错误而执行Scala的构建与星火1.5.2和Scala 2.11.7
问题描述:
我有以下内容的简单的斯卡拉对象文件:错误而执行Scala的构建与星火1.5.2和Scala 2.11.7
import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._
import org.apache.spark.SparkConf
object X {
def main(args: Array[String]) {
val params = Map[String, String](
"abc" -> "22",)
println("Creating Spark Configuration");
val conf = new SparkConf().setAppName("X")
val sc = new SparkContext(conf)
val txtFileLines = sc.textFile("/tmp/x.txt", 2).cache()
val count = txtFileLines.count()
println("Count" + count)
}
}
我build.sbt样子:
name := "x"
version := "1.0"
scalaVersion := "2.11.7"
libraryDependencies += "org.apache.spark" %% "spark-core" % "1.5.2" % "provided"
我然后做SBT包来创建x.jar
下target/scala-2.11/
当我执行上面的代码为: spark-submit --class X --master local[2] x.jar
我收到以下错误:
Creating Spark Configuration
Exception in thread "main" java.lang.NoSuchMethodError: scala.Predef$.ArrowAssoc(Ljava/lang/Object;)Ljava/lang/Object;
at Sweeper$.main(Sweeper.scala:14)
at Sweeper.main(Sweeper.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:674)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:120)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
答
正如您在项目中使用Scala 2.11。您应该为Scala 2.11使用Spark核心库构建。 可以从这里下载spark-core_2.11 http://mvnrepository.com/search?q=Spark
在项目中引用spark-core_2.11 jar。
您的火花是2.10还是2.11火花? – Reactormonk
它的火花1.5.2 – Neel
问题是用什么版本的Scala来构建它。 Scala二进制文件在主要版本(即2.10和2.11)之间不兼容,Spark的默认Scala版本是2.10。 – zero323