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

    https://github.com/apache/spark/pull/16000#discussion_r89905857
  
    --- Diff: 
streaming/src/main/scala/org/apache/spark/streaming/ui/StreamingPage.scala ---
    @@ -145,6 +146,10 @@ private[ui] class StreamingPage(parent: StreamingTab)
       private val listener = parent.listener
       private val startTime = System.currentTimeMillis()
     
    +  parent.parent.attachHandler(
    +    StreamingApiRootResource.getServletHandler(parent.parent, listener, 
startTime)
    --- End diff --
    
    the main reason is to maintain the consistency of startTime between the 
original webUI and the api
    maybe it is better to record a start time from the start of streaming 
context or the listener itself
    but that will be a change in definition. 


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