yukon updated ROCKETMQ-106:
    Fix Version/s: 4.1.0-incubating

> Add flow control on topic level
> -------------------------------
>                 Key: ROCKETMQ-106
>                 URL: https://issues.apache.org/jira/browse/ROCKETMQ-106
>             Project: Apache RocketMQ
>          Issue Type: Wish
>          Components: rocketmq-client
>            Reporter: Jaskey Lam
>            Assignee: Jaskey Lam
>             Fix For: 4.1.0-incubating
> *Motivations*
> For current flow control, we can only control on queue level. 
> Howerver, the numbers of queue allocated may be dynamic changed. For example, 
> I might hope to control that at most 1000 messages can be pulled from broker 
> to protect my client. And I have no idea how many queue I am allocated. Maybe 
> I will have 5 queue and 5 instances so I set `pullThresholdForQueue`=1000, 
> which works as expected when one is fine. But as long as any instances 
> crashes, some instances may be allocated  more than one queue, which will 
> make messages pulled from broker exceed my expectations.
> A configuration of  `pullThresholdForTopic` is propably most user hopes.

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