Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/18320#discussion_r123564501
--- Diff: R/pkg/inst/worker/daemon.R ---
@@ -30,8 +30,40 @@ port <- as.integer(Sys.getenv("SPARKR_WORKER_PORT"))
inputCon <- socketConnection(
port = port, open = "rb", blocking = TRUE, timeout = connectionTimeout)
+# Waits indefinitely for a socket connecion by default.
+selectTimeout <- NULL
+
while (TRUE) {
- ready <- socketSelect(list(inputCon))
+ ready <- socketSelect(list(inputCon), timeout = selectTimeout)
--- End diff --
Its less of waiting indefinitely but its waiting for input from the JVM
socket -- I think this is the right behavior by design
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