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How to set UserGroupInformation?


Hi all

I'm trying to write data to HDFS in directory "/home/hbase/XXX". Only "hbase" user can write to the directory.    
The problem is: I submit a job to yarn. The job will be a "yarn" user to write data, while "yarn" user is not allowed to write to  "/home/hbase/XXX".
Is there any method that I can set UserGroupInformation to "hbase"? 

Thanks!

Xinyu Zhang