Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18465
For race condition concern, I tested this as below:
```
vi tmp.R
```
copied and pasted:
```r
kill <- function(children) {
lapply(children, function(child) {
pid <- parallel:::readChild(child)
if (is.integer(pid)) {
if (child == pid) {
print(paste("child PID:", child, "and read PID:", pid))
tools::pskill(child, tools::SIGUSR1)
} else {
print(paste("child PID:", child, "and read PID:", pid, "not
killing"))
}
} else {
print(paste("child PID:", child, "and sent data:", unserialize(pid)))
}
})
}
for(i in 0:10000) {
p <- parallel:::mcfork()
if (inherits(p, "masterProcess")) {
# Send no data
parallel:::mcexit(0L)
} else {
p <- parallel:::mcfork()
if (inherits(p, "masterProcess")) {
# Send custom data
parallel:::sendMaster("arbitrary")
parallel:::sendMaster(123)
parallel:::mcexit(0L)
}
}
c <- parallel:::selectChildren(timeout = 0)
if (is.integer(c)) {
invisible(kill(c))
}
}
```
and ran:
```
Rscript tmp.R
```
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