ChenSammi commented on PR #3674:
URL: https://github.com/apache/ozone/pull/3674#issuecomment-1838121303

   @szetszwo , thanks for working on this. Do you have time to do a patch 
rebase? 
   
   I did a micro performance test, comparing the on heap buffer, off heap 
buffer and memory mapped buffer, here is the result.
   
![image](https://github.com/apache/ozone/assets/19790142/e59952a0-2e56-41be-af80-1fec3d103783)
   
   By default, DN will use 1MB(bytes.per.checksum) as the buffer size. So using 
memory mapped buffer can increase at least micro level performance a lot. 
   


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