CCDAK Questions and Answers: Confluent Certified Developer for Apache Kafka Certification Examination & CCDAK Practice Test

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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions (Q194-Q199):

NEW QUESTION # 194
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. Increase 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. Decrease the max.poll.records property of consumers.

Answer: B

Explanation:
If the application isCPU-boundandlagging, addingmore consumersto the group will allow betterparallel processing, especially since the topic has4 partitions, allowing up to 4 active consumers.
FromKafka Consumer Group Docs:
"Kafka achieves parallelism by distributing partitions across consumers in a group. Adding consumers helps reduce lag if partitions are underutilized."
* B may help but requires repartitioning and coordination.
* C or D affects how much data is polled, not how fast it's processed.
Reference:Kafka Consumer Concepts > Parallelism and Scaling

NEW QUESTION # 195
In Kafka, what are Topics split into?

A. Chunks
B. Partitions
C. Sub Topics
D. Consumers

Answer: B

NEW QUESTION # 196
The kafka-console-consumer CLI, when used with the default options

A. uses a random group id
B. always uses the same group id
C. does not use a group id

Answer: A

Explanation:
If a group is not specified, the kafka-console-consumer generates a random consumer group.

NEW QUESTION # 197
What does producing data to a topic with a message key allow?

A. Producers to add extra metadata with the message
B. Messages to be secured with encryption
C. Consumers to subscribe to a message with a specific key
D. Messages to have a strategy for partition assignment

Answer: D

NEW QUESTION # 198
When is the onCompletion() method called?
private class ProducerCallback implements Callback {
@Override
public void onCompletion(RecordMetadata recordMetadata, Exception e) {
if (e != null) {
e.printStackTrace();
}
}
}
ProducerRecord<String, String> record =
new ProducerRecord<>("topic1", "key1", "value1");
producer.send(record, new ProducerCallback());

A. When the broker response is received
B. When message is serialized successfully
C. When send() method is called
D. When the message is partitioned and batched successfully

Answer: A

Explanation:
Callback is invoked when a broker response is received.

NEW QUESTION # 199
......

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