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https://issues.apache.org/jira/browse/ROCKETMQ-122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16362025#comment-16362025
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yukon commented on ROCKETMQ-122:
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Hi [~anandkanav92], thanks for your attention, you can attack
[yu...@apache.org|mailto:yu...@apache.org] [or
vongosl...@apache.org|mailto:or%c2%a0vongosl...@apache.org] for more details.
> Support Global Ordered Messaging
> --------------------------------
>
> Key: ROCKETMQ-122
> URL: https://issues.apache.org/jira/browse/ROCKETMQ-122
> Project: Apache RocketMQ
> Issue Type: Wish
> Components: rocketmq-broker, rocketmq-client, rocketmq-store
> Reporter: yukon
> Priority: Minor
> Labels: gsoc2018
> Fix For: 5.0.0
>
>
> 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.
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