It really depends on what you're doing. If you're doing something where the people you're storing data about don't need to interact with each other, you can act

It really depends on what you're doing. If you're doing something where the people you're storing data about don't need to interact with each other, you can actually store each user's events in a separate event log. This can be fed to more transient event queues which do not have an indefinite retention period where interaction is required. Not sure about how well-geared Kafka is to this scenario though.