我正在尝试创建简单的Apache Spark应用程序，它将使用Datastax Cassandra连接器连接到Cassandra并执行一些操作并收到错误
Symbol 'type <none>.package.DataFrame' is missing from the classpath.
我的 build.sbt ：
name := "spark-app"
version := "1.0"
scalaVersion := "2.11.11"
libraryDependencies ++= Seq(
"com.datastax.spark" %% "spark-cassandra-connector" % "2.0.0",
"org.apache.spark" %% "spark-core" % "2.1.1" % "provided"
)
resolvers += "Spark Packages Repo" at "https://dl.bintray.com/spark-packages/maven"
我的简单应用：
package com.budgetbakers.be.dwh.spark
import com.datastax.spark.connector._
import org.apache.spark.{SparkConf, SparkContext}
object Distinct {
def main(args: Array[String]): Unit = {
val conf = new SparkConf(true)
.set("spark.cassandra.connection.host", "127.0.0.1")
val sc = new SparkContext(conf)
println(sc.cassandraTable("ks", "users").select("gender").distinct().collect().mkString(","))
sc.stop()
}
}
当我尝试 package 项目时，我得到以下编译错误：
[error] /.../Distinct.scala:18: Symbol 'type <none>.package.DataFrame' is missing from the classpath.
[error] This symbol is required by 'value com.datastax.spark.connector.package.dataFrame'.
[error] Make sure that type DataFrame is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
[error] A full rebuild may help if 'package.class' was compiled against an incompatible version of <none>.package.
[error] println(sc.cassandraTable("ks", "users").select("gender").distinct().collect().mkString(","))
[error] ^
Am I missing something? Maybe there is some dependency conflict?
我使用的应用程序版本：
-
cassandra：3.1
-
apache spark：2.1.1
-
spark cassandra connector：2.0.0
-
scala：2.11
-
sbt：0.13.15
-
sbt程序集插件：0.14.0
1 回答
尝试添加
spark-sql依赖项以及核心库 . 供将来参考，有示例构建文件here