Reamer opened a new pull request #3925:
URL: https://github.com/apache/zeppelin/pull/3925
### What is this PR for?
These PR touch the start and stop procedures of all interpreters.
- improved start script with [shellcheck](https://www.shellcheck.net/)
recommendations
- Use `exec [...]` instead of `eval [..] &`, which means that the Java
interpreter process is not a fork of the shell script
-> no trap handling required in the start script
-> signals land in the JVM
- remove anonymous threads in 'RemoteInterpreterServer.java and give the
thread nice names
- Use TServer's StopTimeoutVal and stopTimeoutUnit for faster shutdown
- remove special K8s shutdown handling
### What type of PR is it?
- Improvement
### Todos
* [ ] - Task
### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-5070
### How should this be tested?
* Travis-CI: https://travis-ci.org/github/Reamer/zeppelin/builds/730239380
### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No
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