問題出現原因：
因為遠程提交hadoop的任務的情況下如果，沒有hadoop 的系統環境變量，就會讀取當前主機的用戶名，所以Hadoop集群的節點中沒有該用戶名的權限，所以出現的異常。
解決方法：
System.setProperty(“HADOOP_USER_NAME”,“hadoop2.7”);
Hadoop2.7是有hadoop集群節點權限的用戶
Hadoop報錯:org.apache.hadoop.security.AccessControlException: Permission denied: user=xxxx
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