问题出现原因：
因为远程提交hadoop的任务的情况下如果，没有hadoop 的系统环境变量，就会读取当前主机的用户名，所以Hadoop集群的节点中没有该用户名的权限，所以出现的异常。
解决方法：
System.setProperty(“HADOOP_USER_NAME”,“hadoop2.7”);
Hadoop2.7是有hadoop集群节点权限的用户
Hadoop报错:org.apache.hadoop.security.AccessControlException: Permission denied: user=xxxx
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