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原因是mapred-site.xml配置文件少了内容

<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>


 

 

将上面内容复制到配置文件中,将${full path of your hadoop distribution directory}改成hadoop classpath 的完整路径,如上图

改完了以后

 

 

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