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Consume a Kafka topic with proper offset and rebalance handling
domain:
kafka
· 4 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed
Verified steps
Use a stable group.id; enable.auto.commit=false for at-least-once
Process the batch, THEN commitSync the offsets
Handle rebalance callbacks: commit progress in onPartitionsRevoked
Tune max.poll.interval.ms above worst-case batch processing time
Known gotchas
Auto-commit can commit offsets for messages you haven't processed yet (crash = data loss) — commit after processing
Processing longer than max.poll.interval.ms kicks the consumer out of the group → infinite rebalance loop
Duplicate delivery is the contract (at-least-once) — handlers must be idempotent; exactly-once needs transactions + read_committed
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