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

    https://github.com/apache/flink/pull/2425#discussion_r84170399
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/NettyMessage.java
 ---
    @@ -112,9 +129,9 @@ public void write(ChannelHandlerContext ctx, Object 
msg, ChannelPromise promise)
     
                // Create the frame length decoder here as it depends on the 
encoder
                //
    -           // 
+------------------+------------------+--------++----------------+
    -           // | FRAME LENGTH (4) | MAGIC NUMBER (4) | ID (1) || CUSTOM 
MESSAGE |
    -           // 
+------------------+------------------+--------++----------------+
    +           // 
+------------------+------------------+------------+--------++----------------+
    +           // | FRAME LENGTH (4) | MAGIC NUMBER (4) | COOKIE (4) | ID (1) 
|| CUSTOM MESSAGE |
    +           // 
+------------------+------------------+------------+--------++----------------+
                static LengthFieldBasedFrameDecoder createFrameLengthDecoder() {
                        return new 
LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, -4, 4);
    --- End diff --
    
    We don't strip the cookie and hence there is no change to adjust the decoder


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