10_2.10-2.1.1.jar
复制到：
/usr/local/spark/spark-2.1.0-bin-hadoop2.6/jars/

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hwamh0ep5#

在外部添加了依赖项，项目-->属性-->java构建路径-->库-->添加外部jar并添加所需的jar。
这解决了我的问题。

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13z8s7eq6#

请尝试在提交应用程序时包含所有依赖项jar：
./spark submit--name“sampleapp”--deploy mode client--masterspark://host：7077--class com.stackexchange.sampleapp--jars$spark\u install\u dir/spark-streaming-kafka\u 2.10-1.3.0.jar，$kafka\u install\u dir/libs/kafka\u 2.10-0.8.2.0.jar，$kafka\u install\u dir/libs/metrics-core-2.2.0.jar，$kafka\u install\u dir/libs/zkclient-0.3.jar spark-example-1.0-snapshot.jar

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irtuqstp7#

spark submit不会自动放置包含kafkautils的包。你需要在你的项目jar里有。为此，您需要使用sbt assembly创建一个包罗万象的uberjar。下面是build.sbt的示例。
https://github.com/tdas/spark-streaming-external-projects/blob/master/kafka/build.sbt
显然，您还需要将程序集插件添加到sbt。
https://github.com/tdas/spark-streaming-external-projects/tree/master/kafka/project

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kiz8lqtg8#

使用spark 1.6为我完成这项工作，而不必麻烦地处理这么多外部jar。。。管理起来会很复杂。。。

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knpiaxh19#

遇到同样的问题，我通过构建带有依赖项的jar来解决它。
将下面的代码添加到pom.xml

<build>
    <sourceDirectory>src/main/java</sourceDirectory>
    <testSourceDirectory>src/test/java</testSourceDirectory>
    <plugins>
      <!--
                   Bind the maven-assembly-plugin to the package phase
        this will create a jar file without the storm dependencies
        suitable for deployment to a cluster.
       -->
      <plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <configuration>
          <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
          </descriptorRefs>
          <archive>
            <manifest>
              <mainClass></mainClass>
            </manifest>
          </archive>
        </configuration>
        <executions>
          <execution>
            <id>make-assembly</id>
            <phase>package</phase>
            <goals>
              <goal>single</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
</build>

mvn包提交“example jar with dependencies.jar”

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spark streaming中找不到kafkautils类

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