Github user rednaxelafx 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?
    
    ^^ Just making sure I understood the intent correctly and not the other way 
around. There may well be the other side of administrative needs which is to 
"force options", e.g. force `-XX:-DisableExplicitGC` so that NIO direct memory 
doesn't get into trouble, but that'd be out of scope of this PR.


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