Github user FRosner commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/844#issuecomment-212769849
Thanks for your comment, @felixcheung. If the parent communicates the
signal properly, it is not going to be a problem.
I tested it and it seemed to work:
```sh
frosner:nomad-zeppelin-spark/ (master*) $ nomad run zeppelin.nomad
==> Monitoring evaluation "c5396320"
Evaluation triggered by job "zeppelin-job"
Allocation "801ed0af" created: node "fae40394", group "zeppelin-group"
Allocation "f6618daf" created: node "fae40394", group
"spark-master-group"
Evaluation status changed: "pending" -> "complete"
==> Evaluation "c5396320" finished with status "complete"
```
```sh
frosner:incubator-zeppelin/ (ZEPPELIN-815) $ pstree | grep zeppelin
| | \--- 92143 frosner grep --color zeppelin
| |-+= 91991 root /usr/local/bin/nomad executor
/tmp/NomadClient406688203/801ed0af-ebd1-32e8-20c3-3b3142bf6980/zeppelin-task/zeppelin-task-executor.out
| | \-+- 91993 root /usr/bin/java -Dfile.encoding=UTF-8 -Xms1024m
-Xmx1024m -XX:MaxPermSize=512m
-Dzeppelin.log.file=/usr/local/zeppelin/logs/zeppelin--FAG-Book.local.log -cp
::/usr/local/zeppelin/lib/*:/usr/local/zeppelin/*::/usr/local/zeppelin/conf
org.apache.zeppelin.server.ZeppelinServer
| | \-+- 92109 root /bin/bash
/usr/local/zeppelin/bin/interpreter.sh -d /usr/local/zeppelin/interpreter/spark
-p 61507
| | \--- 92117 root /usr/bin/java -Dfile.encoding=UTF-8
-Dfile.encoding=UTF-8
-Dzeppelin.log.file=/usr/local/zeppelin/logs/zeppelin-interpreter-spark--FAG-Book.local.log
-Xms1024m -Xmx1024m -XX:MaxPermSize=512m -cp
::/usr/local/zeppelin/interpreter/spark/dep/*:/usr/local/zeppelin/interpreter/spark/*::/usr/local/zeppelin/conf:/usr/local/zeppelin/conf:/usr/local/zeppelin/lib/zeppelin-interpreter-0.5.6-incubating.jar
org.apache.zeppelin.interpreter.remote.RemoteInterpreterServer 61507
```
```sh
frosner:nomad-zeppelin-spark/ (master*) $ nomad stop zeppelin
==> Monitoring evaluation "383ba8c7"
Evaluation triggered by job "zeppelin-job"
Evaluation status changed: "pending" -> "complete"
==> Evaluation "383ba8c7" finished with status "complete"
```
```sh
frosner:incubator-zeppelin/ (ZEPPELIN-815) $ pstree | grep zeppelin
| | \--- 92163 frosner grep --color zeppelin
```
Probably because `interpreter.sh` (line 147) traps the signals and executes
the shutdown hook:
```sh
trap 'shutdown_hook;' SIGTERM SIGINT SIGQUIT
```
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