Github user taroplus commented on the issue:
https://github.com/apache/spark/pull/17074
@holdenk
I believe this was introduced in this change
https://github.com/apache/spark/commit/fa0524fd02eedd0bbf1edc750dc3997a86ea25f5#diff-bb538fda94224dd0af01d0fd7e1b4ea0R39
the change is to stop passing 'parent' to the parent class(ClassLoader),
however this introduced a link between ExecutorClassLoader to SystemClassLoader.
Most of the time, SystemClassLoader is parent loader itself. Then it causes
issues with userClassPathFirst (SPARK-18646) and if it is not parent loader, it
causes issues like InvalidClassException(SPARK-19675)
I added a UT for this
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