[jira] [Updated] (ROCKETMQ-94) Support different subscriptions for some newly release instance

["vongosling (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ROCKETMQ-94?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

vongosling updated ROCKETMQ-94:
-------------------------------
    Priority: Critical  (was: Major)

> Support different subscriptions for some newly release instance
> ---------------------------------------------------------------
>
>                 Key: ROCKETMQ-94
>                 URL: https://issues.apache.org/jira/browse/ROCKETMQ-94
>             Project: Apache RocketMQ
>          Issue Type: New Feature
>          Components: rocketmq-broker, rocketmq-client
>    Affects Versions: 4.0.0-incubating
>            Reporter: Jaskey Lam
>            Assignee: yukon
>            Priority: Critical
>
> RocketMQ 's consumer group has a restrict that all instances must have the same subcriptions.
> But when new version is release, the consumer's subcriptions may be added or removed, which will make all instances have different subcriptions.
> Say I have a app with 3 instances which subcribe topicA and topicB,which is working fine. 
> When I am going to release a newer version which need to subcrbe one more topicC, and when I deploy instance-1, this will break the rule since it is still the same consumer group.
> The same problem when I need a subcribe one more tag.
> This is a very common scenario which rocketmq should solve in a transparent way.



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