Github user djvulee commented on the issue:
https://github.com/apache/spark/pull/16210
I find the reason, because we pass some SPARK_SUBMIT_OPTS defined by
ourself, so it seem that spark only parse the opts defined by ourself, ignore
the ```-Dscala.usejavacp=true```.
Since we want user to use the `SPARK_SUBMIT_OPTS`, the best way it to
separate the ```-Dscala.usejavacp=true``` from the SPARK_SUBMIT_OPTS, maybe
move to SparkSubmitCommandBuilder is good idea as suggestioned by @vanzin.
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