Github user JoshRosen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/2944#discussion_r19764605
  
    --- Diff: core/src/main/scala/org/apache/spark/ui/exec/ExecutorsTab.scala 
---
    @@ -27,8 +27,13 @@ import org.apache.spark.ui.{SparkUI, SparkUITab}
     
     private[ui] class ExecutorsTab(parent: SparkUI) extends SparkUITab(parent, 
"executors") {
       val listener = parent.executorsListener
    +  val threadDumpEnabled = 
parent.conf.getBoolean("spark.ui.threadDumpsEnabled", true)
    --- End diff --
    
    I originally added this when we had automatic executor -> driver periodic 
thread dumps.  I guess we don't need it anymore, unless you think it would be 
useful to have as a sort of "access control" feature.


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