JosephChanChan opened a new issue, #5235:
URL: https://github.com/apache/rocketmq/issues/5235

   There a problem when mapfile flush message to disk. 
   details see: https://github.com/apache/rocketmq/issues/3129
   
   The measures bellow:
   
   - message property: MessageConst.PROPERTY_WAIT_STORE_MSG_OK to true
   - broker config : flushDiskType=FlushDiskType.SYNC_FLUSH
   
   It can't ensure a message could be flush to disk. the flushedPosition would 
updated to writePosition even if a error was occurred. then return a PUT_OK 
result to producer in GroupCommitService.doCommit function
   
   <img width="1127" alt="image" 
src="https://user-images.githubusercontent.com/19208259/193216122-dd6d80dd-598e-4e16-ad2a-043b4985708c.png";>
   
   there some messages will be lost if power off now, and the producer has been 
received a ok response.
   
   


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