Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18465
@felixcheung, it looks the codes below:
```R
for(i in 0:10000) {
p <- parallel:::mcfork()
if (inherits(p, "masterProcess")) {
stop("unexpected failure")
}
children <- suppressWarnings(parallel:::selectChildren(timeout = 0))
if (is.integer(children)) {
lapply(children, function(child) {
print(parallel:::readChild(child))
tools::pskill(child, tools::SIGUSR1)
})
}
}
```
works fine. Sounds `parallel:::selectChildren` sometimes prints warnings
such as "Bad file descriptor" and looks _few_ pipes are left open but it still
does not at least die.
I also resembled the original way -
```R
for(i in 0:10000) {
p <- parallel:::mcfork()
if (inherits(p, "masterProcess")) {
tools::pskill(child, tools::SIGUSR1)
stop("unexpected failure")
}
children <- parallel:::selectChildren(timeout = 0)
if (is.integer(children)) {
lapply(children, function(child) {
print(parallel:::readChild(child))
})
}
}
```
In my local, this gets easily dead.
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