Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/20404
For perfectness, I think we should hold a lock with JVM instance but I
wonder if it's easily possible. I roughly knew this but I think underestimated
this because I believe that will quite unlikely happens. I think reverting
https://github.com/apache/spark/commit/cc4b8510c1445fb742c0d750958d352adfa84902
doesn't fully resolve the issue because I think the same thing can also happen
between `if` and the next line.
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