Kafka Share Groups (Queues for Kafka) Explained

In this chapter

Share groups: for work that doesn’t need order

What breaks

Push workers: 3 partitions, a 4th worker idle. A share group could help, but where must you not use one?

Three ways to respond

• Use a share group for the trip lifecycle: Order is lost. Steps can run out of sequence.
• Consumer group for ordered work, share group for pushes: Each push stands alone, so any worker can take it. (the fix)
• Just add a 4th partition: Fine for ordered work, but not the point here.

The fix: Consumer group for ordered work, share group for pushes

Share groups (Kafka 4, KIP-932) let many workers read one partition with per-record acks, like a queue. They don’t keep order.

Remember: Need order → consumer group. Don’t → share group.

More on Advanced problems

• Kafka Exactly-Once Semantics: Where It Ends
• Kafka Consumer Group Rebalancing Without Pauses

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