liupc commented on a change in pull request #23438: [SPARK-26525][SHUFFLE]Fast 
release ShuffleBlockFetcherIterator on completion of the iteration
URL: https://github.com/apache/spark/pull/23438#discussion_r252153005
 
 

 ##########
 File path: 
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
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 @@ -160,6 +160,9 @@ final class ShuffleBlockFetcherIterator(
   @GuardedBy("this")
   private[this] val shuffleFilesSet = mutable.HashSet[DownloadFile]()
 
+  private[this] val onCompleteCallback: ShuffleFetchCompletionListener =
 
 Review comment:
   Done! thanks!

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