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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. Which configuration allows more time for the consumer poll to process records?

A) fetch.max.wait.ms
B) max.poll.interval.ms
C) session.timeout.ms
D) heartbeat.interval.ms

2. (You are writing lightweight XML messages to a Kafka topic named userinfo.
Which format should you use for the value field?)

A) ByteSerializer
B) StringSerializer
C) VoidSerializer
D) XmlSerializer

3. Your application is consuming from a topic with one consumer group.
The number of running consumers is equal to the number of partitions.
Application logs show that some consumers are leaving the consumer group during peak time, triggering a rebalance. You also notice that your application is processing many duplicates.
You need to stop consumers from leaving the consumer group.
What should you do?

A) Increase session.timeout.ms property.
B) Add more consumer instances.
C) Reduce max.poll.records property.
D) Split consumers in different consumer groups.

4. What is the default maximum size of a message the Apache Kafka broker can accept?

A) 10MB
B) 2MB
C) 5MB
D) 1MB

5. (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) Use a callback argument in producer.send() where you check delivery status.
B) Check the value of ProducerRecord.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.

Solutions: