Github user cloverhearts commented on the issue:
https://github.com/apache/zeppelin/pull/2140
@jongyoul Tested.
Spark and Markdown and Misc interpreter (without shiro)
```
restart interpreter on web ui ----> restart feature well work.
zeppelin shutdown (daemon stop) ---> well working, I can't reproduce with
zombie process. :)
```
Thank you for good fix :)
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