Grokking Kafka and Event-Driven Architecture
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Activity Feed: Keys and Hot Accounts

The output below comes from a run against a single Kafka 4.4 broker. A program published 2,001 activities to activity-events, keyed by author: two each from 1,000 ordinary members with 150 followers each, and one release from proj-lumen, which has 240,000 followers. It also wrote every resulting feed entry to feed-updates, keyed by follower.

Output:

activity-events, keyed by author, 6 partitions
partition 0: 338 activities, 50,700 feed writes
partition 1: 309 activities, 286,200 feed writes  <- includes proj-lumen
partition 2: 328 activities, 49,200 feed writes

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