Could not find .apache.hadoop.mapreduce.v2.app.MRAppMaster

Hadoop3.14  .Error: Could not find or load main class org.apache.hadoop.mapreduce.v2.app.MRAppMaster

异常信息：

[2021-05-28 22:08:16.989]Container exited with a non-zero exit code 1. Error file: prelaunch.err.
Last 4096 bytes of prelaunch.err :
Last 4096 bytes of stderr :
Error: Could not find or load main class org.apache.hadoop.mapreduce.v2.app.MRAppMaster

Please check whether your etc/hadoop/mapred-site.xml contains the below configuration:
<property>
  <name>yarn.app.mapreduce.am.env</name>
  <value>HADOOP_MAPRED_HOME=${
    
    full path of your hadoop distribution directory}</value>
</property>
<property>
  <name>mapreduce.map.env</name>
  <value>HADOOP_MAPRED_HOME=${
    
    full path of your hadoop distribution directory}</value>
</property>
<property>
  <name>mapreduce.reduce.env</name>
  <value>HADOOP_MAPRED_HOME=${
    
    full path of your hadoop distribution directory}</value>
</property>

解决方式
首先执行
···
hadoop classpath
···
在yarn-site.yml中添加一下内容
hadoop103 部署了resourcemanager
hadoop104 nodemanager

    <property>
        <name>yarn.application.classpath</name>
        <value>将执行结果复制此处</value> 
    </property>

    <property>
        <name>yarn.resourcemanager.webapp.address.rm1</name>
        <value>hadoop103</value>
    </property>
    <property>
        <name>yarn.resourcemanager.scheduler.address.rm2</name>
        <value>hadoop104</value>
    </property>
    <property>
        <name>yarn.resourcemanager.webapp.address.rm2</name>
        <value>hadoop104</value>
    </property>