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

[55865835]

Hi:When I compile the sample cube, there are always errors??


Exit code: 1

[2021-07-06 19:55:24.646]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&gt;
<name&gt;yarn.app.mapreduce.am.env</name&gt;
<value&gt;HADOOP_MAPRED_HOME=${full path of your hadoop distribution 
directory}</value&gt;



but it's ok to execute mapreduct task alone??I've tried to configure the hadoop 
classpath, but it doesn't work. Have you ever met this situation?Look forward 
to your reply??