hadoop执行mapreduce操作时报找不到或无法加载主类 org.apache.hadoop.mapreduce.v2.app.MRAppMaster的解决办法

hadoop执行mapreduce操作时报找不到或无法加载主类 org.apache.hadoop.mapreduce.v2.app.MRAppMaster的解决办法

1. 执行hadoop classpath，复制返回的结果

/opt/module/hadoop-3.3.3/etc/hadoop:/opt/module/hadoop-3.3.3/share/hadoop/common/lib/*:/opt/module/hadoop-3.3.3/share/hadoop/common/*:/opt/module/hadoop-3.3.3/share/hadoop/hdfs:/opt/module/hadoop-3.3.3/share/hadoop/hdfs/lib/*:/opt/module/hadoop-3.3.3/share/hadoop/hdfs/*:/opt/module/hadoop-3.3.3/share/hadoop/mapreduce/*:/opt/module/hadoop-3.3.3/share/hadoop/yarn:/opt/module/hadoop-3.3.3/share/hadoop/yarn/lib/*:/opt/module/hadoop-3.3.3/share/hadoop/yarn/*

3. 修改yarn-siet.xml文件，该文件在hadoop的安装目录/etc/hadoop 下
4. 在yarn-siet.xml文件的configuration中添加以下配置

<property>
	<name>yarn.application.classpath</name>
	<value>
		// 第一步的结果
	</value>
</property>

5. 问题顺利解决