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

    https://github.com/apache/spark/pull/2922#discussion_r19340941
  
    --- Diff: core/src/main/scala/org/apache/spark/broadcast/Broadcast.scala ---
    @@ -60,6 +62,8 @@ abstract class Broadcast[T: ClassTag](val id: Long) 
extends Serializable {
        */
       @volatile private var _isValid = true
     
    +  private var _destroySite = ""
    --- End diff --
    
    How useful is it to store this? it only helps in case of an invalid 
`Broadcast` instance. (PS you can use string interpolation instead of `format` 
in these changes if you care to)


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