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Kafka Interview Questions — What Senior Engineers Need to Know

Apache Kafka has become the backbone of event-driven architectures at most large companies. Interview questions about Kafka go beyond “what is a topic” — interviewers want to understand how you reason about partitioning strategies, consumer group rebalancing, and the guarantees Kafka actually provides.

These 11 questions cover what senior engineers need to know: how Kafka achieves high throughput, what exactly-once semantics really means, how replication works under the hood, and the operational trade-offs of different configurations. Essential knowledge for anyone building or maintaining event-driven systems.

All 11 Questions

Kafka — acks=0/1/allWhat do acks=0, acks=1, and acks=all mean in Kafka?Kafka — Why Is It FastWhy is Kafka fast?Kafka — Consumer LagWhat is Kafka consumer lag and how do you monitor it?Kafka — ISRWhat is the ISR (In-Sync Replicas) in Kafka?Kafka — Consumer GroupHow do Kafka consumer groups work?Kafka — RebalanceWhat is a Kafka consumer group rebalance?Kafka — min.insync.replicasWhat does min.insync.replicas control in Kafka?Kafka — auto.offset.resetWhat does auto.offset.reset do in Kafka?Kafka — enable.auto.commit DangersWhat are the dangers of enable.auto.commit in Kafka?Kafka — Idempotent ProducerWhat is a Kafka idempotent producer and why does it matter?Kafka — Topic, Partition, OffsetExplain Kafka topics, partitions, and offsets.

How to Prepare

Focus on understanding concepts deeply enough to explain them in your own words. For each topic, practice articulating the trade-offs and real-world applications — interviewers care about practical judgment, not textbook definitions.

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