Reamer opened a new pull request, #4505:
URL: https://github.com/apache/zeppelin/pull/4505
### What is this PR for?
This PR polishes the cluster code.
### What type of PR is it?
- Refactoring
### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-5845
### How should this be tested?
* CI
### Questions:
* Does the licenses files need to update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No
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