LuciferYang commented on pull request #30483:
URL: https://github.com/apache/spark/pull/30483#issuecomment-895898471


   I have some problems now:
   1. How should we pass the filemeta to the Reader? Now I add a new API named 
`setCachedXXX()`
   2. Parquet no longer has non Deprecated API that can be used to pass footer 
to create new `ParquetFileReader`
   3. Should we add more configs related to eviction policy, such as 
maximumSize 
   4. Should scheduling sensitivity be considered at present?


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