Github user jaceklaskowski commented on a diff in the pull request:
https://github.com/apache/spark/pull/11615#discussion_r55868740
--- Diff: core/src/main/scala/org/apache/spark/ui/JettyUtils.scala ---
@@ -270,9 +270,25 @@ private[spark] object JettyUtils extends Logging {
gzipHandlers.foreach(collection.addHandler)
connectors.foreach(_.setHost(hostName))
+ // As each acceptor and each selector will use one thread, the
number of threads should at
+ // least be the number of acceptors and selectors plus 1. (See
SPARK-13776)
+ var minThreads = 1
+ connectors.foreach { c =>
--- End diff --
Use `collect` or "cast" using pattern matching on type.
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