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

    https://github.com/apache/spark/pull/15497#discussion_r83567889
  
    --- Diff: core/src/main/scala/org/apache/spark/util/ManualClock.scala ---
    @@ -27,6 +27,7 @@ package org.apache.spark.util
     private[spark] class ManualClock(private var time: Long) extends Clock {
     
       private var _isWaiting = false
    +  private var _readyForFirstPeek = false
    --- End diff --
    
    Can you add more docs on what does peek mean, what does this variable 
supposed to do?


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