Could not find or load main class org.apache.hadoop.mapred.YarnChild问题
我用的是Hadoop3.1.3版本，解决方法：在yarn-site.xml中添加如下代码，即可解决
<property>
<name>yarn.application.classpath</name>
<value>
/opt/module/hadoop-3.1.3/etc/hadoop,
/opt/module/hadoop-3.1.3/share/hadoop/common/*,
/opt/module/hadoop-3.1.3/share/hadoop/common/lib/*,
/opt/module/hadoop-3.1.3/share/hadoop/hdfs/*,
/opt/module/hadoop-3.1.3/share/hadoop/hdfs/lib/*,
/opt/module/hadoop-3.1.3/share/hadoop/mapreduce/*,
/opt/module/hadoop-3.1.3/share/hadoop/mapreduce/lib/*,
/opt/module/hadoop-3.1.3/share/hadoop/yarn/*,
/opt/module/hadoop-3.1.3/share/hadoop/yarn/lib/*
</value>
</property>
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