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https://issues.apache.org/jira/browse/ROCKETMQ-214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16108822#comment-16108822
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ASF GitHub Bot commented on ROCKETMQ-214:
-----------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/incubator-rocketmq/pull/122
> Improvement to help client to switch balance strategy smoothly
> --------------------------------------------------------------
>
> 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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