Github user khalidhuseynov commented on the issue:
https://github.com/apache/zeppelin/pull/1566
So I've done some research and `--proxy-user` argument is used with either
`spark-submit` or `spark-shell` normally, and each of them creates new spark
context. The problem is that Zeppelin calls `spark-submit` only once in
`shared` and `scoped` modes when initializing interpreter, and afterwards
single spark context is used. Thus it makes having impersonation through
`--proxy-user` on spark interpreter in `shared` and `scoped` mode
*complicated*. For isolated mode, it's easier since we can pass user with
SparkConf for each spark context on initialization. any suggestions /opinions
are welcome.
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