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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

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

2. (You need to set alerts on key broker metrics to trigger notifications when a Kafka cluster is unhealthy.
What are three minimum broker metrics to monitor for cluster health?
Select three.)

A) kafka.controller:type=KafkaController,name=TopicsToDeleteCount
B) kafka.controller:type=KafkaController,name=LastCommittedRecordOffset
C) kafka.controller:type=KafkaController,name=OfflinePartitionsCount
D) kafka.controller:type=KafkaController,name=ActiveControllerCount
E) kafka.controller:type=ControllerStats,name=UncleanLeaderElectionsPerSec

3. (You are developing a Kafka Streams application with a complex topology that has multiple sources, processors, sinks, and sub-topologies.
You are working in a development environment and do not have access to a real Kafka cluster or topics.
You need to perform unit testing on your Kafka Streams application.
Which should you use?)

A) MockProducer, MockConsumer
B) TestProducer, TestConsumer
C) TopologyTestDriver
D) KafkaUnitTestDriver

4. (You are developing a Java application that includes a Kafka consumer.
You need to integrate Kafka client logs with your own application logs.
Your application is using the Log4j2 logging framework.
Which Java library dependency must you include in your project?)

A) Just the Log4j2 dependency of the application
B) None, the correct dependency will be added transitively by the Kafka client
C) SLF4J implementation for Log4j 1.2 (org.slf4j:slf4j-log4j12)
D) SLF4J implementation for Log4j2 (org.apache.logging.log4j:log4j-slf4j-impl)

5. (You started a new Kafka Connect worker.
Which configuration identifies the Kafka Connect cluster that your worker will join?)

A) worker.id
B) group.id
C) connector.id
D) cluster.id

Solutions: