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  • SparkStreaming官方示例程序运行方式

    一、前置条件

        安装NetCat(有“瑞士军刀”之称,简称nc),输入如下命令:

    yum install -y nc

    二、方式一:直接运行官方Example

    2.1 打开一个shell,输入命令:nc -lk 9999

    2.2 打开另一个shell,切换到SPARK_HOME/bin目录,输入命令:

    ./run-example streaming.NetworkWordCount localhost 9999

    三、方式二:spark-shell

    3.1 打开一个shell,输入命令:nc -lk 9999

    3.2 打开另一个shell,输入命令:spark-shell,当出现提示符时,输入如下代码:

    import org.apache.spark.SparkConf
    import org.apache.spark.streaming.{ Seconds, StreamingContext }

    val ssc = new StreamingContext(sc, Seconds(1))

    val lines = ssc.socketTextStream("localhost", 9999)
    val words = lines.flatMap(_.split(" "))
    val wordCounts = words.map(x => (x, 1)).reduceByKey(_ + _)
    wordCounts.print()
    ssc.start()
    ssc.awaitTermination()

    四、方式三:手动编译jar,提交jar进行运行

    4.1 打开一个shell,输入命令:nc -lk 9999

    4.2 打开Scala IDE,输入如下代码:

    package test

    import org.apache.spark.SparkConf
    import org.apache.spark.streaming.{ Seconds, StreamingContext }

    object StreamingTest {
    def main(args: Array[String]) {
    val sparkConf = new SparkConf().setAppName("StreamingTest")
    val ssc = new StreamingContext(sparkConf, Seconds(1))

    val lines = ssc.socketTextStream("localhost", 9999)
    val words = lines.flatMap(_.split(" "))
    val wordCounts = words.map(x => (x, 1)).reduceByKey(_ + _)
    wordCounts.print()
    ssc.start()
    ssc.awaitTermination()
    }
    } 

      导出jar包:streamingtest.jar,上传到spark集群,执行如下命令:

    spark-submit --class test.StreamingTest streamingtest.jar
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  • 原文地址:https://www.cnblogs.com/liugh/p/6754775.html
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