Java Spring libraries for Distributed Cache

[south tiger]

Hi!
Could anyone suggest libraries compatible with Java Spring for this use-case?

Basically, I want a distributed systems library which provides a data structure whose elements can be evenly split across processes, and provides listeners which trigger when ownership changes

I've been having some issues with Hazelcast here: https://stackoverflow.com/questions/76328326/how-to-listen-for-repartition-and-restoring-from-backup-events-on-my-hazelcast-d
and I'm wondering if there's another alternative library I could use instead.

• My application needs to subscribe to a large number of "topics" via a pub-sub message service.
• When multiple instances of my application are running, I want them to split the "topics" evenly among them, and subscribe/unsubscribe from the topics such that all topics are subscribed to by exactly 1 instance at a given time.

E.g:

1. Instance 1 starts, subscribes to all the keys
2. Instance 2 starts and subscribes to half of the keys, instance 1 unsubscribes from these same keys.
3. Instance 1 goes down. Instance 2 subscribes to all the keys which instance 1 had.

[whole oyster]

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[whole oyster]

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[tough trellis]

This sounds like you're trying to do Client-Side Loadbalancing, which is not super effective. I'd swap to a Message Broker and let it push all the messages out. So you can have 3 instances subscribed to the same topic, but only one will get the message.