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How to avoid duplicates?

How to make sure data in cache and data in database are consistent as up-to-date as possible.

Bounded vs Unbounded queues

To prevent crashing, every queue in the broker memory should have a limited size since a broker can have many queue.

Storing messages in memory: pros: fast cons: limited memory space (drop messages vs storing them in disk), low durability guarantee (when service crashes, messages are lost)