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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (ROCKETMQ-214) Improvement to help client to switch balance strategy smoothly
Date Sat, 01 Jul 2017 12:20:02 GMT


ASF GitHub Bot commented on ROCKETMQ-214:

Github user lqjack commented on the issue:

> Improvement to help client to switch balance strategy smoothly
> --------------------------------------------------------------
>                 Key: ROCKETMQ-214
>                 URL:
>             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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