Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/20645
> A quick question: after this change, extraJavaOptions is still able to
cleanly override whatever's set in defaultJavaOptions, is that right?
No, the intent is for both sets of options to be passed. How the JVM
interprets the options is not up to Spark. This is intended to provide a way
for administrators to default properties so they are not accidentally
overridden when a user adds `--driver-java-options`. Users can still override
`defaultJavaOptions` if they need to deviate from adminstrator defaults.
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