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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You use Kafka Connect with the JDBC source connector to extract data from a large database and push it into Kafka.
The database contains tens of tables, and the current connector is unable to process the data fast enough.
You add more Kafka Connect workers, but throughput doesn't improve.
What should you do next?

A) Increase the value of the connector's property tasks.max.
B) Modify the database schemas to enable horizontal sharding.
C) Increase the number of Kafka partitions for the topics.
D) Add more Kafka brokers to the cluster.

2. (You are writing a producer application and need to ensure proper delivery.
You configure the producer with acks=all.
Which two actions should you take to ensure proper error handling?
Select two.)

A) Check the value of ProducerRecord.status().
B) Use a callback argument in producer.send() where you check delivery status.
C) Check that producer.send() returned a RecordMetadata object and is not null.
D) Surround the call to producer.send() with a try/catch block to catch KafkaException.

3. A stream processing application is consuming from a topic with five partitions. You run three instances of the application. Each instance has num.stream.threads=5.
You need to identify the number of stream tasks that will be created and how many will actively consume messages from the input topic.

A) 5 created, 5 actively consuming
B) 15 created, 5 actively consuming
C) 15 created, 15 actively consuming
D) 5 created, 1 actively consuming

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

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

5. (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

Solutions: