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https://issues.apache.org/jira/browse/JAMES-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17851634#comment-17851634
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Benoit Tellier commented on JAMES-3996:
---------------------------------------
For the record this is the mailing list thread:
https://www.mail-archive.com/server-dev@james.apache.org/msg73913.html
This POC was conclusive, Linagora is yet to be contributing this as an option
to the ASF.
> POC: Move RabbitMQ Event bus user notifications to Redis?
> ---------------------------------------------------------
>
> Key: JAMES-3996
> URL: https://issues.apache.org/jira/browse/JAMES-3996
> Project: James Server
> Issue Type: Improvement
> Reporter: René Cordier
> Priority: Major
>
> In a setup with a RabbitMQ cluster, and quorum queues, we observed that if
> Cassandra was unavailable for some reason, heavy nacks causing very high
> absurd traffic with heavy memory usage, creating overall issues with the
> event bus in general.
> Here the goal would be to investigate if it's possible to use Redis instead
> of RabbitMQ for delegating the user notifications. Might use Redis pub-sub or
> streams to achieve this, by registering the event listeners on Redis instead
> of RabbitMQ.
> Concerned code on RabbitMQ event bus:
> {code:java}
> default Publisher<Registration> register(EventListener listener,
> RegistrationKey key) \{
> return register(EventListener.wrapReactive(listener), key);
> }
> Publisher<Registration> register(EventListener.ReactiveEventListener
> listener, RegistrationKey key);
> default Publisher<Registration>
> register(EventListener.ReactiveEventListener listener,
> Collection<RegistrationKey> keys) \{
> return Flux.fromIterable(keys)
> .concatMap(key -> register(listener, key))
> .reduce((reg1, reg2) -> () -> Flux.merge(reg1.unregister(),
> reg2.unregister()))
> .map(unRegistrationWithMergedFlux -> () ->
> Mono.from(Flux.from(unRegistrationWithMergedFlux.unregister())
> .then()));
> }
> {code}
> It's just a POC to see first if it's achievable or not, with performance
> tests. If results are positive, we might envisage to integrate it in a
> cleaner way.
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