Github user dongeforever commented on the issue:
https://github.com/apache/incubator-rocketmq/pull/53
@zhouxinyu yeah, this is a problem. When new client send batched messages
to old server, it will get no error, for the batched messages are treated as
normal message internally.
Maybe I need a new request code, therefore the old server cannot recognize
it and throw error.
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