runzhiwang commented on pull request #299:
URL: https://github.com/apache/incubator-ratis/pull/299#issuecomment-734020368


   @szetszwo Thanks the great work, the improvement is awesome.  Now transferTo 
only work on client, but it did not work on primary.  
   
   1. when primary store data to disk, the flow is: socket -> kernel space -> 
user space (DirectByteBuffer) -> kernel space -> disk
   2. when primary send data to peer, the flow is: socket -> kernel space -> 
user space (DirectByteBuffer same to the previous) -> kernel space -> socket.  
   
   And I think the ideal flow as follows, but I'm not sure whether can we 
achieve it.
   
   1. when primary store data to disk, the flow is: socket -> kernel space -> 
disk
   2. when primary send data to peer, the flow is: socket (or disk) -> kernel 
space -> socket
   


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