Question

我正在编写一个脚本，试图让Cassandra和Spark一起工作，但我甚至无法编译程序。我使用SBT作为构建工具，我拥有所声明的程序所需的所有依赖项。我第一次运行sbt run它下载了依赖项，但是当它开始编译下面显示的scala代码时我会收到错误：

[info] Compiling 1 Scala source to /home/vagrant/ScalaTest/target/scala-2.10/classes...
[error] /home/vagrant/ScalaTest/src/main/scala/ScalaTest.scala:6: not found: type SparkConf
[error]                 val conf = new SparkConf(true)
[error]                                ^
[error] /home/vagrant/ScalaTest/src/main/scala/ScalaTest.scala:9: not found: type SparkContext
[error]                 val sc = new SparkContext("spark://192.168.10.11:7077", "test", conf)
[error]                              ^
[error] two errors found
[error] (compile:compileIncremental) Compilation failed
[error] Total time: 3 s, completed Jun 5, 2015 2:40:09 PM

这是SBT构建文件

lazy val root = (project in file(".")).
        settings(
                name := "ScalaTest",
                version := "1.0"

        )


libraryDependencies += "com.datastax.spark" %% "spark-cassandra-connector" % "1.3.0-M1"

这是实际的Scala程序

import com.datastax.spark.connector._

object ScalaTest {
        def main(args: Array[String]) {
                val conf = new SparkConf(true)
                        .set("spark.cassandra.connection.host", "127.0.0.1")

                val sc = new SparkContext("spark://192.168.10.11:7077", "test", conf)
        }
}

这是我的目录结构

- ScalaTest
  - build.sbt
  - project
  - src
    - main
      - scala
        - ScalaTest.scala
  - target

Answer 1

我不知道这是否是问题，但您并未导入SparkConf和SparkContext类定义。因此，请尝试添加到您的scala文件：

 import org.apache.spark.SparkConf
 import org.apache.spark.SparkContext

Scala程序没有看到通过SBT下载的依赖项

1 个答案: