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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. (You have a Kafka consumer in production actively reading from a critical topic from which multiple other applications are consuming.
You have a new requirement to update the offset of your consumer to start reading from the beginning of the topic.
Which action would you take?)

A) Temporarily configure the topic's retention.ms parameter to 0 to empty the topic.
B) Update the consumer group's offset to the earliest position using the kafka-consumer-groups CLI tool.
C) Start a new consumer application with the same consumer group id.
D) Update the consumer configuration by setting the auto.offset.reset property to earliest.

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

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

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

4. (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) TopologyTestDriver
B) TestProducer, TestConsumer
C) MockProducer, MockConsumer
D) KafkaUnitTestDriver

5. What are two examples of performance metrics?
(Select two.)

A) fetch-rate
B) incoming-byte-rate
C) Number of active user sessions
D) Number of active users
E) total-login-attempts
F) Time of last failed login

Solutions: