neoremind created SPARK-21703:

             Summary: Why RPC message are transferred with header and body 
separately in TCP frame
                 Key: SPARK-21703
             Project: Spark
          Issue Type: Question
          Components: Spark Core
    Affects Versions: 1.6.0
            Reporter: neoremind
            Priority: Trivial

After seeing the details of how spark leverage netty, I found one question, 
typically RPC message wire format would have a header+payload structure, and 
netty uses a TransportFrameDecoder to deal with how to determine a complete 
message from remote peer. But after using Wireshark sniffing tool, I found that 
the message are sent separately with header and then a body, although this 
works fine, but for underlying TCP there would be ACK segments sent back to 
acknowledge, there might be a little bit redundancy since we can sent them 
together and the header are usually very small. 

The main reason can be found in MessageWithHeader class, since transferTo 
method write tow times for header and body.

Could some one help me understand the background story on how to implement in 
such way?  Thanks!

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