Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19630
Actually, R has a flag for `useDaemon`:
https://github.com/apache/spark/blob/478fbc866fbfdb4439788583281863ecea14e8af/core/src/main/scala/org/apache/spark/api/r/RRunner.scala#L362
It'd be great if we have this flag too. It makes easier to test Windows
specific issue too ..
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