René Cordier created JAMES-3996:
-----------------------------------
Summary: POC: Move RabbitMQ Event bus notifications to Redis?
Key: JAMES-3996
URL: https://issues.apache.org/jira/browse/JAMES-3996
Project: James Server
Issue Type: Improvement
Reporter: René Cordier
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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