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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

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

2. (You are writing lightweight XML messages to a Kafka topic named userinfo.
Which format should you use for the value field?)

A) ByteSerializer
B) VoidSerializer
C) StringSerializer
D) XmlSerializer

3. You have a consumer group with default configuration settings reading messages from your Kafka cluster.
You need to optimize throughput so the consumer group processes more messages in the same amount of time.
Which change should you make?

A) Remove some consumers from the consumer group.
B) Decrease the session timeout of each consumer.
C) Disable auto commit and have the consumers manually commit offsets.
D) Increase the number of bytes the consumers read with each fetch request.

4. Which two statements are correct when assigning partitions to the consumers in a consumer group using the assign() API?
(Select two.)

A) The consumer chooses which partition to read without any assignment from brokers.
B) It is mandatory to subscribe to a topic before calling assign() to assign partitions.
C) The consumer group will not be rebalanced if a consumer leaves the group.
D) All topics must have the same number of partitions to use assign() API.

5. Which statement describes the storage location for a sink connector's offsets?

A) In memory which is then periodically flushed to a RocksDB instance
B) The __consumer_offsets topic, like any other consumer
C) The topic specified in the offsets.storage.topic configuration parameter
D) In a file specified by the offset.storage.file.filename configuration parameter

Solutions: