[GitHub] spark pull request: [SPARK-2774] - Set preferred locations for red...

[rxin <gi...@git.apache.org>]

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

    https://github.com/apache/spark/pull/1697#discussion_r15675784
  
    --- Diff: core/src/main/scala/org/apache/spark/MapOutputTracker.scala ---
    @@ -284,6 +290,24 @@ private[spark] class MapOutputTrackerMaster(conf: SparkConf)
         cachedSerializedStatuses.contains(shuffleId) || mapStatuses.contains(shuffleId)
       }
     
    +  // Return the list of locations and blockSizes for each reducer.
    +  def getStatusByReducer(shuffleId: Int): Option[Map[Int, Array[(BlockManagerId, Long)]]] = {
    --- End diff --
    
    comment on the thread safety


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