Why Kyuubi doesn't use [session user] as [proxy user] to execute statements at the server share level?

[theoryxu]

Hello guys

At the server share level, If I don't use the Ranger AuthZ Plugin, multiple users use the system user's credential, who submits the spark job, to access HDFS, rather than their owner credential. So on the HDFS side, all actions are executed as the system user, so the HDFS Ranger Plugin loses control.

I read Kyuubi's code And found the function setting appropriate configs for each session user. 👇
https://github.com/apache/kyuubi/blob/master/externals/kyuubi-spark-sql-engine/src/main/scala/org/apache/kyuubi/engine/spark/operation/SparkOperation.scala#L130

So why Kyuubi doesn't use [session user] as [proxy user] to execute statements at the server share level like this: 👇

Are there some lurking issues or concerns at the system level?

Looking forward to your opinions very much!