zhengruifeng commented on PR #58278:
URL: https://github.com/apache/spark/pull/58278#issuecomment-5420948896

   Hi @dongjoon-hyun, thank you for the detailed review. I addressed the 
comments and replied to each thread. The PR now uses a pre-sized 
`java.util.HashMap`, hoists the broadcast dereference outside the token loop, 
removes the sentinel/helper changes, and adds strict-Kryo registration 
coverage. I also added the lookup, heap, Java serialization, and Kryo 
comparison to the benchmark summary above. Could you please take another look 
when you have time?


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