[ISSUE-1316]Enhance share netty handler #635
What is the purpose of the change
According to the network topology of RocketMQ, it’s possible that a broker has hundreds of (even thousands of) netty channels established with members (especially consumers). If each stateless handler can be shared by all of these channels, memory should be saved slightly.
Verifying this change
It functions well and passed all the unit tests after this change.
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