好程序员大数据

好程序员大数据培训教程分享Master的jps

2019-08-19  本文已影响0人  ab6973df9221

好程序员大数据培训教程分享Master的jps,SparkSubmit 

  类启动后的服务进程,用于提交任务,

  哪一段启动提交任务,哪一段启动submit(Driver端)

提交任务流程

1.Driver端提交任务到Master(启动sparkSubmit进程)

2.Master生成任务信息,放入对列中

3.Master通知Worker启动Executor,(Master过滤出存活的Worker,将任务分配给空闲资源多的worker)

4.worker的Executor向Driver端注册(只有executor真正参与计算) -> worker从Dirver端拿信息

5.Driver端启动Executor将任务划分阶段,分成小的task,再广播给相应的Worker让他去执行

6.worker会将执行完的任务回传给Driver

range 相当于集合子类

scala> 1.to(10)

res0: scala.collection.immutable.Range.Inclusive = Range(1, 2, 3, 4, 5, 6, 7, 8,

 9, 10)

scala> 1 to 10

res1: scala.collection.immutable.Range.Inclusive = Range(1, 2, 3, 4, 5, 6, 7, 8,

 9, 10)

提交任务到集群的任务类 :

Spark contextavailable as sc

SQL context available as sqlContext

直接调用:

spark WordCount

构建模板代码:

SparkConf:构建配置信息类,该配置优先于集群配置文件

setAppName:指定应用程序名称,如果不指定,会自动生成一个类似于uuid产生的名称

setMaster:指定运行模式:local-用1个线程模拟集群运行,

local[2]: 用2个线程模拟集群运行,loca[*]-当前有多少空闲到的线程就用多少线程来运行该任务

/**

  * 用spark实现单词计数

  */

object SparkWordCount {

  def main(args: Array[String]): Unit = {

    /**

      * 构建模板代码

      */

    val conf: SparkConf = new SparkConf()

      .setAppName("SparkWordCount")

//      .setMaster("local[2]")

    // 创建提交任务到集群的入口类(上下文对象)

    val sc: SparkContext = new SparkContext(conf)

    // 获取HDFS的数据

    val lines: RDD[String] = sc.textFile(args(0))

    // 切分数据,生成一个个单词

    val words: RDD[String] = lines.flatMap(_.split(" "))

    // 把单词生成一个个元组

    val tuples: RDD[(String, Int)] = words.map((_, 1))

    // 进行聚合操作

//    tuples.reduceByKey((x, y) => x + y)

    val sumed: RDD[(String, Int)] = tuples.reduceByKey(_+_)

    // 以单词出现的次数进行降序排序

    val sorted: RDD[(String, Int)] = sumed.sortBy(_._2, false)

    // 打印到控制台

//    println(sorted.collect.toBuffer)

//    sorted.foreach(x => println(x))

//    sorted.foreach(println)

    // 把结果存储到HDFS

    sorted.saveAsTextFile(args(1))

    // 释放资源

    sc.stop()

  }

}

打包后上传Linux

1.首先启动zookeeper,hdfs和Spark集群

启动hdfs

/usr/local/hadoop-2.6.1/sbin/start-dfs.sh

启动spark

/usr/local/spark-1.6.1-bin-hadoop2.6/sbin/start-all.sh

2.使用spark-submit命令提交Spark应用(注意参数的顺序)

/usr/local/spark-1.6.1-bin-hadoop2.6/bin/spark-submit \

--class com.qf.spark.WordCount \

--master spark://node01:7077 \

--executor-memory 2G \

--total-executor-cores 4 \

/root/spark-mvn-1.0-SNAPSHOT.jar \

hdfs://node01:9000/words.txt \

hdfs://node01:9000/out

3.查看程序执行结果

hdfs dfs -cat hdfs://node01:9000/out/part-00000

javaSparkWC

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.apache.spark.api.java.function.Function2;

import org.apache.spark.api.java.function.PairFunction;

import scala.Tuple2;

import java.util.Arrays;

import java.util.List;

public class JavaSparkWC {

    public static void main(String[] args) {

        SparkConf conf = new SparkConf()

                .setAppName("JavaSparkWC").setMaster("local[1]");

//提交任务入口类

        JavaSparkContext jsc = new JavaSparkContext(conf);

        //获取数据

        JavaRDD<String> lines = jsc.textFile("hdfs://hadoop01:9000/wordcount/input/a.txt");

        //切分数据

        JavaRDD<String> words =

lines.flatMap(new FlatMapFunction<String, String>() {

            @Override

            public Iterable<String> call(String s) throws Exception {

                List<String> splited = Arrays.asList(s.split(" ")); //生成list

                return splited;

            }

        });

        //生成元祖                               //一对一组 ,(输入单词,输出单词,输出1)

        JavaPairRDD<String, Integer> tuples =

words.mapToPair(new PairFunction<String, String, Integer>() {

            @Override

            public Tuple2<String, Integer> call(String s) throws Exception {

                return new Tuple2<String, Integer>(s, 1);

            }

        });

        //聚合                                                  //2个相同key的value,聚合

        JavaPairRDD<String, Integer> sumed =

tuples.reduceByKey(new Function2<Integer, Integer, Integer>() {

            @Override

            public Integer call(Integer v1, Integer v2) throws Exception {

                return v1 + v2;

            }

        });

        //此前key为String类型,没有办法排序

        //Java api并没有提供sortBy算子,此时需要把两个值位置调换,排序完成后,在换回来

        final JavaPairRDD<Integer, String> swaped =

sumed.mapToPair(new PairFunction<Tuple2<String, Integer>, Integer, String>() {

            @Override

            public Tuple2<Integer, String> call(Tuple2<String, Integer> tup) throws Exception {

//                return new Tuple2<Integer, String>(tup._2, tup._1);

                return tup.swap(); //swap(),交换方法

            }

        });

        //降序排序

        JavaPairRDD<Integer, String> sorted = swaped.sortByKey(false);

        //再次交换

        JavaPairRDD<String, Integer> res = sorted.mapToPair(

            new PairFunction<Tuple2<Integer, String>, String, Integer>() {

               @Override

               public Tuple2<String, Integer> call(Tuple2<Integer, String> tup)throws Exception {

                    return tup.swap();

               }

        });

        System.out.println(res.collect());

        jsc.stop();//释放资源

    }

}

好程序员大数据培训官网:http://www.goodprogrammer.org/

上一篇下一篇

猜你喜欢

热点阅读