Flink运行wordcount——读写hdfs

本文介绍: Flink运行wordcount——读写hdfs

package com.test;

import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.util.Collector;

public class ReadHDFS {
    public static void main(String[] args) {
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        DataStream<String> text = env.readTextFile("hdfs://10.9.13.171:54310/testdir/abc.txt"); // your source here

        DataStream<Tuple2<String, Integer>> wordCounts = text.flatMap(new FlatMapFunction<String, Tuple2<String, Integer>>() {
            @Override
            public void flatMap(String value, Collector<Tuple2<String, Integer>> out) throws Exception {
                String[] words = value.toLowerCase().split("\s+");
                for (String word : words) {
                    if (!word.isEmpty()) {
                        out.collect(new Tuple2<>(word, 1));
                    }
                }
            }
        });

        wordCounts.print();
        wordCounts.writeAsText("hdfs://10.9.13.171:54310/testdir/wordcountoutput");

        try {
            env.execute("WordCount Job");
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

pom.xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>flink-test</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <flink.version>1.14.5</flink.version>
        <hadoop.version>3.1.2</hadoop.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-java</artifactId>
            <version>${flink.version}</version>
        </dependency>
        <!-- 其他依赖 -->
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-core</artifactId>
            <version>${flink.version}</version> <!-- 用您实际使用的Flink版本号替换 ${flink.version} -->
        </dependency>
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-streaming-java_2.12</artifactId>
            <version>${flink.version}</version> <!-- 用您实际使用的Flink版本号替换 ${flink.version} -->
        </dependency>
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-clients_2.12</artifactId>
            <version>${flink.version}</version> <!-- 用您实际使用的Flink版本号替换 ${flink.version} -->
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>${hadoop.version}</version> <!-- 用您实际使用的Hadoop版本号替换 ${hadoop.version} -->
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-hdfs</artifactId>
            <version>${hadoop.version}</version> <!-- 用您实际使用的Hadoop版本号替换 ${hadoop.version} -->
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <!-- 配置将依赖包一并打入到项目的 jar 包中 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>3.6.0</version>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>com.test.ReadHDFS</mainClass>
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id> <!-- this is used for inheritance merges -->
                        <phase>package</phase> <!-- 指定在打包节点执行jar包合并操作 -->
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

打包后提交到yarn集群命令

[root@node171 lib]# flink run -m yarn-cluster  flink-test-1.0-SNAPSHOT-jar-with-dependencies.jar

报错

原文地址:https://blog.csdn.net/Helen_1997_1997/article/details/134575612

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