spark kafka无效依赖项

mgdq6dx1  于 2021-06-06  发布在  Kafka
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我有一个基本的spark-kafka代码,我尝试运行以下代码:

import org.apache.spark.SparkConf
import org.apache.spark.streaming.{Seconds, StreamingContext}
import org.apache.spark.storage.StorageLevel

import java.util.regex.Pattern
import java.util.regex.Matcher
import org.apache.spark.streaming.kafka._
import kafka.serializer.StringDecoder
import Utilities._
object WordCount {
  def main(args: Array[String]): Unit = {

    val ssc = new StreamingContext("local[*]", "KafkaExample", Seconds(1))

    setupLogging()

    // Construct a regular expression (regex) to extract fields from raw Apache log lines
    val pattern = apacheLogPattern()

    // hostname:port for Kafka brokers, not Zookeeper
    val kafkaParams = Map("metadata.broker.list" -> "localhost:9092")
    // List of topics you want to listen for from Kafka
    val topics = List("testLogs").toSet
    // Create our Kafka stream, which will contain (topic,message) pairs. We tack a
    // map(_._2) at the end in order to only get the messages, which contain individual
    // lines of data.
    val lines = KafkaUtils.createDirectStream[String, String, StringDecoder, StringDecoder](
      ssc, kafkaParams, topics).map(_._2)

    // Extract the request field from each log line
    val requests = lines.map(x => {val matcher:Matcher = pattern.matcher(x); if (matcher.matches()) matcher.group(5)})

    // Extract the URL from the request
    val urls = requests.map(x => {val arr = x.toString().split(" "); if (arr.size == 3) arr(1) else "[error]"})

    // Reduce by URL over a 5-minute window sliding every second
    val urlCounts = urls.map(x => (x, 1)).reduceByKeyAndWindow(_ + _, _ - _, Seconds(300), Seconds(1))

    // Sort and print the results
    val sortedResults = urlCounts.transform(rdd => rdd.sortBy(x => x._2, false))
    sortedResults.print()

    // Kick it off
    ssc.checkpoint("/home/")
    ssc.start()
    ssc.awaitTermination()

  }

}

我使用intellijide,并使用sbt创建scala项目。build.sbt文件的详细信息如下:

name := "Sample"

version := "1.0"

organization := "com.sundogsoftware"

scalaVersion := "2.11.8"

libraryDependencies ++= Seq(
  "org.apache.spark" %% "spark-core" % "2.2.0" % "provided",
  "org.apache.spark" %% "spark-streaming" % "1.4.1",
  "org.apache.spark" %% "spark-streaming-kafka" % "1.4.1",
  "org.apache.hadoop" % "hadoop-hdfs" % "2.6.0"

)

但是,当我尝试构建代码时,会产生以下错误:
error:scalac:加载类文件“streamingcontext.class”时检测到缺少或无效的依赖项。无法访问org.apache.spark包中的类型日志,因为缺少该类型日志(或其依赖项)。检查生成定义是否缺少依赖项或存在冲突依赖项(重新运行 -Ylog-classpath 如果“streamingcontext.class”是针对org.apache.spark的不兼容版本编译的,则完整重建可能会有所帮助。
error:scalac:加载类文件“dstream.class”时检测到缺少或无效的依赖项。无法访问org.apache.spark包中的类型日志,因为缺少该类型日志(或其依赖项)。检查生成定义是否缺少依赖项或存在冲突依赖项(重新运行 -Ylog-classpath 如果“dstream.class”是针对org.apache.spark的不兼容版本编译的,则完整重建可能会有所帮助。

ecbunoof

ecbunoof1#

当同时使用不同的spark库时,所有lib的版本应该总是匹配的。
另外,你使用的Kafka版本也很重要,所以应该是例如: spark-streaming-kafka-0-10_2.11 ```
...
scalaVersion := "2.11.8"
val sparkVersion = "2.2.0"

libraryDependencies ++= Seq(
"org.apache.spark" %% "spark-core" % sparkVersion % "provided",
"org.apache.spark" %% "spark-streaming" % sparkVersion,
"org.apache.spark" %% "spark-streaming-kafka-0-10_2.11" % sparkVersion,
"org.apache.hadoop" % "hadoop-hdfs" % "2.6.0"

)
如果您需要检查应该使用的确切依赖项,这是一个有用的站点:https://search.maven.org/

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