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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