hudeqi commented on PR #13421:
URL: https://github.com/apache/kafka/pull/13421#issuecomment-1477340172

   > Why we need this PR if 
[KAFKA-9087](https://issues.apache.org/jira/browse/KAFKA-9087) had fixed the 
bug ( you mentioned in the jira)? Is there another potential bug? Or the bug 
fixed by [KAFKA-9087](https://issues.apache.org/jira/browse/KAFKA-9087) is not 
root cause?
   
   KAFKA-9087 solves the root cause of stopping fetch due to an "Offset 
mismatch" error thrown during "processPartitionData", but I thought about it, 
and there may be other potential exceptions here (although I haven't found it 
yet, it may be potential), It will also lead to the final result: the fetch 
stops and the log is not cleaned up, and finally the disk usage grows 
infinitely. To be more precise, this pr is a defensive measure, as I understand 
it.


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