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https://issues.apache.org/jira/browse/ROCKETMQ-248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16101439#comment-16101439
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Yu Kaiyuan commented on ROCKETMQ-248:
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[~Jaskey]
I think the usage of `consumeFromWhere ` is to let the consumers determine
where they wants to start consuming from.
And the behavior of the option should match the expectation.
In the very situation of a new scaled queue of an *existing topic & existing
subscription*,
consumer should apparently consume from the beginning of the new scaled queue
to avoid message loss.
And the patch already takes it into consideration.
> ConsumeFromWhere does not always work as expected
> -------------------------------------------------
>
> Key: ROCKETMQ-248
> URL: https://issues.apache.org/jira/browse/ROCKETMQ-248
> Project: Apache RocketMQ
> Issue Type: Improvement
> Components: rocketmq-broker, rocketmq-client
> Affects Versions: 4.0.0-incubating, 4.1.0-incubating
> Reporter: Yu Kaiyuan
> Assignee: yukon
>
> As a *brand new subscription*, consumer will be allowed to decide where to
> start the consumption. And the options includes:
> * CONSUME_FROM_LAST_OFFSET
> * CONSUME_FROM_FIRST_OFFSET
> * CONSUME_FROM_TIMESTAMP
> But the fact is the option: `CONSUME_FROM_LAST_OFFSET` does not always work
> as expected. Even if the subscription is new, the consumer still might
> consume from the first message.
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