rajagopr opened a new pull request, #15428:
URL: https://github.com/apache/pinot/pull/15428

   ## Problem
   Initializing all the record readers within the task executor carries the 
risk of minion running into OOM issues.
   
   
   ## Solution
   The changes are to init the record readers lazily from the SegmentMapper and 
the mapper would take care of initializing and closing the record reader.
   
   ## Testing
   Covered by existing integration tests.
   


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