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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. You are composing a REST request to create a new connector in a running Connect cluster. You invoke POST /connectors with a configuration and receive a 409 (Conflict) response.
What are two reasons for this response? (Select two.)

A) The connect cluster has reached capacity, and new connectors cannot be created without expanding the cluster.
B) The Connect cluster is in process of rebalancing.
C) The connector configuration was invalid, and the response body will expand on the configuration error.
D) The Connector already exists in the cluster.

2. You have a Kafka Connect cluster with multiple connectors.
One connector is not working as expected.
How can you find logs related to that specific connector?

A) Make no change, there is no way to find logs other than by stopping all the other connectors.
B) Change the log level to DEBUG to have connector context information in logs.
C) Modify the log4j.properties file to add a dedicated log appender for the connector.
D) Modify the log4j.properties file to enable connector context.

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

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

5. You have a topic with four partitions. The application reads from it using two consumers in a single consumer group.
Processing is CPU-bound, and lag is increasing.
What should you do?

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

Solutions: