错误: 找不到或无法加载主类 org.apache.hadoop.mapreduce.v2.app.MRAppMaster

错误信息: 

Container exited with a non-zero exit code 1. Error file: prelaunch.err.
Last 4096 bytes of prelaunch.err :
Last 4096 bytes of stderr :
错误: 找不到或无法加载主类 org.apache.hadoop.mapreduce.v2.app.MRAppMaster

 

解决方法:

在主机中运行:hadoop classpath

记下返回的结果

vi $HADOOP_HOME/etc/hadoop/yarn-site.xml

添加一个配置

<property>
        <name>yarn.application.classpath</name>
        <value>hadoop classpath返回信息</value>
</property>

重启yarn