Hive错误：User root is not allowed to impersonate anonymous
修改hadoop 配置文件 etc/hadoop/core-site.xml，加入如下配置项：
<property>
<name>hadoop.proxyuser.root.hosts</name>
<value>*</value>
</property>
<property>
<name>hadoop.proxyuser.root.groups</name>
<value>*</value>
</property>
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