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

    https://github.com/apache/spark/pull/1486#discussion_r17577914
  
    --- Diff: core/src/main/scala/org/apache/spark/scheduler/TaskLocation.scala 
---
    @@ -23,12 +23,33 @@ package org.apache.spark.scheduler
      * of preference will be executors on the same host if this is not 
possible.
      */
     private[spark]
    -class TaskLocation private (val host: String, val executorId: 
Option[String]) extends Serializable {
    -  override def toString: String = "TaskLocation(" + host + ", " + 
executorId + ")"
    +sealed abstract class TaskLocation(val host: String) {
    +}
    +
    +case class ExecutorCacheTaskLocation(override val host: String, val 
executorId: String)
    --- End diff --
    
    ok


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