Question

我正在关注他们的入门页面：https://spark.apache.org/docs/latest/quick-start.html 在倒数第二段代码中，我必须使用sbt将文件打包为.jar

我的build.sbt：

name := "Simple Project"

version := "1.0"

scalaVersion := "2.11.8"

libraryDependencies += "org.apache.spark" % "spark-sql" % "2.3.2"

我的SimpleApp.scala：

/* SimpleApp.scala */
import org.apache.spark.sql.SparkSession

object SimpleApp {
  def main(args: Array[String]) {
    val logFile = "/usr/local/spark/README.md" // Should be some file on your system
    val spark = SparkSession.builder.appName("Simple Application").getOrCreate()
    val logData = spark.read.textFile(logFile).cache()
    val numAs = logData.filter(line => line.contains("a")).count()
    val numBs = logData.filter(line => line.contains("b")).count()
    println(s"Lines with a: $numAs, Lines with b: $numBs")
    spark.stop()
  }
}

我将文件放在所需的正确目录中，并从/ usr / local / spark / examples /在哪里构建，运行sbt package。

然后我继续得到这个很长的错误：

test@test-ThinkPad-X230:/usr/local/spark/examples$ sbt package
[info] Loading project definition from /usr/local/spark/examples/project
[info] Loading settings for project examples from build.sbt ...
[info] Set current project to Simple Project (in build file:/usr/local/spark/examples/)
[info] Updating ...
[info] downloading https://repo1.maven.org/maven2/org/apache/avro/avro/1.7.7/avro-1.7.7.jar ...
[info]  [SUCCESSFUL ] org.apache.avro#avro;1.7.7!avro.jar (322ms)
[info] Done updating.
[info] Compiling 188 Scala sources and 125 Java sources to /usr/local/spark/examples/target/scala-2.11/classes ...
[error] /usr/local/spark/examples/src/main/scala/org/apache/spark/examples/LocalFileLR.scala:23:8: not found: object breeze
[error] import breeze.linalg.{DenseVector, Vector}
[error]        ^
[error] /usr/local/spark/examples/src/main/scala/org/apache/spark/examples/LocalFileLR.scala:39:19: not found: type DenseVector
[error]     DataPoint(new DenseVector(nums.slice(1, D + 1)), nums(0))
[error]                   ^
[error] /usr/local/spark/examples/src/main/scala/org/apache/spark/examples/LocalFileLR.scala:60:13: not found: value DenseVector
[error]     val w = DenseVector.fill(D) {2 * rand.nextDouble - 1}
[error]             ^
[error] /usr/local/spark/examples/src/main/scala/org/apache/spark/examples/LocalFileLR.scala:65:22: not found: value DenseVector
[error]       val gradient = DenseVector.zeros[Double](D)
[error]                      ^
[error] /usr/local/spark/examples/src/main/scala/org/apache/spark/examples/LocalKMeans.scala:26:8: not found: object breeze
[error] import breeze.linalg.{squaredDistance, DenseVector, Vector}
[error]        ^
[error] /usr/local/spark/examples/src/main/scala/org/apache/spark/examples/LocalKMeans.scala:42:27: not found: type DenseVector
[error]   def generateData: Array[DenseVector[Double]] = {
[error]                           ^
[error] /usr/local/spark/examples/src/main/scala/org/apache/spark/examples/LocalKMeans.scala:43:32: not found: type DenseVector
[error]     def generatePoint(i: Int): DenseVector[Double] = {
[error]                                ^
[error] /usr/local/spark/examples/src/main/scala/org/apache/spark/examples/LocalKMeans.scala:44:7: not found: value DenseVector
[error]       DenseVector.fill(D) {rand.nextDouble * R}
[error]       ^

，然后继续。我不能说我做错了什么。

Answer 1

发现了问题：build.sbt应该位于/spark/中，而不是/spark/examples

使用sbt打包JAR文件以获取Spark

1 个答案: