Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/16596
right, i think we could either leave it as-is, or
- check for java like this PR was trying to do originally; or
- check that it resolved to an empty string in spark-submit, and echo an
error message - this won't solve the wait with R but it's better than nothing
for 1 minute
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