Github user rdblue commented on the issue:
    > 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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