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https://issues.apache.org/jira/browse/ROCKETMQ-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389890#comment-16389890
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Sohaib Iftikhar commented on ROCKETMQ-124:
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Just adding the link to the [design
doc|https://docs.google.com/document/d/1KSpXGNDH0HF5E27lfKJxJnjIjPtlP1Q-M6rj3yZde24]
here to sync up with the dev discussion. Also helps with more reviews/feedback
on it.
> Support non-redundant message delivery mechanism
> ------------------------------------------------
>
> Key: ROCKETMQ-124
> URL: https://issues.apache.org/jira/browse/ROCKETMQ-124
> Project: Apache RocketMQ
> Issue Type: Wish
> Components: rocketmq-broker, rocketmq-client, rocketmq-store
> Reporter: yukon
> Priority: Minor
> Labels: gsoc2018
>
> The duplicated messages are worrisome. It will cost much if the user needs
> non-repeating messages.
> In most cases, the user need store the consumer records to judge a message is
> replicated or not, and the store stage should guarantee strong consistency.
> As you see, it's very complicated, so support a strict and non-redundant
> message delivery mechanism is impending.
> In this context, we hope to design a delivery once plugin, say, you could
> design a global(but need raft guarantee multi-copy data) storage, using the
> hooker of RocketMQ ConsumeMessageHook to finish the task.
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