Grokking Kafka and Event-Driven Architecture
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Activity Feed: Events and Fan Out

At 14:05 Priya publishes a post about profiling a slow database query, and 150 members follow her. One of them, Daniel, opens his feed at 14:20. There are two ways for the post to reach his screen, and both show him exactly the same list.

In the first design, the post is copied into all 150 followers' feeds within a minute of being published. When Daniel opens his feed, the feed service reads one stored list. In the second design, nothing is copied when Priya publishes

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