panzhi33 commented on issue #4011:
URL: https://github.com/apache/rocketmq/issues/4011#issuecomment-1074774549


   yes,the first 20 bytes unused.you can look at the code here, there is an 
invalidIndex, so it starts from 1
   
![image](https://user-images.githubusercontent.com/29321745/159417232-fd75c284-f07f-48d5-a495-75e694dbb6fd.png)
   


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