Jackie-Jiang opened a new pull request, #9132:
URL: https://github.com/apache/pinot/pull/9132

   - Fix upsert replace to
     - Correctly replace record location without removing the valid docs from 
the replaced segment
     - Correctly track and remove the remaining valid docs from the replaced 
segment
     - Track replaced segment so that the docs do not need to be removed again
   - Use segment lock to prevent adding/replacing/removing the same segment at 
same time which can cause race condition
   - Track an unexpected case where the primary keys show up in the wrong 
segment using meter `UPSERT_KEYS_IN_WRONG_SEGMENT`


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