I read the section Metrics on spark website. I wish to try it on the wordcount example, I can't make it work. spark/conf/metrics.properties : # Enable CsvSink for all instances *.sink.csv.class=org.apache.spark.metrics.sink.CsvSink # Polling period f…

Spark初步-从wordcount开始 spark中自带的example,有一个wordcount例子,我们逐步分析wordcount代码,开始我们的spark之旅. 准备工作 把README.md文件复制到当前的文件目录,启动jupyter,编写我们的代码. README.md文件在Spark的根目录下. from pyspark.sql import SparkSession from operator import add # 初始化spark实例,并把应用命名为wordcount sp…

Spark练习之wordcount 一.原理及其剖析 二.pom.xml 三.使用Java进行spark的wordcount练习 四.使用scala进行spark的wordcount练习 五.基于排序机制的wordcount 一.原理及其剖析 二.pom.xml <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0&…

之前测试的一些spark案例都是采用离线处理,spark streaming的流处理一样可以运行经典的wordcount. 基本环境: spark-2.0.0 scala-2.11.0 IDEA-15.0.6 创建项目,贴上代码: package org.iie import org.apache.log4j.{Level,Logger} import org.apache.spark.storage.StorageLevel import org.apache.spark.streaming.…

实例代码: import org.apache.spark.SparkConf; import org.apache.spark.api.java.JavaPairRDD; import org.apache.spark.api.java.JavaRDD; import org.apache.spark.api.java.JavaSparkContext; import org.apache.spark.api.java.function.FlatMapFunction; import org.…

1.启动 启动HDFS 启动spark的local模式./spark-shell 2.知识点 textFile: def textFile( path: String, minPartitions: Int = defaultMinPartitions): RDD[String] Filter: Return a new RDD containing only the elements that satisfy a predicate. def filter(f: T => Boolean):…

1.编写程序代码如下: Wordcount.scala package Wordcount import org.apache.spark.SparkConf import org.apache.spark.SparkContext import org.apache.spark.SparkContext._ /** * @author hadoop * 统计字符出现个数 * */ object Wordcount { def main(args: Array[String]) { if(arg…

1.首先需要搭建好hadoop+spark环境,并保证服务正常.本文以wordcount为例. 2.创建源文件,即输入源.hello.txt文件,内容如下: tom jerry henry jim suse lusy 注:以空格为分隔符 3.然后执行如下命令: hadoop fs -mkdir -p /Hadoop/Input(在HDFS创建目录) hadoop fs -put hello.txt /Hadoop/Input(将hello.txt文件上传到HDFS) hadoop fs -ls…

一.java版本 package cn.spark.study.streaming; import java.util.Arrays; import org.apache.spark.SparkConf; import org.apache.spark.api.java.function.FlatMapFunction; import org.apache.spark.api.java.function.Function2; import org.apache.spark.api.java.fu…

目录 通过scala语言基于local编写spark的Wordcount 基于yarn去调度WordCount 通过scala语言基于local编写spark的Wordcount import org.apache.spark.rdd.RDD import org.apache.spark.{SparkConf, SparkContext} object WordCount { def main(args: Array[String]): Unit = { // Spark配置文件对象 val…