Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/16596
That's what I have been thinking as well. We should probably investigate
why the absence of java doesn't result in an error immediately (1), and also
look into adding a timeout when we are launching the backend (might be tricker
on the R side?).
I do think having a fast, upfront check wouldn't hurt - but obviously
better if getting error back immediately (from (1)). I'll dig deeper, I
speculate this might be related to the use of `shell` on Windows.
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