turboFei commented on PR #3030:
URL: https://github.com/apache/parquet-java/pull/3030#issuecomment-2405671050

   This is the testing 3years ago on Spark-2.3.
   
   <img width="815" alt="image" 
src="https://github.com/user-attachments/assets/2f426e33-c47d-4224-91cb-89080a7dd8b1";>
   It reduces 3/2  hdfs RPC requests to namenode.
   
   And after this Spark patch in community 
[https://github.com/apache/spark/pull/39950]([SPARK-42388][SQL] Avoid parquet 
footer reads twice in vectorized reader),  the solution might reduce 1/2 hdfs 
RPC requests.


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