YarnClientHelloWorld

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>com.zpb.test</groupId>
    <artifactId>yarn-learn</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-yarn-client -->
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-yarn-client</artifactId>
            <version>2.7.3.2.6.5.0-292</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-client -->
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>2.7.3.2.6.5.0-292</version>
        </dependency>
    </dependencies>

    <!--maven 源加速-->
    <repositories>
        <repository>
            <id>nexus-aliyun</id>
            <name>Nexus aliyun</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
        </repository>
        <repository>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
            <id>hortonworks.extrepo</id>
            <name>Hortonworks HDP</name>
            <url>http://repo.hortonworks.com/content/repositories/releases</url>
        </repository>

        <repository>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
            <id>hortonworks.other</id>
            <name>Hortonworks Other Dependencies</name>
            <url>http://repo.hortonworks.com/content/groups/public</url>
        </repository>
    </repositories>

    <!--maven插件源加速-->
    <pluginRepositories>
        <pluginRepository>
            <id>nexus-aliyun</id>
            <name>Nexus aliyun</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
        </pluginRepository>
        <pluginRepository>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
            <id>hortonworks.extrepo</id>
            <name>Hortonworks HDP</name>
            <url>http://repo.hortonworks.com/content/repositories/releases</url>
        </pluginRepository>

        <pluginRepository>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
            <id>hortonworks.other</id>
            <name>Hortonworks Other Dependencies</name>
            <url>http://repo.hortonworks.com/content/groups/public</url>
        </pluginRepository>
    </pluginRepositories>
</project>

代码示例：

package com.zpb.learn;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.yarn.api.records.*;
import org.apache.hadoop.yarn.client.api.YarnClient;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.YarnException;

import java.io.IOException;
import java.util.EnumSet;
import java.util.List;

public class YarnHelloWorld {

    public static void main(String[] args){
        Configuration conf = new YarnConfiguration();
        YarnClient yarnClient = YarnClient.createYarnClient();
        yarnClient.init(conf);
        yarnClient.start();
        try {
            List<ApplicationReport> applications = yarnClient.getApplications(EnumSet.of(YarnApplicationState.RUNNING, YarnApplicationState.FINISHED));
            for (int i = 0; i < applications.size(); i++) {
                System.out.println("\nApplicationId ============> "+applications.get(i).getApplicationId());
                System.out.println("name ============> "+applications.get(i).getName());
                System.out.println("queue ============> "+applications.get(i).getQueue());
                System.out.println("user ============> "+applications.get(i).getUser());
                System.out.println("user ============> "+applications.get(i).getApplicationType());
            }
        } catch (YarnException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        yarnClient.stop();
    }
}

注：一定要将yarn-site.xml文件放至resources目录下，如图：

直接运行即可输出。