Alibaba-HZY opened a new pull request, #3445:
URL: https://github.com/apache/celeborn/pull/3445

   What changes were proposed in this pull request?
   Reuse FileChannel/FSDataInputStream in PartitionDataReader to avoid  open 
too many files
   
   Why are the changes needed?
   In previous implementations, different PartitionDataReader reused the same 
FileChannel/FSDataInputStream,but in #3349 
   changed this logic, so we need to maintain logical consistency
   Does this PR introduce any user-facing change?
   No.
   
   How was this patch tested?
   Manual test.


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