Github user shaneknapp commented on the issue:
https://github.com/apache/spark/pull/22854
`mvn clean package` script logic worked!
```
[INFO]
------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO]
------------------------------------------------------------------------
[INFO] Total time: 15:11 min
[INFO] Finished at: 2018-10-26T10:01:13-07:00
[INFO]
------------------------------------------------------------------------
+ MVN_RETCODE=0
+
/home/jenkins/workspace/sknapp-testing-spark-branch-2.4-test-maven-hadoop-2.7/build/zinc-0.3.15/bin/zinc
-shutdown -port 3087
+ exit 0 <-------------- this is from "exit $MVN_RETCODE"
+ retcode1=0
```
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