开发准备:
jdk1.8.45
spark-2.0.0-bin-hadoop2.7(windows下和linux个留一份)
Linux系统(centos或其它)
spark安装环境
hadoop-2.7.2(linux一份)
Hadoop安装环境
开发环境搭建步骤如下:
1. 下载scala-SDK-4.4.1-vfinal-2.11-win32.win32.x86_64.tgz
2. 解压压缩包,直接运行里面的eclipse
3. 创建scala project,并创建scala类WordCount
4. 右键工程属性,添加spark-2.0.0-bin-hadoop2.7下面所有的库,可自定义库放进来:
5. 编辑代码如下:
import org.apache.spark._
import SparkContext._ object WordCount {
def main(args: Array[String]) {
if (args.length != 3 ){
println("usage is org.test.WordCount <master> <input> <output>")
return
}
val sc = new SparkContext(args(0), "WordCount",
System.getenv("SPARK_HOME"), Seq(System.getenv("SPARK_TEST_JAR")))
val textFile = sc.textFile(args(1))
val result = textFile.flatMap(line => line.split("\\s+"))
.map(word => (word, 1)).reduceByKey(_ + _)
result.saveAsTextFile(args(2))
}
}
6. 右键类,导出jar文件:
7. 在spark部署路径执行(可以通过spark的日志找到spark的master地址):
./spark-submit --num-executors 1 --executor-memory 1g --class WordCount --master spark://10.130.41.59:7077 spark-wordcount-in-scala.jar spark://10.130.41.59:7077 hdfs://hadoop:9000/user/hadoop/input hdfs://hadoop:9000/user/hadoop/outspark
8. 参数解析:
可以执行./spark-submit --help获得帮助