hadoop3.1.1：找不到或无法加载主类 org.apache.hadoop.mapreduce.v2.app.MRAppMaster

yarn执行MapReduce任务时，找不到主类导致的

解决：

1、在命令行输入：hadoop classpath

[hadoop@localhost ~]$ hadoop classpath

/data/hadoop/hadoop//etc/hadoop:/data/hadoop/hadoop//share/hadoop/common/lib/*:/data/hadoop/hadoop//share/hadoop/common/*:/data/hadoop/hadoop//share/hadoop/hdfs:/data/hadoop/hadoop//share/hadoop/hdfs/lib/*:/data/hadoop/hadoop//share/hadoop/hdfs/*:/data/hadoop/hadoop//share/hadoop/mapreduce/lib/*:/data/hadoop/hadoop//share/hadoop/mapreduce/*:/data/hadoop/hadoop//share/hadoop/yarn:/data/hadoop/hadoop//share/hadoop/yarn/lib/*:/data/hadoop/hadoop//share/hadoop/yarn/*

2、把上述输出的值添加到yarn-site.xml文件对应的属性 <name>yarn.application.classpath</name>下面，eg：

   <property>

         <name>yarn.application.classpath</name>

         <value>/data/hadoop/hadoop//etc/hadoop:/data/hadoop/hadoop//share/hadooo

p/common/lib/*:/data/hadoop/hadoop//share/hadoop/common/*:/data/hadoop/hadoop//ss

hare/hadoop/hdfs:/data/hadoop/hadoop//share/hadoop/hdfs/lib/*:/data/hadoop/hadooo

p//share/hadoop/hdfs/*:/data/hadoop/hadoop//share/hadoop/mapreduce/lib/*:/data/hh

adoop/hadoop//share/hadoop/mapreduce/*:/data/hadoop/hadoop//share/hadoop/yarn:/dd

ata/hadoop/hadoop//share/hadoop/yarn/lib/*:/data/hadoop/hadoop//share/hadoop/yarr

n/*</value>

   </property>

3、重启yarn，重新跑MapReduce任务。

巴特西

hadoop3.1.1：找不到或无法加载主类 org.apache.hadoop.mapreduce.v2.app.MRAppMaster

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