Github user lins05 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15923#discussion_r89486838
  
    --- Diff: 
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala 
---
    @@ -108,6 +113,9 @@ final class ShuffleBlockFetcherIterator(
       /** Current number of requests in flight */
       private[this] var reqsInFlight = 0
     
    +  /** The blocks that can't be decompressed successfully */
    --- End diff --
    
    What about add more explanation, for example:
    
    ```java
     /** The blocks that can't be decompressed successfully. 
      ** It is used to guarantee that we retry at most once for those corrupted 
blocks. 
      **/
    ```


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