Xun

For security, YARN uses the yarn user group to execute `/etc/yarn/sbin/Linux-amd64-64/container-executor`, which requires special settings for the `container-executor` file. 1. Running zeppelin with root can switch users, But this is...

@zjffdu , I submit a PR in your branch( https://github.com/zjffdu/zeppelin/pull/6 ), Add one to the Zeppelin plugin User-impersonation native module, Can be compiled when zeppelin, Compile this module with the...

@zjffdu , [CI pass](https://travis-ci.org/liuxunorg/zeppelin/builds/523999069), Please help me review code, thanks!

@zjffdu , I attach a [Zeppelin On Yarn Design Document](https://docs.google.com/document/d/1WsNNw_eF8zwapsbvmRlJmu5lTBQ9epOw-MI6g7ay84E/edit?usp=sharing) to the [ZEPPELIN-4050](https://issues.apache.org/jira/browse/ZEPPELIN-4050).

@zjffdu, @felixcheung , @jongyoul , Please help me review the code, Thanks!

This bug, It's not easy to get through the code review to understand the situation. Better way, It is verified by testing.

### No need to click the second time to execute successfully. Restore the interpreter process immediately 

CI Pass https://travis-ci.org/liuxunorg/zeppelin/builds/512089147 @zjffdu , @felixcheung , Please help me review code. In the second commit, I adjusted the way to recreate the invalid remote interpreter process. It is now...

Can anyone help me review the code, Thank you!

Not that, Because java can't get the actual physical memory usage of the server correctly. So now change it, Created on the server with the least number of interpreter processes....