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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You are working on a Kafka cluster with three nodes. You create a topic named orders with:
replication.factor = 3
min.insync.replicas = 2
acks = allWhat exception will be generated if two brokers are down due to network delay?

A) NotEnoughReplicasException
B) NotLeaderForPartitionException
C) NotCoordinatorException
D) NetworkException

2. You need to explain the best reason to implement the consumer callback interface ConsumerRebalanceListener prior to a Consumer Group Rebalance.
Which statement is correct?

A) Previous log files are deleted.
B) Offsets are compacted.
C) Partitions assigned to a consumer may change.
D) Partition leaders may change.

3. Your application is consuming from a topic with one consumer group.
The number of running consumers is equal to the number of partitions.
Application logs show that some consumers are leaving the consumer group during peak time, triggering a rebalance. You also notice that your application is processing many duplicates.
You need to stop consumers from leaving the consumer group.
What should you do?

A) Add more consumer instances.
B) Reduce max.poll.records property.
C) Increase session.timeout.ms property.
D) Split consumers in different consumer groups.

4. What is a consequence of increasing the number of partitions in an existing Kafka topic?

A) Records with the same key could be located in different partitions.
B) Existing data will be redistributed across the new number of partitions temporarily increasing cluster load.
C) The acknowledgment process will increase latency for producers using acks=all.
D) Consumers will need to process data from more partitions which will significantly increase consumer lag.

5. Which configuration allows more time for the consumer poll to process records?

A) heartbeat.interval.ms
B) fetch.max.wait.ms
C) session.timeout.ms
D) max.poll.interval.ms

Solutions: