Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18320#discussion_r122606765
--- Diff: R/pkg/inst/worker/daemon.R ---
@@ -47,8 +55,6 @@ while (TRUE) {
close(inputCon)
Sys.setenv(SPARKR_WORKER_PORT = port)
try(source(script))
- # Set SIGUSR1 so that child can exit
- tools::pskill(Sys.getpid(), tools::SIGUSR1)
parallel:::mcexit(0L)
--- End diff --
BTW, up to my knowledge, this should work alone, at least in C (< I didn't
test). Even if it was a bug in R and is fixed in the future, I guess the
current logics would still work with the current status.
```R
arbitrary <- 9999
tools::pskill(arbitrary, tools::SIGUSR1)
```
https://stat.ethz.ch/R-manual/R-devel/library/tools/html/pskill.html
> it silently ignores invalid values of its arguments, including zero or
negative pids.
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