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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (You have a topic with four partitions. The application reading this topic is using a consumer group with two consumers.
Throughput is smoothly distributed among partitions, but application lag is increasing.
Application monitoring shows that message processing is consuming all available CPU resources.
Which action should you take to resolve this issue?)

A) Increase the max.poll.records property of consumers.
B) Decrease the max.poll.records property of consumers.
C) Add more consumers to increase the level of parallelism of the processing.
D) Add more partitions to the topic to increase the level of parallelism of the processing.

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

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

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

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

5. (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) All messages will be read from exactly one broker by the consumer group.
C) Messages can be consumed by a maximum of five consumers in the same consumer group.
D) The consumer group can only read the same number of messages from all the partitions.

Solutions: