hadoop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

yarn.application.classpath hadoop classpath返回信息

重启yarn

原文链接：https://blog.csdn.net/hongxiao2016/article/details/88919176