Github user srowen commented on the issue:
https://github.com/apache/spark/pull/22993
@felixcheung the JVM flag would be something like `--add-opens
java.base/java.lang=ALL-UNNAMED`. Everything should still work without it, it's
just that this 'hack' no longer works to ignore `MaxDirectMemorySize`. That
default appears to be equal to the size of the JVM heap, which isn't small, so
also should work in many situations. For those apps that use a large amount of
direct memory, another alternative is to set `-XX:MaxDirectMemorySize=`
directly.
I don't know of a better solution right now, and that one's not bad, but I
will write up provisional release notes in the JIRA that explain this.
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