divijvaidya opened a new pull request, #12917:
URL: https://github.com/apache/kafka/pull/12917

   https://github.com/apache/kafka/pull/12890 introduced the notion of 
calculating (and caching) the size for the request header during the first 
parse operation. This prevents re-calculation and hence, improves CPU usage for 
produce workload. 
   
   However, @showuon found a bug in calculation of size in that PR mentioned at 
https://github.com/apache/kafka/pull/12916
   
   This PR modifies the (incorrect!) approach we took earlier to calculate the 
header size and replaces it with another approach while still avoiding 
re-calculation of request header size.
   


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