Github user falaki commented on the issue:
https://github.com/apache/spark/pull/15471
Thanks @shivaram. I ran a real workload consisting of long running parallel
simulations that took about 3.5 hours. I also tested it by calling
`Sys.sleep()` inside workers with dapply and spark.lapply. Would be good to
torture it in new ways.
Also would be interesting to think about ways of unit-testing this.
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