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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (What are two stateless operations in the Kafka Streams API?
Select two.)

A) Join
B) Filter
C) GroupBy
D) Reduce

2. An application is consuming messages from Kafka.
The application logs show that partitions are frequently being reassigned within the consumer group.
Which two factors may be contributing to this?
(Select two.)

A) There is a storage issue on the broker.
B) An instance of the application is crashing and being restarted.
C) There is a slow consumer processing application.
D) The number of partitions does not match the number of application instances.

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

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

4. You have a Kafka consumer in production actively reading from a critical topic.
You need to update the offset of your consumer to start reading from the beginning of the topic.
Which action should you take?

A) Update the consumer group's offset to the earliest position using the kafka-consumer-groups CLI tool.
B) Temporarily configure the topic's retention.ms parameter to 0 to empty the topic.
C) Update the consumer configuration by setting auto.offset.reset=earliest.
D) Start a new consumer application with the same consumer group id.

5. You have a Kafka client application that has real-time processing requirements.
Which Kafka metric should you monitor?

A) Consumer lag between brokers and consumers
B) Consumer heartbeat rate to group coordinator
C) Aggregate incoming byte rate
D) Total time to serve requests to replica followers

Solutions: