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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. A consumer wants to read messages from partitions 0 and 1 of a topic topic1. Code snippet is shown below.
consumer.subscribe(Arrays.asList("topic1"));
List<TopicPartition> pc = new ArrayList<>();
pc.add(new PartitionTopic("topic1", 0));
pc.add(new PartitionTopic("topic1", 1));
consumer.assign(pc);

A) Throws IllegalStateException
B) This works fine. subscribe() will subscribe to the topic and assign() will assign partitions to the consumer.

2. A producer application was sending messages to a partition with a replication factor of 2 by connecting to Broker 1 that was hosting partition leader. If the Broker 1 goes down, what will happen?

A) The producer will stop working
B) The producer will automatically produce to the broker that has been elected leader
C) The topic will be unavailable

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

4. Match the topic configuration setting with the reason the setting affects topic durability.
(You are given settings like unclean.leader.election.enable=false, replication.factor, min.insync.replicas=2)

5. Which of the following Kafka Streams operators are stateless? (select all that apply)

A) groupBy
B) flatmap
C) map
D) filter
E) branch
F) aggregate

Solutions: