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

    https://github.com/apache/spark/pull/19369#discussion_r141672528
  
    --- Diff: core/src/main/scala/org/apache/spark/storage/DiskStore.scala ---
    @@ -67,7 +67,7 @@ private[spark] class DiskStore(
         var threwException: Boolean = true
         try {
           writeFunc(out)
    -      blockSizes.put(blockId.name, out.getCount)
    +      blockSizes.put(blockId, out.getCount)
    --- End diff --
    
    This is in line with the other part of the PR: `name` allocates a 
String/StringBuilder. Why use it as a hash key and pay the price of unnecessary 
allocation, when `BlockId` is hashable?


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