Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/16596
We certainly could - since we never had this before, my thought was to
constraint this to only the point where we are installing on presumably a new
machine.
If we have it in `launchBackend` we would be doing that check every time?
But I wasn't completely sure if there was any other way spark-submit could have
run before where `java` was not in path or JAVA_HOME (sym lnk in current
directory??)
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