Simple way to meet your goal , you can add hadoop jars into project classpath.
I.e If you have hadoop package, extract it and add all the jars into project
classpath.
Then you change java code below
YarnConfiguration conf = new YarnConfiguration();
conf.set("yarn.resourcemanager.address", "rm-ip:port"); // Running RM
address
YarnClient yarnClient = YarnClient.createYarnClient();
yarnClient.init(conf);
yarnClient.start(); // you need to start YarnClient service
// code to getApplications()
}
Thanks & Regards
Rohith Sharma K S
From: Mouzzam Hussain [mailto:monibab...@gmail.com]
Sent: 26 February 2015 16:23
To: user@hadoop.apache.org
Subject: YarnClient to get the running applications list in java
I am working with YarnClient for the 1st time. My goal is to get and display
the applications running on Yarn using Java. My project setup is as follows:
public static void main(String[] args) throws IOException, YarnException {
// Create yarnClient
YarnConfiguration conf = new YarnConfiguration();
YarnClient yarnClient = YarnClient.createYarnClient();
yarnClient.init(conf);
try {
List applications = yarnClient.getApplications();
System.err.println("yarn client : " + applications.size());
} catch (YarnException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
I get the following exception when i run the program:
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoClassDefFoundError:
org/apache/hadoop/HadoopIllegalArgumentException
at projects.HelloWorld.main(HelloWorld.java:16)
... 6 more
Caused by: java.lang.ClassNotFoundException:
org.apache.hadoop.HadoopIllegalArgumentException
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
The POM file is as follows:
<?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>BigContent</groupId>
<artifactId>ManagementServer</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<hadoop.version>2.4.0</hadoop.version>
<spark.version>1.2.1</spark.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.3</version>
<executions>
<execution>
<!-- First step is to disable the default-war build
step. -->
<id>default-war</id>
<phase>none</phase>
</execution>
<execution>
<!-- Second step is to create an exploded war. Done in
prepare-package -->
<id>war-exploded</id>
<phase>prepare-package</phase>
<goals>
<goal>exploded</goal>
</goals>
</execution>
<execution>
<!-- Last step is to make sure that the war is built in
the package phase -->
<id>custom-war</id>
<phase>package</phase>
<goals>
<goal>war</goal>
</goals>
</execution>
</executions>
<configuration>
<webXml>src/main/webapp/WEB-INF/web.xml</webXml>
<webResources>
<resource>
<!-- this is relative to the pom.xml directory -->
<directory>resource2</directory>
</resource>
</webResources>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming_2.10</artifactId>
<version>${spark.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-core</artifactId>
<version>1.9.1</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>${hadoop.version}</version>
<exclusions>
<exclusion>
<groupId>javax.servlet</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-yarn-common</artifactId>
<version>${hadoop.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-common</artifactId>
<version>${hadoop.version}</version>
<scope>provided</scope>
<exclusions>
<exclusion>
<groupId>javax.servlet</groupId>
<artifactId>*</artifactId>
</exclusion>
<exclusion>
<groupId>com.google.guava</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-mapreduce-client-core</artifactId>
<version>${hadoop.version}</version>
</dependency>
<dependency>
<groupId>json-mapreduce</groupId>
<artifactId>json-mapreduce</artifactId>
<version>1.0-SNAPSHOT</version>
<exclusions>
<exclusion>
<groupId>javax.servlet</groupId>
<artifactId>*</artifactId>
</exclusion>
<exclusion>
<groupId>commons-io</groupId>
<artifactId>*</artifactId>
</exclusion>
<exclusion>
<groupId>commons-lang</groupId>
<artifactId>*</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-common</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-core</artifactId>
<version>0.20.2</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>16.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.7</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.0</version>
</dependency>
</dependencies>
</project>
Can you please help me in fixing the issue, or if you can suggest a better way?
Best Regards,
Mouzzam Hussain
