attilapiros commented on a change in pull request #24245: 
[SPARK-13704][CORE][YARN] Reduce rack resolution time
URL: https://github.com/apache/spark/pull/24245#discussion_r270803352
 
 

 ##########
 File path: 
core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala
 ##########
 @@ -833,7 +840,20 @@ private[spark] class TaskSchedulerImpl(
   }
 
   // By default, rack is unknown
-  def getRackForHost(value: String): Option[String] = None
+  def getRackForHost(hosts: String): Option[String] = {
 
 Review comment:
   Nit: rename hosts to host

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