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

    https://github.com/apache/spark/pull/3721#discussion_r22243660
  
    --- Diff: 
streaming/src/main/scala/org/apache/spark/streaming/receiver/ReceivedBlockHandler.scala
 ---
    @@ -169,10 +171,7 @@ private[streaming] class 
WriteAheadLogBasedBlockHandler(
         }
     
         // Combine the futures, wait for both to complete, and return the 
write ahead log segment
    -    val combinedFuture = for {
    --- End diff --
    
    Very good catch. I wasnt aware that `for-yield` is `flatMap` which is 
obviously ordered. 


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