错误原因:mapred-site.xml配置错误
错误详情:
<property>
<name>mapreduce.map.env</name>
<value>HADOOP_MAPRED_HOME=/urs/local/hadoop</value>
</property>
订正后:
<property>
<name>mapreduce.map.env</name>
<value>HADOOP_MAPRED_HOME=/usr/local/hadoop</value>
</property>