ShivsundarR opened a new pull request, #20924:
URL: https://github.com/apache/kafka/pull/20924

   *What*
   
   - Currently we are passing down the same map in ShareAcknowledgementEvent to 
the application thread for callback processing. But this map could be modified 
in the ShareConsumeRequestManager, and could result in inconsistent data.
   - This was a bug in 
https://github.com/apache/kafka/commit/403f6c1caa4aa63c14c8da32ad98eff3a58d5853#diff-918e750d3f1c79f14a8489b1b56b95a07528755cd4303b525eb6da13217447df
 when `ShareAcknowledgementEvent` was introduced.
   - This PR uses a separate map every time an event is created.


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