Github user zsxwing commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16859#discussion_r100159293
  
    --- Diff: 
common/network-common/src/main/java/org/apache/spark/network/server/TransportChannelHandler.java
 ---
    @@ -48,7 +47,7 @@
      * on the channel for at least `requestTimeoutMs`. Note that this is 
duplex traffic; we will not
      * timeout if the client is continuously sending but getting no responses, 
for simplicity.
      */
    -public class TransportChannelHandler extends 
SimpleChannelInboundHandler<Message> {
    +public class TransportChannelHandler extends ChannelInboundHandlerAdapter {
    --- End diff --
    
    SimpleChannelInboundHandler also uses Javassist to generate a matcher 
class. Since `SimpleChannelInboundHandler` provides little value for us, I just 
changed to extend `ChannelInboundHandlerAdapter` directly.


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