dongjoon-hyun commented on issue #1083:
URL: https://github.com/apache/orc/issues/1083#issuecomment-1092540527

   Hi, @liangrui1988 . Please refer ORC spec in our official website.
   
   ![](https://orc.apache.org/img/OrcFileLayout.png)
   
   Here is the formula we use. It exists simply to match the underlying file 
system's block size historically. If you are using S3, your program will not 
read that part at all. So, there is no impact in the modern cloud infra.
   
   
https://github.com/apache/orc/blob/6b053d4ba4df036e2691f84331bd407354a7c3b2/java/tools/src/java/org/apache/orc/tools/FileDump.java#L771-L780


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