Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/17796#discussion_r113870571
--- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
@@ -916,7 +916,7 @@ private[spark] object Utils extends Logging {
def setCustomHostname(hostname: String) {
// DEBUG code
Utils.checkHost(hostname)
- customHostname = Some(hostname)
+ customHostname = Option(hostname)
--- End diff --
This should be OK, but, it's already being checked for null in the line
above.
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