spark eclipse写wordcount

安装spark，见上文

http://blackproof.iteye.com/blog/2182393

 

配置window开发环境

window安装scala

下载scala http://www.scala-lang.org/files/archive/scala-2.10.4.msi

安装即可

 

window配置eclipse

下载eclipse  

http://downloads.typesafe.com/scalaide-pack/4.0.0-vfinal-luna-211-20150119/scala-SDK-4.0.0-vfinal-2.11-win32.win32.x86_64.zip

解压即可

 

写wordcount scala代码

创建scala 项目

新建scala object，命名WordCount

代码如下

package com.dirk.test

import org.apache.spark.SparkContext
import org.apache.spark.SparkContext.rddToPairRDDFunctions
import scala.collection.mutable.ListBuffer
import org.apache.spark.SparkConf


object WordCount {  
    def main(args: Array[String]){  
      if(args.length != 3){  
        println("usage: com.qiurc.test.WordCount   
")  
        return  
      }  
      val jars = ListBuffer[String]()
      jars.+=("/home/hadoop-cdh/app/test/sparktest/aa.jar") //aa.jar发布位置
      val conf = new SparkConf()
      
      conf.setMaster(args(0))//设置spark master url
      
      .setAppName("word count")
      
      .setJars(jars)//解决找不到jar包的问题
      
      .set("spark.executor.memory","200m")
      
      val sc = new SparkContext(conf)
      

      val textFile  = sc.textFile(args(1))  
      val result = textFile.flatMap(_.split(" "))  
              .map(word => (word, 1)).reduceByKey(_ + _)  
      result.saveAsTextFile(args(2))  
        
    }  
}  

 打包scala项目，和java项目打jar相同，名为aa.jar，

  jar包发布位置为

/home/hadoop-cdh/app/test/sparktest/aa.jar

 

  发布到spark服务器上

  写运行脚本

#!/usr/bin/env bash  

$SPARK_HOME/bin/spark-submit --name SparkWordCount --class com.dirk.test.WordCount --master spark://host143:7077 --executor-memory 512M --total-executor-cor
es 1 aa.jar spark://host143:7077 hdfs://XXX/user/dirk.zhang/data/word.txt hdfs://XXX/user/dirk.zhang/output

遇到的问题

1.参数解释 参数1为spark master url，参数2为hdfs输入，参数3位hdfs输出，xxx为HA的defaultFS

2.找不到class文件的原因是缺少setJars(jars)

 

参考

http://bit1129.iteye.com/blog/2172164 

http://www.tuicool.com/articles/qq2mQj