huaxingao commented on issue #13867:
URL: https://github.com/apache/iceberg/issues/13867#issuecomment-3258872233

   > Is it possible that this might lead to duplicates like same file being 
referenced in multiple snapshots.
   
   No. Idempotent key prevents re-execution: on a retry with the same 
key+payload the server just returns the original result, so it can’t create a 
second snapshot or re-add files. If the payload changes (even if it would point 
at the same file), the hash differs and the server returns 422/409 per normal 
conflict rules.


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