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Watch for
Partitions reassigning when the second consumer joins, and lag (log-end minus committed offset) shrinking as each group catches up.
More about this scenario
You'll learn
How a partitioned log scales consumers while preserving per-key order, and how committed offsets let groups read independently.
How it runs
Each PRODUCE hashes its key to a partition. Consumers JOIN a group and get partitions assigned round-robin; adding a consumer rebalances the assignment. Each group's committed offsets advance on POLL, independently of other groups.