tarun11Mavani commented on issue #13494:
URL: https://github.com/apache/pinot/issues/13494#issuecomment-2252100429

   As part of this analysis, I discovered that when we update the schema or the 
index on an upsert-realtime table and then use the reload segments API to 
reload all segments, it doesn't update the CRC of the existing segments. The 
CRC is stored in `creation.meta` and is not updated when server reload happens. 
I verified this by monitoring the `creation.meta` file and also compared the 
segment metadata from server and zookeeper before and after the segment reload.
   This behavior ensures that schema and index changes do not adversely affect 
the Upsert Compaction task, maintaining seamless compaction of older segments.


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