Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/18320#discussion_r122687051 --- Diff: R/pkg/inst/worker/daemon.R --- @@ -31,7 +31,15 @@ inputCon <- socketConnection( port = port, open = "rb", blocking = TRUE, timeout = connectionTimeout) while (TRUE) { - ready <- socketSelect(list(inputCon)) + ready <- socketSelect(list(inputCon), timeout = 1) + + # Terminate R workers in the parent process. + finishedChildren <- parallel:::selectChildren() --- End diff -- @felixcheung, I tested with the change below: ```diff port <- as.integer(Sys.getenv("SPARKR_WORKER_PORT")) +Sys.sleep(5L) inputCon <- socketConnection( port = port, blocking = TRUE, open = "rb", timeout = connectionTimeout) outputCon <- socketConnection( ``` It looks fine. Does this deal with your concern?
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