我正在尝试运行像StructuredKafkaWordCount这样的示例。我从Spark Structured Streaming Programming guide开始。
我的代码是
package io.boontadata.spark.job1
import org.apache.spark.sql.SparkSession
object DirectKafkaAggregateEvents {
val FIELD_MESSAGE_ID = 0
val FIELD_DEVICE_ID = 1
val FIELD_TIMESTAMP = 2
val FIELD_CATEGORY = 3
val FIELD_MEASURE1 = 4
val FIELD_MEASURE2 = 5
def main(args: Array[String]) {
if (args.length < 3) {
System.err.println(s"""
|Usage: DirectKafkaAggregateEvents <brokers> <subscribeType> <topics>
| <brokers> is a list of one or more Kafka brokers
| <subscribeType> sample value: subscribe
| <topics> is a list of one or more kafka topics to consume from
|
""".stripMargin)
System.exit(1)
}
val Array(bootstrapServers, subscribeType, topics) = args
val spark = SparkSession
.builder
.appName("boontadata-spark-job1")
.getOrCreate()
import spark.implicits._
// Create DataSet representing the stream of input lines from kafka
val lines = spark
.readStream
.format("kafka")
.option("kafka.bootstrap.servers", bootstrapServers)
.option(subscribeType, topics)
.load()
.selectExpr("CAST(value AS STRING)")
.as[String]
// Generate running word count
val wordCounts = lines.flatMap(_.split(" ")).groupBy("value").count()
// Start running the query that prints the running counts to the console
val query = wordCounts.writeStream
.outputMode("complete")
.format("console")
.start()
query.awaitTermination()
}
}
我添加了以下 sbt 文件：
构建.sbt：
name := "boontadata-spark-job1"
version := "0.1"
scalaVersion := "2.11.7"
libraryDependencies += "org.apache.spark" % "spark-core_2.11" % "2.0.2" % "provided"
libraryDependencies += "org.apache.spark" % "spark-streaming_2.11" % "2.0.2" % "provided"
libraryDependencies += "org.apache.spark" % "spark-sql_2.11" % "2.0.2" % "provided"
libraryDependencies += "org.apache.spark" % "spark-sql-kafka-0-10_2.11" % "2.0.2"
libraryDependencies += "org.apache.spark" % "spark-streaming-kafka-0-10_2.11" % "2.0.2"
libraryDependencies += "org.apache.kafka" % "kafka-clients" % "0.10.1.1"
libraryDependencies += "org.apache.kafka" % "kafka_2.11" % "0.10.1.1"
// META-INF discarding
assemblyMergeStrategy in assembly := {
{
case PathList("META-INF", xs @ _*) => MergeStrategy.discard
case x => MergeStrategy.first
}
}
我还添加了 project/assembly.sbt
addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.3")
这将创建一个带有非罐子的 Uberprovided罐子。
我提交以下行：
spark-submit boontadata-spark-job1-assembly-0.1.jar ks1:9092,ks2:9092,ks3:9092 subscribe sampletopic
但我得到这个运行时错误：
Exception in thread "main" java.lang.ClassNotFoundException: Failed to find data source: kafka. Please find packages at https://cwiki.apache.org/confluence/display/SPARK/Third+Party+Projects
at org.apache.spark.sql.execution.datasources.DataSource.lookupDataSource(DataSource.scala:148)
at org.apache.spark.sql.execution.datasources.DataSource.providingClass$lzycompute(DataSource.scala:79)
at org.apache.spark.sql.execution.datasources.DataSource.providingClass(DataSource.scala:79)
at org.apache.spark.sql.execution.datasources.DataSource.sourceSchema(DataSource.scala:218)
at org.apache.spark.sql.execution.datasources.DataSource.sourceInfo$lzycompute(DataSource.scala:80)
at org.apache.spark.sql.execution.datasources.DataSource.sourceInfo(DataSource.scala:80)
at org.apache.spark.sql.execution.streaming.StreamingRelation$.apply(StreamingRelation.scala:30)
at org.apache.spark.sql.streaming.DataStreamReader.load(DataStreamReader.scala:124)
at io.boontadata.spark.job1.DirectKafkaAggregateEvents$.main(StreamingJob.scala:41)
at io.boontadata.spark.job1.DirectKafkaAggregateEvents.main(StreamingJob.scala)
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.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:736)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:185)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:210)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:124)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.ClassNotFoundException: kafka.DefaultSource
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.apache.spark.sql.execution.datasources.DataSource$$anonfun$5$$anonfun$apply$1.apply(DataSource.scala:132)
at org.apache.spark.sql.execution.datasources.DataSource$$anonfun$5$$anonfun$apply$1.apply(DataSource.scala:132)
at scala.util.Try$.apply(Try.scala:192)
at org.apache.spark.sql.execution.datasources.DataSource$$anonfun$5.apply(DataSource.scala:132)
at org.apache.spark.sql.execution.datasources.DataSource$$anonfun$5.apply(DataSource.scala:132)
at scala.util.Try.orElse(Try.scala:84)
at org.apache.spark.sql.execution.datasources.DataSource.lookupDataSource(DataSource.scala:132)
... 18 more
16/12/23 13:32:48 INFO spark.SparkContext: Invoking stop() from shutdown hook
有没有办法知道找不到哪个类，以便我可以在 maven.org 存储库中搜索该类。
lookupDataSource源代码似乎位于https://github.com/apache/spark/blob/83a6ace0d1be44f70e768348ae6688798c84343e/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource的第543 行。 scala，但我找不到与 Kafka 数据源的直接链接......
完整的源代码在这里：https ://github.com/boontadata/boontadata-streams/tree/ad0d0134ddb7664d359c8dca40f1d16ddd94053f