Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/2623#discussion_r18372768
--- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
@@ -1437,7 +1437,11 @@ private[spark] object Utils extends Logging {
val serviceString = if (serviceName.isEmpty) "" else s" '$serviceName'"
for (offset <- 0 to maxRetries) {
// Do not increment port if startPort is 0, which is treated as a
special port
- val tryPort = if (startPort == 0) startPort else (startPort +
offset) % 65536
+ val tryPort = if (startPort == 0) {
+ startPort
+ } else {
+ ((startPort + offset - 1024) % (65536 - 1024)) + 1024
--- End diff --
Can you add a comment here that says something like "If the new port wraps
around, do not try a privilege port"
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