vvcephei commented on pull request #8079:
URL: https://github.com/apache/kafka/pull/8079#issuecomment-635380658


   Hi @IndeedSi ,
   
   No, as far as I know Jiri's solution was to increase the join window size. 
Judging from the investigation, it seemed like there really were out-of-order 
records in the repartition topic that needed to be buffered so they could be 
processed instead of dropped (as opposed to some kind of superfluous logging as 
we initially thought).
   
   Does you investigation point to the same cause? If so, then really the only 
thing that can be done is to increase the join window (aka buffer more 
records), so that you aren't dropping any data.
   
   I hope this helps,
   -John


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