Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/2858
And reading the code snippet below, I don't see any senacairo we need to
have 2 methods in `setStatus` of Job.java. Most of the implementation just left
`beforeStatusChange` empty.
https://github.com/apache/zeppelin/blob/master/zeppelin-interpreter/src/main/java/org/apache/zeppelin/scheduler/Job.java#L156---
