Kafka-Spark群集的ClassNotFoundException

Question

I'm trying to run some .jar file made in scala-Spark 2.0.2. in my Spark-Kafka cluster. The code's here:

import java.util.HashMap



import org.apache.kafka.clients.producer.{KafkaProducer,ProducerConfig}
   import org.apache.spark.SparkConf
   import org.apache.spark.streaming._
   import org.apache.spark.streaming.kafka._

object sparkKafka{
  def main(args: Array[String]): Unit = {
    if(args.length < 4){
      System.err.println("Usage: sparkKafka <zkQuorum><group> <topics> <numThreads>")
      System.exit(1)
    }

val Array(zkQuorum, group, topics, numThreads) = args
val sparkConf = new SparkConf()
    .setAppName("sparkKafka")
val ssc = new StreamingContext(sparkConf, Seconds(2))
ssc.checkpoint("E:/temp/")

val topicMap = topics.split(",").map((_, numThreads.toInt)).toMap
val lines = KafkaUtils.createStream(ssc, zkQuorum, group, topicMap).map(_._2)
val words = lines.flatMap(_.split(" "))
val wordsCounts = words.map(x => (x, 1L))
    .reduceByKeyAndWindow(_ + _, _ - _, Minutes(10), Seconds(2), 2)
wordsCounts.print()

ssc.start()
ssc.awaitTermination()

}

}

I built .jar file named: kafka-spark.jar and scp-it to my node in spark2 folder so it could read it. Afterwards I went to start the script with:

bin/spark-submit  --class "sparkKafka" --master local[4] kafka-spark.jar hdp2.local:2181 group1 Topic-example 1 -verbose

The error I'm getting is like it said in the head of topic, or ClassNotFoundException: sparkKafka

[root@hdp2 spark2]# bin/spark-submit  --class "sparkKafka" --master local[4] kafka-spark.jar hdp2.local:2181 group1 Topic-example 1 -verbose
java.lang.ClassNotFoundException: sparkKafka
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:348)
        at org.apache.spark.util.Utils$.classForName(Utils.scala:225)
        at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:686)
        at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:185)
        at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:210)
        at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:124)
        at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

Where am I making mistake? Also I tried with full path to my jar file, but eihter I get that .jar not found or this error above. Also I tried without -v but I think it doesn't make any difference. It would be great if someone knows where is a problem. Thank you!

Answer 1

Did you try calling it like this

bin/spark-submit  --class "sparkKafka" --master local[4] kafka-spark.jar hdp2.local:2181 group1 Topic-example 1 -verbose

If that does not work you might want to extract content of kafka-spark.jar and check if it actually contains sparkKafka class.

Answer 2

Hava您将包添加到sparkKafka.scala吗？