[jira] [Created] (ROCKETMQ-214) Improvement to help client to switch balance strategy

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

Jaskey Lam created ROCKETMQ-214:
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             Summary: Improvement to help client to switch balance strategy 
                 Key: ROCKETMQ-214
                 URL: https://issues.apache.org/jira/browse/ROCKETMQ-214
             Project: Apache RocketMQ
          Issue Type: Improvement
          Components: rocketmq-client
            Reporter: Jaskey Lam
            Assignee: Xiaorui Wang


In current implementations, rocketmq consumer will allocate message queue in client itself by fetching all clientid and all mq.

While when user hopes to switch balance strategy,  some problem will be suffered in the intermediate state before all client instance have been change to the same new strategy.

Say there are there clients with Strategy `AllocateMessageQueueAveragely`, when users needs to use their own `AllocateMessageQueueStrategy`, and they upgrade the client1 , and some mq will be missing to allocate or some mq allocate to multiple client instances, which will result in message duplication or message accumulation that fail to be consumed



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