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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