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https://issues.apache.org/jira/browse/COMDEV-252?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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yukon closed COMDEV-252.
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Resolution: Duplicate
> [RocketMQ] Support Global Ordered Messaging
> -------------------------------------------
>
> Key: COMDEV-252
> URL: https://issues.apache.org/jira/browse/COMDEV-252
> Project: Community Development
> Issue Type: Improvement
> Reporter: yukon
> Priority: Major
>
> A single memory queue is easy to support FIFO(first in, first out) semantic,
> inspired by that, many messaging systems support ordered messaging in a
> storage queue/partition.
> Ordered Messaging is designed to enhance messaging between applications when
> the order of operations and events is critical, for example:
> * The chat messages should be displayed orderly in the same chat channel.
> * Execute the concurrent modifications in the right order, like product
> price.
> * The operations of the same user should be executed orderly in the
> electricity system.
> As described earlier, it's easy to support ordered messaging in a single
> queue/partition, the producer can send a kind of messages to the fixed
> partition with a sharding key. But this solution doesn't have a good
> scalability and has hot-pot issue obviously.
>
> To resolve this issue, we need a global ordered messaging mechanism to have a
> good scalability without hot-pot issue.
> A practical proposal is that sending messages to distributed queue/partition
> with an ordered key. Messages are ordered in the same queue, then implement
> an OrderConsumer to pull messages from these queues then perform merge sort,
> finally deliver these ordered messages to users.
>
>
> dd
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