ShivsundarR opened a new pull request, #20752:
URL: https://github.com/apache/kafka/pull/20752

   *What*
   https://issues.apache.org/jira/browse/KAFKA-19789
   
   - There were some scenarios where `ShareFetchResponse` contained duplicate 
acquired records, this was a broker side bug.
   - Although ideally this should not happen, the client was not expecting this 
case and acknowledged with `GAP` type for any duplicate occurrence.
   - This case should be logged as an error in the client, and we must not 
acknowledge the duplicate offsets as the broker is already in a bad state.
   - PR adds an error log for this case and a unit test for the same.


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