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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (You are experiencing low throughput from a Java producer.
Kafka producer metrics show a low I/O thread ratio and low I/O thread wait ratio.
What is the most likely cause of the slow producer performance?)

A) Compression is enabled.
B) The producer is sending large batches of messages.
C) The producer code has an expensive callback function.
D) There is a bad data link layer (Layer 2) connection from the producer to the cluster.

2. (You have a Kafka consumer in production actively reading from a critical topic from which multiple other applications are consuming.
You have a new requirement to update the offset of your consumer to start reading from the beginning of the topic.
Which action would you take?)

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

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

4. (You create a topic with five partitions.
What can you assume about messages read from that topic by a single consumer group?)

A) Messages from one partition can be consumed by any of the consumers in a group for faster processing.
B) The consumer group can only read the same number of messages from all the partitions.
C) Messages can be consumed by a maximum of five consumers in the same consumer group.
D) All messages will be read from exactly one broker by the consumer group.

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

Solutions: