Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/2410
Yeah, I mean Server broadcasts a message to all clients only after it
receive message from client. It looks like Method `channelRead0` is invoked
after it get message from client. There's no api to call this method directly.
https://github.com/netty/netty/blob/4.0/example/src/main/java/io/netty/example/securechat/SecureChatServerHandler.java#L58
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