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

    https://github.com/apache/spark/pull/11748#discussion_r56284643
  
    --- Diff: 
core/src/main/scala/org/apache/spark/scheduler/TaskResultGetter.scala ---
    @@ -81,8 +81,9 @@ private[spark] class TaskResultGetter(sparkEnv: SparkEnv, 
scheduler: TaskSchedul
                       taskSetManager, tid, TaskState.FINISHED, TaskResultLost)
                     return
                   }
    +              // TODO(josh): assumption that there is only one chunk here 
is a hack
                   val deserializedResult = 
serializer.get().deserialize[DirectTaskResult[_]](
    -                serializedTaskResult.get)
    +                serializedTaskResult.get.getChunks().head)
    --- End diff --
    
    This is a messy temporary hack caused by some interface mismatching; I'll 
see about fixing this so that we don't make any assumptions about there only 
being one chunk here.


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